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ลำดับ ชื่อบทความ ชื่อบทความภาษาอังกฤษ บทคัดย่อ ผู้ตีพิมพ์ กลุ่ม/รูปแบบการนำเสนอ ระดับ รายละเอียด
1 Synthesis and cytotoxic activity of azanaphoquinone annelated pyrrole derivatives Synthesis and Cytotoxic Activity of Azanaphthoquinone Annelated Pyrrole Derivatives

Azanaphthoquinone annelated pyrroles have been developed from the natural anticancer drug, mitoxantrone to reduce cardiotoxic side-effects. This paper reports the synthesis of azanaphthoquinone annelated pyrrole derivatives as cytostatic compounds. The synthetic pathway was started from the commercially-available 5-hydroxyisoquinoline via a three step reaction to obtain 1H-pyrrolo[3,2-g]isoquinoline-4,9-dione. N-Alkylation of nitrogen atom in pyrrole ring was carried out under basic conditions with different side chains to obtain mono-substituted azanaphthoquinone annelated pyrroles (2a-e) with 2 to 3-carbon side chains in moderate to good yields. The hydrazone and thiosemicarbazone derivatives were synthesized by a condensation reaction of mono-substituted products 2 with hydrazine and thiosemicarbazide respectively. The reactions occurred regio-selectively at C-4 to give hydrazones (3a-e) and thiosemicarbazones (4a-e) respectively. The synthesized compounds were purified by column chromatography and characterized by spectroscopic techniques, including 1H NMR, 13C NMR, IR, UV and LC-MS. The antiproliferative activity of the synthesized compounds was evaluated on cervical carcinoma: KB/HeLa by using xCELLigence from Roche. The results showed that the mono-substituted products with 2-carbon side chain (2b) exhibited the highest activity with IC50 value of 0.008 M. The mono-substituted product 2 showed higher inhibition in comparison to hydrazone and thiosemicarbazone derivatives. These results lead to the optimization of the target molecules in further works. 

นิภาวรรณ พองพรหม TCI กลุ่ม 2 ชาติ
    วันที่ตีพิมพ์
  • 2017-09-01
    ชื่อวารสาร
  • วารสารวิทยาศาสตร์และเทคโนโลยี มหาวิทยาลัยอุบลราชธานี
    DOI
2 ชุดการทดลองเคมีแบบย่อส่วนต้นทุนต่ำเพื่อสนับสนุนความเข้าใจมโนมติ เรื่อง สมดุลเคมี สำหรับนักเรียนระดับมัธยมศึกษาปีที่ 5 0

The main purpose of this research was to develop low-cost small-scale chemistry experimental kit on chemical equilibrium, and then investigate students’ conceptual understanding from learning with the developed kit. The samples were 37 of 11-grade students studying in a large-size high school in Ubon Ratchathani. The data collecting tools included a two-tier diagnostic test and a survey of students’ attitudes and experiences towards chemistry subject. The implementation of the small-scale experimental kit through 5E-inquiry cycle resulted that students’ averaged percentages for each of the pretest, posttest and retentiontest were 20.48,60.64and59.60, respectively, in which the normalized gain was in the medium level. The dependent samples t-test analysis indicated that their posttest scores were statistically higher than those of pretest scores, but not statistically different from the retention-test scores at the 95% significance level. After the intervention, the total percentage of students in the partial and sound conceptual understanding (PU+SU) categories was increased by 51.48, while the total percentage of students in the mis- and no-conceptual understanding (MU+NU) decreased by51.89. In addition, theirpost-attitudes and experiences towards chemistry subject were statistically higher than those before learning using the kit. This verified that the intervention of low-cost small-scale chemistry experimental kit was the effective tool for promoting students to change to the more correct conceptual understanding and to the more positive attitudes and experiences towards chemistry.

ศักดิ์ศรี สุภาษร TCI กลุ่ม 1 ชาติ
    วันที่ตีพิมพ์
  • 2017-07-01
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  • วารสารหน่วยวิจัยวิทยาศาสตร์ เทคโนโลยี และสิ่งแวดล้อมเพื่อการเรียนรู้
    DOI
3 การสร้างเซลล์กัลวานิกอย่างง่ายที่ทําจากเส้นด้ายเพื่อศึกษาไฟฟ้าเคมี Fabricationof Simple Galvanic Cells Using Cotton Thread to Investigate Electrochemistry

The main purpose of this research article was to fabricate simple galvanic cellsusing cotton thread. This device contains various metal strips (Cu, Ag, Zn, Pb, Sn, Fe, Al and Mg), metal solutions, and potassium nitrate solution serving as electrodes, metal ions, and electrolyte, respectively. In this article, cotton thread is not only used to be a support for reactions between each half-cell, but also a salt bridge for electrolyte. The results showed that the observed cell potentials, Ecell (Obsd) were slightly different from the theoretical cell potentials, Ecell (Theor), calculated from the Nernst equation. This device also can be used to investigate the effect of concentrations on the electromotive force (emf). This device can be applied as a teaching tool of electrochemistry for students at the secondary school level because of an easy way to fabricate galvanic cells.

เสนอ ชัยรัมย์ TCI กลุ่ม 1 ชาติ
    วันที่ตีพิมพ์
  • 2017-07-01
    ชื่อวารสาร
  • วารสารหน่วยวิจัยวิทยาศาสตร์ เทคโนโลยี และสิ่งแวดล้อมเพื่อการเรียนรู้
    DOI
4 การใช้กระติกน้ำสุญญากาศเป็นแคลอริมิเตอร์อย่างง่าย เพื่อหามวลโมเลกุลของสารประกอบจากสมบัติคอลลิเกตีฟ Using vacuum flask as a simple calorimeter for determination of molecular weight of compounds from colligative properties

This research aimed to develop an experimental demonstration in the laboratory to determine the molecular weight of compound from freezing point depression by using a vacuum flask as a simple calorimeter. Colligative properties depend on the number, not the identity of molecule be measuring. All the substances used in this study were environmental-friendly: water was used as a solvent, while allsolutes were rock salt, monosodium glutamate and sugar. In experiment, the solvent or solution was placed in a vial with a thermometer, put into a vacuum flask containing sprinkle rock salt on the ice, and then record the decreasing temperature every minute. The relationship between the temperature and time was plotted to determine the freezing point of the solvent (T) or solution (Tf ). Furthermore, this approach was applied to determine the molecular weight of compound  in red or yellow food color. The calculated molecular weight of all solutes was closed to the actual value. The percentage error of rock salt, monosodium glutamate, sugar, red food colour and yellow food colour was 0.53%, 1.12%, 1.86%, 0.31%, and 0.11% respectively. This experimental demonstration ought to be interesting to science teachers for the instruction of colligative properties at all levels in laboratory.             

เสนอ ชัยรัมย์ TCI กลุ่ม 2 ชาติ
    วันที่ตีพิมพ์
  • 2017-05-01
    ชื่อวารสาร
  • วารสารวิทยาศาสตร์และเทคโนโลยี มหาวิทยาลัยอุบลราชธานี
    DOI
5 Development of corn waste for reuse as a catalyst สายสมร ลำลอง TCI กลุ่ม 1 ชาติ
    วันที่ตีพิมพ์
  • 2018-12-07
    ชื่อวารสาร
  • Global Society For Research And Development international conference
    DOI
6 ผลการจัดการเรียนรู้สะเต็มศึกษาของนักเรียนชั้นมัธยมศึกษาปีที่ 6 เรื่องไฟฟ้าเคมี กานต์ตะรัตน์ วุฒิเสลา TCI กลุ่ม 1 ชาติ
    วันที่ตีพิมพ์
  • 2018-12-06
    ชื่อวารสาร
  • การประชุมวิชาการระดับชาติ ครั้งที่ 15 มหาวิทยาลัยเกษตรศาสตร์วิทยาเขต กำแพงแสน
    DOI
7 Ready-to-Use Titanium Dioxide Slurry for Cosmetics Application Ready-to-Use Titanium Dioxide Slurry for Cosmetics Application

The objective of research was to prepare ready-to-use TiO2 in slurry form for easy use in cosmetics. Three types of TiO2 source were prepared as TiO2 slurry, namely commercial TiO2 (TiO2 -A and TiO2 -P25) and synthesized TiO2 (TiO2 -S) The suitable of solvents and amount of TiO2 , including optimum sonication time were studied. The experiments were set up as two groups of solvent, i.e. (1) six types of pure solvent and (2) nine types of mixed solvent. In order to achieve the best result of using solvent, 0.0075 g TiO2 powder was added to each of 15 mL solvent and sonicated for 10 minutes. The results showed that butylene glycol (BG) was the best of pure solvent, and mixture of propylene glycol (PG) and BG ratio 1:1 was the best of mixed solvent. Due to lower cost of PG than BG, PG mixed with BG was chose as the solvent for slurry preparation. The amount of TiO2was varied from 10-60% w/v of BG. Best slurry texture obtained using 60 %w/v of TiO2 . The study of sonication time was varied from 10-60 minutes. It was found that the optimum time was at 30 minutes. Texture and stability of prepared slurry were similar to commercial. Different sunscreen were formulated by containing prepared and commercial slurry separately and evaluated. There were no significant difference results between prepared slurry and commercial. In order to investigate the satisfaction of products, 40 volunteers were asked to use products for one week and answer in the questionnaires. The product containing prepared slurry was satisfied by 96% of volunteers, whereas the product containing commercial slurry was satisfied by 76% of volunteers. 

นุชนาพร พิจารณ์ TCI กลุ่ม 1 ชาติ
    วันที่ตีพิมพ์
  • 2019-01-01
    ชื่อวารสาร
  • The Journal of Industrial Technology Suan Sunandha Rajabhat University
    DOI


ระดับนานาชาติ 6qwCQR.png
ลำดับ ชื่อบทความ ชื่อบทความภาษาอังกฤษ บทคัดย่อ ผู้ตีพิมพ์ กลุ่ม/รูปแบบการนำเสนอ ระดับ รายละเอียด
1 A DFT study of volatile organic compounds adsorption on transition metal deposited graphene A DFT study of volatile organic compounds adsorption on transition metal deposited graphene

Recently, elevated global emission of volatile organic compounds (VOCs) was associated to the acceleration and increasing severity of climate change worldwide. In this work, we investigated the performance of VOCs removal via modified carbon-based adsorbent using density functional theory. Here, four transition metals (TMs) including Pd, Pt, Ag, and Au were deposited onto single-vacancy defective graphene (SDG) surface to increase the adsorption efficiency. Five prototypical VOCs including benzene, furan, pyrrole, pyridine, and thiophene were used to study the adsorption capability of metal-deposited graphene adsorbent. Calculation results revealed that Pd, Pt, Au, and Ag atoms and nanoclusters bind strongly onto
the SDG surface. In this study, benzene, furan and pyrrole bind in the
-interaction mode using delocalized -electron in aromatic ring, while pyridine and thiophene favor X- interaction mode, donating
lone pair electron from heteroatom. In terms of adsorption, pyridine VOC adsorption strengths to the TM-cluster doped SDG surfaces are Pt
4 (-2.11 eV) > Pd4 (-2.05 eV) > Ag4 (-1.53 eV) > Au4 (-1.87 eV). Our findings indicate that TM-doped SDG is a suitable adsorbent material for VOC removal. In addition, partial density of states analysis suggests that benzene, furan, and pyrrole interactions with TM cluster are based on p-orbitals of carbon atoms, while pyridine and thiophene interactions are facilitated by hybridized sp2-orbitals of heteroatoms. This work provides a key insight into the fundamentals of VOCs adsorption on carbon-based adsorbent.

ศิริพร จึงสุทธิวงษ์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2016-02-28
    ชื่อวารสาร
  • Applied Surface Science
    DOI
2 Preparation and characterization of modified telechelic natural rubber-based pressure-sensitive adhesive ศิริวัฒน์ ระดาบุตร Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2017-12-31
    ชื่อวารสาร
  • JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY
    DOI
3 Photoresponsive Nano-Coumarin with Indole Auxin Hormone รักเกียรติ จิตคติ Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2017-11-30
    ชื่อวารสาร
  • Defect and Diffusion Forum
    DOI
4 Non-Enzymatic Glucose Sensors for Sensitive Amperometric Detection Based on Simple Method of Nickel Nanoparticles Decorated on Magnetite Carbon Nanotubes Modified Glassy Carbon Electrode มะลิวรรณ อมตธงไชย Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2017-11-30
    ชื่อวารสาร
  • International Journal of Electrochemical Science
    DOI
5 The Influence of Silver Cluster Size and Carbon Nanotubes on CO Adsorption: A DFT Study ชาญ อินทร์แต้ม Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2017-11-01
    ชื่อวารสาร
  • วารสารวิทยาศาสตร์และเทคโนโลยี มหาวิทยาลัยอุบลราชธานี
    DOI
6 Structure based drug design of 4-aminoquinilone derivatives in DNA Gyrase B subunit for anti-tuberculosis agents using molecular dynamics simulations พรพรรณ พึ่งโพธิ์ Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2017-11-01
    ชื่อวารสาร
  • วารสารวิทยาศาสตร์และเทคโนโลยี มหาวิทยาลัยอุบลราชธานี
    DOI
7 Synthesis and properties biodegradable hydrogels based on cross-linked natural rubber and cassava starch ชัยวุฒิ วัดจัง Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2017-11-01
    ชื่อวารสาร
  • Journal of Elastomers and Plastics
    DOI
8 Push-Pull N-Annulated Perylene-Based Sensitizers for Dye-Sensitized Solar Cells: Theoretical Property Tuning by DFT/TDDFT Push-Pull N-Annulated Perylene-Based Sensitizers for Dye-Sensitized Solar Cells: Theoretical Property Tuning by DFT/TDDFT

We evaluate the effects of donor and p-linker moieties on power-conversion efficiency for a series of push-pull type, Nannulated perylene dyes for dye-sensitized solar cells. Triphenylamine and diphenylamine are used as electron donors. We investigate the structural, optical, and electronic properties of dyes by performing density functional theory (DFT) calculations at the B3LYP level, using the 6-311G(d,p) basis set. Electronic absorption wavelengths were investigated using time dependent DFT (TD-DFT) calculations on M062x/6-311G(d,p) in THF. Our calculated results reveal that the diphenylamine (DPA) donor provides a small dihedral angle between diphenylamine and the perylene core, resulting in a red-shifted absorption spectrum. Introduction of an O-methoxy substituent into diphenylamine improves its donor properties, red-shifts the absorption wavelength, and increases the dipole moment, indicating increased intramolecular charge transfer in the Omethoxy substituted dye. Incorporation of a C-C triple bond in linker extends the p-conjugation system and decreases the dihedral angle between N-annulated perylene and cyanoacrylic acid; the dye adopts a planar structure, causing a red-shift in the absorption spectrum. Our results demonstrate that use of computational design can to help the experimentalist for out looking future developments to identify push-pull perylene sensitizers for highly efficient solar cells.

ศิริพร จึงสุทธิวงษ์ Q2 นานาชาติ
    วันที่ตีพิมพ์
  • 2017-10-25
    ชื่อวารสาร
  • CHEMISTRYSELECT
    DOI
9 Gold nanoparticles stabilized by starch polymer and their use as catalyst in homocoupling of phenylboronic acid Gold nanoparticles stabilized by starch polymer and their use as catalyst in homocoupling of phenylboronic acid

In this study, gold nanoparticles (Au NPs) stabilized by a starch polymer have been successfully prepared and characterized via a number of techniques including X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), UV-visible spectroscopy (UV-vis), transmission electron microscopy (TEM), and dynamic light scattering (DLS) measurements. The catalytic activity of starch-stabilized Au NPs was also examined toward the homocoupling of phenylboronic acid in water using oxygen in air as oxidant at an ambient temperature (25 ± 1 °C). Several parameters including the catalyst loading, base equivalent (eq.), base type, and reaction time were studied. This study offers a simple, inexpensive and environmentally friendly procedure for the stabilization of colloidal gold catalysts using a hydroxyl-rich structure of starch polymer with a great promise through potential applications in related fields.

เสนอ ชัยรัมย์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2017-10-01
    ชื่อวารสาร
  • 0
10 Starch-supported gold nanoparticles and their use in 4-nitrophenol reduction Starch-supported gold nanoparticles and their use in 4-nitrophenol reduction

Gold nanoparticles (AuNPs) have been synthesized through a green synthesis method using mung bean starch (MBS) as both reducing and stabilizing agents. The chemical state was analyzed by X-ray photoelectron spectroscopy (XPS). The crystalline structures were characterized by X-ray diffraction (XRD). The thermal properties were measured by thermogravimetric analysis and differential thermal analysis (TGA/DTA). The surface morphology was investigated by scanning electron microscopy (SEM). In order to investigate the catalytic activity, the mung bean starch-supported AuNPs (MBS-AuNPs) was utilized as a heterogeneous catalyst in the reduction of 4-nitrophenol (4-NP) in the presence of sodium borohydride (NaBH4). The kinetic studies under the different experimental conditions were performed in order to determine the activation parameters from the Arrhenius and Eyring equations. It was found that the activation energy (Ea), activation enthalpy (DH# ) and activation entropy (DS# ) were calculated to be 47.42 kJ mol1 , 44.78 kJ mol1 and 261.49 kJ mol1 , respectively. In addition, the catalytic activity was 73% reduction after recycling at the end of the fifth use. This work offers a non-toxic procedure for the synthesis of nanoparticles using starch-rich polymers with a great promise toward other potential applications.

เสนอ ชัยรัมย์ Q2 นานาชาติ
    วันที่ตีพิมพ์
  • 2017-09-30
    ชื่อวารสาร
  • Journal of Saudi Chemical Society
    DOI
11 Influence of Pyrolytic Carbon Black Prepared from Waste Tires on Mechanical Properties of Natural Rubber Vulcanizates Influence of Pyrolytic Carbon Black Prepared from Waste Tires on Mechanical Properties of Natural Rubber Vulcanizates

This research aimed to investigate the possibility of pyrolytic carbon black (PCB) used as filler in natural rubber (NR) and its effect on Mooney viscosity, cure characteristics and mechanical properties compared with commercial carbon black (N774). The results revealed that Mooney viscosity, stiffness and heat build-up tended to increase with increasing both PCB and N774 loading, whereas elongation at break decreased. However, the maximum tensile and tear strengths appeared at the optimum filler loading for both PCB and N774. At similar filler content, PCB-filled NR compounds have higher cure time, heat build-up and thermal resistance. Nevertheless, they exhibited lower Mooney viscosity and mechanical properties compared to N774-filled NR. Finally, it can be concluded that PCB could be utilized as filler in NR compound to act as semi-reinforcing filler and was classified as a filler to reduce costs.

สราวุธ ประเสริฐศรี Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2017-08-23
    ชื่อวารสาร
  • Key Engineering Materials
12 Significant enhancement in the performance of porphyrin for dye-sensitized solar cells: aggregation control using chenodeoxycholic acid

In this work, a series of porphyrin-based sensitizers, coded as ZnTEP, ZnTTEP, and ZnTTTD in which different kinds of thienyl groups are used as the p-linker, have been designed and successfully synthesized. Their synthesis, photophysical and electrochemical properties, and theoretical DFT calculations, as well as their applications in dye-sensitized solar cells (DSSCs) are reported. The results showed that the power conversion efficiency (Z) increases in the order of 1.14, 2.15 and 3.51% for ZnTEP, ZnTTEP and ZnTTTD, respectively. A significant improvement in the Z value was achieved with ZnTTTD-based solar cells, which was approximately three times the magnitude when compared to the lowest ZnTEP-based solar cells. Moreover, the effects of chenodeoxycholic acid (CDCA) in a dye solution as a co-adsorbent on the photovoltaic performance of DSSCs were investigated. It was found that the coadsorption of CDCA can hinder the formation of dye aggregates and the improve electron injection yield and thus Jsc. The Z value for ZnTTTD with the CDCA co-sensitizer dramatically increases up to 6.51%. This understanding of p-linker and co-sensitizer effects on the performance of porphyrins will serve as a guideline for the design of future dye sensitizers for DSSCs.

ทินกร แก้วอินทร์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2017-06-14
    ชื่อวารสาร
  • NEW JOURNAL OF CHEMISTRY
    DOI
13 A spectroscopic study of indigo dye in aqueous solution: A combined experimental and TD-DFT study

This study reports UV–Visible spectra and electronic structures of indigo (IG) in aqueous solution using a combination of experimental and theoretical methods. In the visible region, the experimental absorption spectrum of the solution showed a broad peak with the longest wavelength of maximal absorption (λmax) value at 708 nm. For the theoretical method, a trans-IG monomer and a trans-IG bound with two water molecules (IG.2W) were optimized in the ground state using the B3LYP and B3LYP-D3 calculations with the 6-31 + G(d,p) basis set and the SCRF-CPCM model for taking solvent effect into account was also applied. Sequentially, the UV–Visible spectra and λmax of the optimized trans-IG and IG.2W models in the implicit water were simulated by the time-dependent density functional theory (TD-DFT) calculations. The TD-DFT methods including BLYP, B3LYP, PBE0, CAM-B3LYP, M06-2X, ωB97XD, LC-BLYP, and LC-ωPBE functionals without and with the D3 correction and the 6-31 + G(d,p) basis set were selected. The results pointed out that BLYP and BLYP-D3 were the best methods because they could reproduce the experimental λmax value of IG in aqueous solution. The predicted λmax values of IG.2W were almost equal to 708 nm (the experimental data), indicating that IG.2W could be responsible for optical properties of IG.

ศิริพร จึงสุทธิวงษ์ Q2 นานาชาติ
    วันที่ตีพิมพ์
  • 2018-12-01
    ชื่อวารสาร
  • JOURNAL OF LUMINESCENCE
14 การพัฒนาความเข้าใจมโนมติ เรื่อง การเขียนสูตรการเรียกชื่อและรูปร่างโมเลกุลของสารโคเวเลนต์ด้วยการเรียนรู้แบบสืบเสาะ 5 ขั้น ร่วมกับแบบจำลองเชิงกายภาพ สำหรับนักเรียนชั้นมัธยมศึกษาปีที่ 4 ศักดิ์ศรี สุภาษร Q2 นานาชาติ
    วันที่ตีพิมพ์
  • 2018-11-24
    ชื่อวารสาร
  • การประชุมวิชาการระดับชาติงานเกษตรแฟร์นนทรีอีสาน ครั้งที่ 6
    DOI
15 Development of interactive particulate-level visualization in chemistry by using augmented reality technology: Collision theory and chemical reaction rate ศักดิ์ศรี สุภาษร Q2 นานาชาติ
    วันที่ตีพิมพ์
  • 2018-11-18
    ชื่อวารสาร
  • Turkish Online Journal of Educational Technology
    DOI
16 การพัฒนาความเข้าใจมโนมติ เรื่อง การเกิดพันธะไอออนิก การเขียนสูตรและเรียกชื่อสารประกอบไอออนิกด้วยการเรียนรู้แบบสืบเสาะ 5 ขั้น ร่วมกับแบบจำลองระดับอนุภาค สำหรับนักเรียนชั้นมัธยมศึกษาปีที่ 4 ศักดิ์ศรี สุภาษร Q2 นานาชาติ
    วันที่ตีพิมพ์
  • 2018-10-05
    ชื่อวารสาร
  • การประชุมวิชาการและเสนอผลงานวิจัยระดับชาติและระดับนานาชาติ ครั้งที่ 6
    DOI
17 Multi step energy transfer between three Si_LTL and SiGe_LTL zeoliteloaded dyes ศิริพร จึงสุทธิวงษ์ Q2 นานาชาติ
    วันที่ตีพิมพ์
  • 2018-10-01
    ชื่อวารสาร
  • Journal of Porous Materials
    DOI
18 Fabrication of a three-dimensional electrochemical paper-based device (3D-ePAD) for individual and simultaneous detection of ascorbic acid, dopamine and uric acid Fabrication of a three-dimensional electrochemical paper-based device (3D-ePAD) for individual and simultaneous detection of ascorbic acid, dopamine and uric acid

We report the development of a three-dimensional electrochemical paper-based analytical device (3DePAD) for the individual and simultaneous determination of ascorbic acid (AA), dopamine (DA) and uric acid (UA). The device was fabricated by alkyl ketene dimer (AKD)-inkjet printing of a circularly hydrophobic zone on filter paper for application of aqueous samples coupled with screen-printing of the electrodes on the paper which was folded underneath hydrophobic zone. A self-assembled threeelectrode system, comprising a graphite paste modified with Fe3O4@Au-Cys/PANI was fabricated on the patterned paper by screen printed through the pre-designed transparent film slit. The three electrodes of Fe3O4@Au-Cys/PANI modified graphite electrodes (Fe3O4@Au-Cys/PANI/GFE) on the layout paper were served as the working electrode, the reference electrode, and the counter electrode, respectively. Cyclic voltammetry (CV) was used to study the electrochemical mechanism of AA, DA and UA. The results indicated that a high sensitivity towards AA, DA and UA was observed. Our results suggested that coating the working electrode with anionic surfactant, SDS (1 mM, pH 2), provides the distinguishable oxidation peak potential of AA and did not overlap with the oxidation peak of DA and UA. As a result, simultaneous determination of these three molecules in a mixture can be achieved. Examples of individual quantification of DA and UA in pharmaceutical and urine samples were demonstrated using differential pulse voltammetry (DPV). Under the optimum condition, the developed 3D-ePAD gave a linearity ranged from 20 to 1,000 µM for both DA and UA. The detection limits were 2.19 and 1.80 µM for DA and UA, respectively. There are no significant matrix interferences in the analyzed samples which can be concluded that the proposed method is suitable for the quantification of DA and UA with sufficient accuracy and precision.

มะลิวรรณ อมตธงไชย Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2018-07-01
    ชื่อวารสาร
  • International Journal of Electrochemical Science
19 การพัฒนาความเข้าใจมโนมติของนักเรียนระดับมัธยมศึกษาปีที่ 5 เรื่อง อัตราการเกิดปฏิกิริยาเคมี ด้วยการทดลองแบบสืบเสาะ สุภาพ ตาเมือง Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2018-07-01
    ชื่อวารสาร
  • วารสารศึกษาศาสตร์ มหาวิทยาลัยเชียงใหม่
    DOI
20 Carbon-doped boron nitride nanosheet as a promising metal-free catalyst for NO reduction: DFT mechanistic study ศิริพร จึงสุทธิวงษ์ Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2018-05-05
    ชื่อวารสาร
  • Applied Catalysis A: General
    DOI
21 Monitoring of glucose and ethanol during winefermentation by bienzymatic biosensor อัญชลี สำเภา Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2018-05-01
    ชื่อวารสาร
  • Journal of Electroanalytical Chemistry
    DOI
22 Selective amperometric flow-injection analysis of carbonfuran using a molecularly-imprinted polymer and gold coated magnetite modified carbon nanotube-paste electrode มะลิวรรณ อมตธงไชย Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2018-03-01
    ชื่อวารสาร
  • Talanta
    DOI
23 Complexometric and argentometric titrations using thread-based analytical devices ปุริม จารุจำรัส Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2018-02-17
    ชื่อวารสาร
  • Talanta
    DOI
24 Molecular docking study of pyrrolyl benzohydrazide derivatives to explore the structure requirements of InhA inhibitors พรพรรณ พึ่งโพธิ์ Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2018-02-07
    ชื่อวารสาร
  • Pure and Applied Chemistry International Conference 2018 (PACCON2018)
    DOI
25 Rational design of PknB inhibitors in class of 4-oxo-crotonic acid derivatives as highly potent anti-tuberculosis agents พรพรรณ พึ่งโพธิ์ Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2018-02-07
    ชื่อวารสาร
  • Pure and Applied Chemistry International Conference 2018 (PACCON2018)
    DOI
26 Computer aided molecular design of ATPase inhibitors in a series of 7-chloro-4-piperazinoquinoline derivatives: Molecular docking and 3D-QSAR study พรพรรณ พึ่งโพธิ์ Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2018-02-07
    ชื่อวารสาร
  • Pure and Applied Chemistry International Conference 2018 (PACCON2018)
    DOI
27 Elucidating structural basis of 4-aminoquinoline derivatives as novel M. tuberculosis DNA GyrB inhibiters: molecular docking study พรพรรณ พึ่งโพธิ์ Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2018-02-07
    ชื่อวารสาร
  • Pure and Applied Chemistry International Conference 2018 (PACCON2018)
    DOI
28 Structure based drug design of 2-(1H-benzo[d]imidazol-2-yl)-2-cyanovinyl as DNA gyrase subunit B inhibitors for anti-tuberculosis agent พรพรรณ พึ่งโพธิ์ Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2018-02-07
    ชื่อวารสาร
  • Pure and Applied Chemistry International Conference 2018 (PACCON2018)
    DOI
29 carboxamide analogues as DNA gyrase subunit B inhibitors for anti-tuberculosis agents: 3D-QSAR Molecular docking calculations พรพรรณ พึ่งโพธิ์ Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2018-02-07
    ชื่อวารสาร
  • Pure and Applied Chemistry International Conference 2018 (PACCON2018)
    DOI
30 Molecular modeling of InhA inhibitors in the class of Benzimidazole derivatives as a novel Anti-tuberculosis agents พรพรรณ พึ่งโพธิ์ Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2018-02-07
    ชื่อวารสาร
  • Pure and Applied Chemistry International Conference 2018 (PACCON 2018)
    DOI
31 The equilibrium study of methylene blue from aqueous solution using zeolite synthesized as highly potential adsorbent from water sludge พรพรรณ พึ่งโพธิ์ Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2018-02-07
    ชื่อวารสาร
  • Pure and Applied Chemistry International Conference 2018 (PACCON2018)
    DOI
32 Utilization of zeolites synthesized from water sludge for heavy metal treatment in wastewater พรพรรณ พึ่งโพธิ์ Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2018-02-07
    ชื่อวารสาร
  • Pure and Applied Chemistry International Conference 2018 (PACCON2018)
    DOI
33 A Novel Benzo[d,e]Chromene for Organic Light Emitting Diodes (OLEDs) รักเกียรติ จิตคติ Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2018-02-01
    ชื่อวารสาร
  • Applied Mechanics and Materials
    DOI
34 Poly(m-ferrocenylaniline) modified carbon nanotubes-paste electrode encapsulated in nafion film for selective and sensitive determination of dopamine and uric acid in the presence of ascorbic acid เสนอ ชัยรัมย์ Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2018-02-01
    ชื่อวารสาร
  • Journal of Saudi Chemical Society
    DOI
35 Fabricating Simple Wax Screen-Printing Paper-Based Analytical Devices To Demonstrate the Concept of Limiting Reagent in Acid−Base Reactions เสนอ ชัยรัมย์ Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2018-02-01
    ชื่อวารสาร
  • Journal of Chemical Education
    DOI
36 Atomic force microscopy investigation of phase morphology correlated with adhesive properties for modified telechelic natural rubber based-pressure sensitive adhesive ศิริวัฒน์ ระดาบุตร Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2018-01-18
    ชื่อวารสาร
  • JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY
    DOI
37 Use of a smartphone as a Colorimetric Analyzer in Paper-based Devices for Sensitive and Selective determination of Mercury in Water Samples ปุริม จารุจำรัส Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2018-01-10
    ชื่อวารสาร
  • Analytical Sciences
    DOI
38 Para rubber khit pillow by Si Tan Community, Yasothon province ชัยวุฒิ วัดจัง Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2018-01-01
    ชื่อวารสาร
  • Area Based Development Research Journal
    DOI
39 Comparison of reinforcing efficiency between calcium carbonate/carbon black and calcium carbonate/silica hybrid filled natural rubber composites สราวุธ ประเสริฐศรี Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2018-01-01
    ชื่อวารสาร
  • Defect and Diffusion Forum
    DOI
40 Thiocyanate Free Ruthenium(II) Complexes for Dye Sensitized Solar Cells (DSSCs) รักเกียรติ จิตคติ Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2018-01-01
    ชื่อวารสาร
  • Defect & Diffusion Forum
    DOI
41 DFT Study of Catalytic CO2 Hydrogenation over Pt-Decorated Carbon Nanocones: H2 Dissociation Combined with the Spillover Mechanism DFT Study of Catalytic CO2 Hydrogenation over Pt-Decorated Carbon Nanocones: H2 Dissociation Combined with the Spillover Mechanism

In this work, we investigate the catalytic role of platinum-decorated defective CNC (Pt/dCNC) in CO2 hydrogenation to formic acid (FA) by a density functional theory (DFT) approach. The reaction follows the equation CO2(g) + H2(g) → HCOOH(g). Combining highly reactive Pt atoms with defective CNC provides Pt/dCNC, a reactive monodispersed atomic catalyst for CO2 hydrogenation. We propose our new mechanism of CO2 hydrogenation over the Pt/dCNC catalyst involving a H2 dissociation and H spillover sequence that is energetically favorable. The rate-determining step is formic acid desorption that requires an energy barrier of 1.11 eV. Furthermore, our findings show that the rate of FA production is dependent on H2 concentration. Altogether, the theoretical results support the concept of the spillover mechanism, playing a key role in promoting CO2 hydrogenation via a formate intermediate. These results improve our understanding of the mechanism involving H2 dissociation with the H spillover process and the catalytic reactions that are very important for the development of highly efficient catalysts for CO2 conversion into FA.

ศิริพร จึงสุทธิวงษ์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2019-12-26
    ชื่อวารสาร
  • The Journal of Physical Chemistry C
42 A highly sensitive fenobucarb electrochemical sensor based on graphene nanoribbons-ionic liquid-cobalt phthalocyanine composites modified on screen-printed carbon electrode coupled with a flow injection analysis A highly sensitive fenobucarb electrochemical sensor based on graphene nanoribbons-ionic liquid-cobalt phthalocyanine composites modified on screen-printed carbon electrode coupled with a flow injection analysis

A sensitive and rapid method for the determination of fenobucarb by using screen-printed carbon electrode modified with graphene nanoribbons - ionic liquid - cobalt phthalocyanine (GNRs-IL-CoPc/SPCE) composites based on flow injection analysis (FIA) was developed and applied to vegetable samples. The prepared GNRs-IL-CoPc composite was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and atomic force microscopy (AFM). Moreover, cyclic voltammetry (CV), differential pulse voltammetry (DPV), and electrochemical impedance spectroscopy (EIS) were used to characterize the electrochemical behavior of the modified SPCE. The amperometric current responses were obtained from the oxidation of 2-sec-butyl-phenol, which is the product of alkaline hydrolysis of fenobucarb. The optimization of chemical variables and instrumental analysis such as composite amounts, pH, applied potential, and flow rate were carried out to obtain the best measurement. Under the optimal conditions, the proposed sensor yielded sensitivity of 0.0884 M/A·cm2, a wide linear range for detection of fenobucarb from 0.025 to 110 μM with a low detection, and quantification limits of 0.0089 μM and 0.0252 μM, respectively. Additionally, the developed sensor showed good repeatability (RSD = 3.5%, n = 10 measurements) and good reproducibility (RSD = 3.9%, n = 5 sensors). The proposed method could be effectively applied for the determination of fenobucarb in vegetable samples.

อัญชลี สำเภา Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2019-12-15
    ชื่อวารสาร
  • Journal of Electroanalytical Chemistry
43 Screen-printed microfluidic paper-based analytical device (μPAD) as a barcode sensor for magnesium detection using rubber latex waste as a novel hydrophobic reagent Screen-printed microfluidic paper-based analytical device (μPAD) as a barcode sensor for magnesium detection using rubber latex waste as a novel hydrophobic reagent

This work reports the first use of cis-1,4-polyisoprene obtained from rubber latex (RL) waste as the hydrophobic reagent for the fabrication of a microfluidic paper-based analytical device (mPAD), providing a user-friendly means for magnesium detection. The mPAD was fabricated using a screen printing technique and the barcode-like paper sensor was then used for the detection of Mg(II) ions in RL and water samples. Using different types of paper media (paper towel, Whatman No.1 and Whatman No.4), the results indicate that the key factors in optimizing the quality of the fabricated mPAD include the viscosity of cis-1,4-polyisoprene solution which could be adjusted using different solvents and heating temperatures, the mesh screen size, the pore size of the paper substrates, and the dimension of the sample zone. The fabricated mPAD, which showed high chemical resistance, durability and design flexibility, was tested for the detection of Mg(II) ions using the reaction based on complexometric titration with EDTA where Eriochrome Black T was used as an indicator. An Android application “UBU OMg Sensor” was also developed to provide a simple, fast, and accurate means for end-users to interpret results generated by our developed mPAD .

ปุริม จารุจำรัส Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2019-11-15
    ชื่อวารสาร
  • Analytica Chimica Acta
44 Novel amperometric flow-injection analysis of creatinine using a molecularly-imprinted polymer coated copper oxide nanoparticle-modified carbon-paste-electrode Novel amperometric flow-injection analysis of creatinine using a molecularly-imprinted polymer coated copper oxide nanoparticle-modified carbon-paste-electrode

We report a novel amperometric flow-injection (FI) analysis of creatinine based on a sensor comprising copper oxide nanoparticles (CuO) coated with a molecularly-imprinted polymer (CuO@MIP) and decorating a carbon-paste electrode (CPE) to form the CuO@MIP/CPE electrode. The CuO@MIP was synthesized by using CuO as the supporting core, creatinine as the template, methacrylic acid (MAA) as monomer, N, N′-(1,2-dihydroxyethylene)bis(acrylamide) (DHEBA) as cross-linker, and 2,2′-azobis (2-methylpropionitrile) (AIBN) as initiator. Morphology and structural characterization reveal that CuO nanoparticle imprinted sites (CuO) synthesized using a precipitation method, exhibits features that are well suited to creatinine detection: high surface area, good analyte diffusion and adsorption characteristics that provide shorter response times, and large numbers of specific cavities for enhanced analyte capacity and sensitivity. Cyclic voltammetric measurements indicate that our sensor provides excellent performance toward electro-oxidation of creatinine. The amperometric FI system was used to quantitatively determine creatinine at the CuO@MIP/CPE sensor, in a phosphate buffer carrier. The imprinted sensor exhibits excellent performance for creatinine oxidation at an applied potential of +0.35 V and flow rate of 0.6 mL.min−1. The as-prepared sensor exhibits a linear dynamic range for creatinine detection from 0.5 to 200 μM (r2 = 0.995) with a limit of detection of 0.083 μM (S/N = 3). The system exhibits satisfactorily good precision (%RSD = 1.94%, n = 30) and selectivity toward creatinine. There is only approximately 20% loss from initial response after 2 weeks when stored at 4 oC. We successfully applied the FI detection system to detect creatinine in human urine samples.

มะลิวรรณ อมตธงไชย Q2 นานาชาติ
    วันที่ตีพิมพ์
  • 2019-10-25
    ชื่อวารสาร
  • Journal of Pharmaceutical and Biomedical Analysis
    DOI
45 Highly sensitive and selective electrochemical paper-based device using a graphite screen-printed electrode modified with molecularly imprinted polymers coated Fe3O4@Au@SiO2 for serotonin determination Highly sensitive and selective electrochemical paper-based device using a graphite screen-printed electrode modified with molecularly imprinted polymers coated Fe3O4@Au@SiO2 for serotonin determination

Herein, we propose a highly sensitive and selective three-dimensional electrochemical paper-based analytical device (3D-ePAD) to determine serotonin (Ser). It uses a graphite-paste electrode modified with nanoparticles coated with molecularly imprinted polymer (MIP). Fe3O4@Au nanoparticles were encapsulated with silica to create novel nano-sized MIP. Morphology and structural characterization reveal that silica imprinted sites (Fe3O4@Au@SiO2) synthesized via sol-gel methods provide excellent features for Ser detection, including high porosity, and greatly improve analyte diffusion and adsorption to provide a faster response by the MIP sensor. The template molecule was effectively removed by solvent extraction to provide a greater number of specific cavities that enhance analyte capacity and sensitivity. The 3D-ePAD was fabricated by alkyl ketene dimer (AKD)-inkjet printing of a circular hydrophobic detection zone on filter paper for application of aqueous samples, coupled with screen-printed electrodes on the paper, which was folded underneath the hydrophobic zone. The sensor was constructed by drop coating of Fe3O4@Au@SiO2-MIP nanocomposites on the graphite electrode (GPE) surface. The MIP sensor (Fe3O4@Au@SiO2-MIP/GPE) was used in the detection of Ser by linear-sweep voltammetry (LSV) in 0.1 M phosphate buffer at pH 8.0. The device exhibits high sensitivity toward Ser, which we attribute to synergistic effects between catalytic properties, electrical conductivity of Fe3O4@Au@SiO2, and significantly increased numbers of imprinted sites. Ser oxidation was observed at +0.39 V. Anodic peak currents for Ser show linearity from 0.01 to 1000 μM (y = 0.0075 ± 0.0049 x + 0.4071 ± 0.0052, r2 = 0.993), with a detection limit of 0.002 μM (3S/N). The device provides good repeatability (%relative standard deviations; RSD) = 4.23%, calculated from the current responses of ten different MIP sensors). The device also exhibits high selectivity and reproducibility (%RSD = 8.35%, obtained from five calibration plots). The analytical performance of the device is suitable for the determination of Ser in pharmaceutical capsules and urine samples.

มะลิวรรณ อมตธงไชย Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2019-10-24
    ชื่อวารสาร
  • Analytica Chimica Acta
    DOI
46 Novel Three-Dimensional Molecularly Imprinted Polymer-Coated Carbon nanotubes (3D-CNTs@MIP) for Selective Detection of Profenofos in Food Novel three-Dimensional molecularly imprinted polymer-coated carbon nanotubes (3D-CNTs@MIP) for selective detection of profenofos in food

A new and facile method for selective measurement of profenofos (PFF) using a simple flow-injection system with a molecularly-imprinted-polymer-coated carbon nanotube (3D-CNTs@MIP) amperometric sensor is proposed. The 3D-CNTs@MIP was synthesized by successively coating the surface of carboxylated CNTs with SiO2 and vinyl end groups, then terminating with molecularly imprinted polymer (MIP) shells. MIP was grafted to the CNT cores using methacrylic acid (MAA) monomer, ethylene glycol dimethacrylate (EGDMA) as cross linker, and 2,20 -azobisisobutyronitrile (AIBN) as initiator. We constructed the PFF sensor by coating the surface of a glassy carbon electrode (GCE) with 3D-CNTs@MIP and removed the imprinting template by solvent extraction. Morphological and structural characterization reveal that blending of the MIP on the CNT surface significantly increases the selective surface area, leading to greater numbers of imprinting sites for improved sensitivity and electron transfer. The 3DCNTs@MIP sensor exhibits a fast response with good recognition when applied to PFF detection by cyclic voltammetry and amperometry. The PFF oxidation current signal appears at þ0.7 V vs Ag/AgCl using 0.1 M phosphate buffer (pH 7.0) as the carrier solution. The designed 3D-imprinted sensor provides a

มะลิวรรณ อมตธงไชย Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2019-10-17
    ชื่อวารสาร
  • Analytica Chimica Acta
    DOI
47 In silico study directed towards identification of the key structural features of GyrB inhibitors targeting MTB DNA gyrase: HQSAR, CoMSIA and molecular dynamics simulations In silico study directed towards identification of the key structural features of GyrB inhibitors targeting MTB DNA gyrase: HQSAR, CoMSIA and molecular dynamics simulations

Mycobacterium tuberculosis DNA gyrase subunit B (GyrB) has been identified as a promising target for rational drug design against fluoroquinolone drug-resistant tuberculosis. In this study, we attempted to identify the key structural feature for highly potent GyrB inhibitors through 2D-QSAR using HQSAR, 3D-QSAR using CoMSIA and molecular dynamics (MD) simulations approaches on a series of thiazole urea core derivatives. The best HQSAR and CoMSIA models based on IC50 and MIC displayed the structural basis required for good activity against both GyrB enzyme and mycobacterial cell. MD simulations and binding free energy analysis using MM-GBSA and waterswap calculations revealed that the urea core of inhibitors has the strongest interaction with Asp79 via hydrogen bond interactions. In addition, cation-pi interaction and hydrophobic interactions of the R2 substituent with Arg82 and Arg141 help to enhance the binding affinity in the GyrB ATPase binding site. Thus, the present study provides crucial structural features and a structural concept for rational design of novel DNA gyrase inhibitors with improved biological activities against both enzyme and mycobacterial cell, and with good pharmacokinetic properties and drug safety profiles.

พรพรรณ พึ่งโพธิ์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2019-10-14
    ชื่อวารสาร
  • SAR AND QSAR IN ENVIRONMENTAL RESEARCH
    DOI
48 FeIIFeIII layered double hydroxide nanosheets (FeIIFeIII LDHNS) as an enzyme mimic for colorimetric detection of H2O2 FeIIFeIII layered double hydroxide nanosheets (FeIIFeIII LDHNS) as an enzyme mimic for colorimetric detection of H2O2

In this study, a new, rapid, sensitive, and convenient approach for colorimetric detection of H2O2 using FeIIFeIII layered double hydroxide nanosheets (FeIIFeIII LDHNS) is reported. The FeIIFeIII LDHNS were constructed from a mixture of divalent and trivalent Fe ions by a co-precipitation method. FeIIFeIII LDHNS were found to possess superior intrinsic peroxidase-like activity. They were used to catalyze the oxidation of a peroxidase substrate 3,3′,5,5′-tetramethylbenzidine (TMB) and 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) diammonium salt in the presence of H2O2 to produce a blue and green solution product, respectively, that provided colorimetric detection of H2O2. The colorimetric detection of H2O2 was conveniently carried out by incubating at room temperature. Moreover, for the ABTS substrate, the experiment was facilely and successfully carried out in deionized water at a pH of approximately 5.6. The colorimetric assays displayed linearity for H2O2 determination by using TMB and ABTS systems in the range of 0.1–50 μM and 0.5–20 μM, respectively, and the corresponding limits of detection were found to be 0.05 μM and 0.2 μM, respectively. The catalytic reaction follows Michaelis–Menten kinetics and exhibits strong affinity towards TMB, ABTS, and H2O2 substrates. This selective approach could be applied for H2O2 detection in real milk and disinfectant samples. It is expected that there is great potential for the proposed method for exact detection of H2O2 in biotechnology, clinical diagnoses, the food industry, and other industries

สุภาพ ตาเมือง Q2 นานาชาติ
    วันที่ตีพิมพ์
  • 2019-10-07
    ชื่อวารสาร
  • Analytical Methods
    DOI
49 Photophysical Properties of Functionalized Double Decker Phenylsilsesquioxane Macromonomers: [PhSiO1.5]8[OSiMe2]2 and [PhSiO1.5]8[O0.5SiMe3]4. Cage-Centered Lowest Unoccupied Molecular Orbitals Form Even When Two Cage Edge Bridges Are Removed, Verified by Modeling and Ultrafast Magnetic Light Scattering Experiments hotophysical Properties of Functionalized Double Decker Phenylsilsesquioxane Macromonomers: [PhSiO1.5]8[OSiMe2]2 and [PhSiO1.5]8[O0.5SiMe3]4. Cage-Centered Lowest Unoccupied Molecular Orbitals Form Even When Two Cage Edge Bridges Are Removed, Verified by Modeling and Ultrafast Magnetic Light Scattering Experiments

Bromination and iodination of title double decker (DD) phenylsilsesquioxane macromonomers occurs at ortho and para positions, respectively, as in PhT8,10,12 cages. Heck cross-coupling with 4-Me/CNstyrene gives the corresponding 4-Me/CNstilbene-substituted cages. All compounds were characterized by FTIR, MALDI-TOF, TGA, NMR and GPC. These compounds show UV−vis absorptions very similar to individual stilbene analogues. However, emission for all macromonomers, except p-MeStil2Ph6DD(OTMS)4, is redshifted 50−70 nm as seen before in full and partial cages centered LUMOs conjugated to all the stilbene moieties suggesting semiconducting behavior. Cagecentered LUMO formation even occurs in a DD cage where two of four Si−O−Si bridges are broken suggesting that LUMO formation is an extremely common phenomenon. These results are supported by both modeling studies and nonlinear light scattering in which magnetic dipole moments form and scatter light in the cage centers. The exception behaves like p-methylstilbene in both absorption and emission indicating that the onset of semiconducting behavior requires a minimum number of substituents and points to the potential to tailor band gaps and therefore multiple photophysical properties.

ศิริพร จึงสุทธิวงษ์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2019-09-26
    ชื่อวารสาร
  • Macromolecules
50 Development of a novel three-dimensional microfluidic paper-based analytical device (3D-µPAD) for chlorpyrifos detection using graphene quantum-dot capped gold nanocomposite for colorimetric assay Development of a novel three-dimensional microfluidic paper-based analytical device (3D-µPAD) for chlorpyrifos detection using graphene quantum-dot capped gold nanocomposite for colorimetric assay

This report presents a three-dimensional microfluidic paper-based analytical device (3D-μPAD) with colorimetric assay, for chlorpyrifos organophosphate pesticide detection in vegetable samples. The 3DµPAD was fabricated by one-step polymer-screen-printing, using rubber latex (RL) waste as a hydrophobic reagent for low-cost and simple manufacture. The 3D-µPAD design comprises two sheets; a testing sheet containing two circular zones, and a sampling sheet in the shape of a dumbbell design. Assay involves the acetylcholinesterase (AChE)-catalysed hydrolysis of an acetylthiocholine (ATCh) substrate to produce thiocholine. Thiocholine causes the aggregation of graphenequantum-dot capped gold-nanocomposite particles (GQD-AuNPs) to give a purple–blue-coloured solution. Incubation with chlorpyrifos inhibits the hydrolysis reaction, resulting in anti-aggregation of redcoloured GQD-AuNPs. The assay can determine chlorpyrifos by ImageJ detection, over a linear range of 0.001 to 1.0 µg mL−1 , with a detection limit of 0.0007 µg mL−1 , without sophisticated instrumentation. The developed 3D-µPAD was applied to detect chlorpyrifos in spiked vegetable samples, with per cent recoveries ranging from 93.0% to 104.6%. Our developed device provides good precision (%RSD ranges from 0.3 to 1.6). The calculated relative error comparison with HPLC ranges from 1.0% to 5.2%, indicating a high degree of accuracy. The 3D-µPAD exhibits good sensitivity and selectivity for a low-cost and rapidscreening test for the presence of insecticides, and might be useful for on-site applications.

มะลิวรรณ อมตธงไชย Q4 นานาชาติ
    วันที่ตีพิมพ์
  • 2019-08-07
    ชื่อวารสาร
  • International Journal of Environmental Analytical Chemistry
    DOI
51 A non-toxic approach to assess total antioxidant capacity (TAC) of exotic tropical fruits from Thailand A non-toxic approach to assess total antioxidant capacity (TAC) of exotic tropical fruits from Thailand

A simple flow injection analysis (FIA) integrating with a metal-free approach for total antioxidant capacity (TAC) was developed. The non-toxic reaction was based on generating a vibrant blue radical from imipramine to avoid the potential interferents arising from the colorful fruit extracts. The blue radical can be rapidly scavenged by antioxidant compounds present in the sample. TAC values of Thai tropical fruit extracts were assessed by monitoring the quenching in absorbance of the test mixture following the addition of the antioxidant compounds/fruit extracts. The FIA co-operated in order to increase the sample throughput. The results demonstrated that Antidesma thwaiteaianum Muell. Arg. has the highest capacity followed by Terminalia chebula Retz. and Phyllanthus Emblica Linn., respectively. An excellent correlation between the proposed method was found with the DPPH assay. The proposed method allowed the TAC determination of fruit extracts in a high-throughput and straightforward way in accordance with the principles of green analytical chemistry.

มะลิวรรณ อมตธงไชย Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2019-07-12
    ชื่อวารสาร
  • Journal of Food Science and Technology
    DOI
52 การศึกษาฤทธิ์ในการต้านอนุมูลอิสระและปริมาณฟีนอลิกรวมของสารสกัดข้าวกล้องงอก สมจินตนา ทวีพานิชย์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2019-07-11
    ชื่อวารสาร
  • เอกสารสืบเนื่องจากการประชุมวิชาการ มอบ.วิจัย ครั้งที่ 13
    DOI
53 อันตรกิริยาที่สําคัญของสารอนุพันธ์ benzofuran ในการยับยั้งเอนไซม์ GyrB ของเชื้อ M. tuberculosis ด้วยระเบียบวิธีการคํานวณโมเลกุลาร์ด็อกกิ้ง พรพรรณ พึ่งโพธิ์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2019-07-11
    ชื่อวารสาร
  • เอกสารสืบเนื่องจากการประชุมวิชาการ มอบ.วิจัย ครั้งที่ 13
    DOI
54 การศึกษาความสัมพันธ์ระหว่างโครงสร้างกับค่ากัมมันตภาพทางชีวภาพเชิงสามมิติ และการคํานวณโมเลกุลาร์ด็อกกิ้งของสารอนุพันธ์ Pyrrolyl Benzohydrazide และ Pyrrolyl Benzamide เพื่อการยับยั้งเชื้อวัณโรค พรพรรณ พึ่งโพธิ์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2019-07-11
    ชื่อวารสาร
  • เอกสารสืบเนื่องจากการประชุมวิชาการ มอบ.วิจัย ครั้งที่ 13
    DOI
55 แผ่นยางปูพื้นจากยางธรรมชาติและกากกาแฟ สายสมร ลำลอง Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2019-07-11
    ชื่อวารสาร
  • เอกสารสืบเนื่องจากการประชุมวิชาการ มอบ.วิจัย ครั้งที่ 13
    DOI
56 การกําจัดสีย้อมเมทิลีนบลู โดยใช้จีโอพอลิเมอร์เป็นตัวดูดซับที่มีประสิทธิภาพสูง สายสมร ลำลอง Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2019-07-11
    ชื่อวารสาร
  • การประชุมวิชาการ มอบ.วิจัย ครั้งที่ 13
    DOI
57 การศึกษารูปแบบการวางตัวและอันตรกิริยาที่สําคัญของสารอนุพันธ์ nitro-thiazole ที่เป็นสารยับยั้งเอนไซม GyrB ด้วยระเบียบวิธีการคํานวณโมเลคิวลาร์ด็อกกิ้ง พรพรรณ พึ่งโพธิ์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2019-07-11
    ชื่อวารสาร
  • การประชุมวิชาการ มอบ.วิจัย ครั้งที่ 13
    DOI
58 การพัฒนาผลสัมฤทธิ์ทางการเรียนเรื่อง ปฏิกิริยาเคมีด้วยการเรียนรู้แบบสืบเสาะ (5Es) ร่วมกับทคนิคทํานาย-สังเกต-อธิบาย สําหรับนักเรียนชั้นมัธยมศึกษาปีที่ 2 ศักดิ์ศรี สุภาษร Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2019-07-11
    ชื่อวารสาร
  • การประชุมวิชาการ มอบ.วิจัย ครั้งที่ 13
    DOI
59 Starch hydrogel-loaded cobalt nanoparticles for hydrogen production from hydrolysis of sodium borohydride Starch hydrogel-loaded cobalt nanoparticles for hydrogen production from hydrolysis of sodium borohydride

In this work, starch hydrogel was successfully prepared using a citric acid cross-linking method and then was utilized in the preparation of starch hydrogel-loaded cobalt nanoparticles (CoNPs) by the reduction of Co2+ ions loaded within the starch hydrogel network. The swelling behavior of starch hydrogel as a function of temperature and pH was also investigated. The resulting hydrogel-loaded CoNPs were confirmed using a number of techniques including powder x-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, transmission electron microscopy (TEM), selected area electron diffraction (SAED) and thermogravimetric analysis (TGA). The activity of starch hydrogel-loaded CoNPs was evaluated by employing them as a catalyst for the hydrogen production from the hydrolysis of sodium borohydride (NaBH4). The activation energy (Ea) was 52.18 kJ mol−1 ; whereas, the activation enthalpy (ΔH#) and activation entropy (ΔS#) were 49.54 kJ mol−1 and −138.61 kJ mol−1 , respectively. The activity of starch hydrogel-loaded CoNPs maintained over the 5 cycles of utilization. Due to its biocompatibility, flexibility and nontoxicity, starch hydrogel could be considered as a promising candidate to be used as a template for the preparation of metal nanoparticles in the hydrogen production and even in catalysis of other reactions.

เสนอ ชัยรัมย์ Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2019-06-14
    ชื่อวารสาร
  • Advances in Natural Sciences: Nanoscience and Nanotechnology
    DOI
60 Optimization of Ultrasonic-Assisted Extraction and Purification of Rhein from Cassia fistula Pod Pulp Optimization of Ultrasonic-Assisted Extraction and Purification of Rhein from Cassia fistula Pod Pulp

: Rhein is used as an active ingredient in laxatives in medicinal herbal products and is a chemical marker for quality control purposes. Thus, a simple and effective method for the optimized extraction of a high amount of rhein from the fruit pulp of Cassia fistula was investigated using ultrasonic-assisted extraction (UAE). The response surface methodology was applied to find the most suitable parameters for optimizing the extraction process and to study the factors’ relationships with each other. The best conditions for ultrasonic extraction were the application of 1:40 g/mL solid-to-liquid ratio and 10% EtOH–H2O as a solvent at 75 ◦C for 40 min. This method was compared to a conventional decoction in two variations. In these experiments, it was confirmed that the UAE was more favorable than the decoction methods. The resulting crude extract was further purified by liquid–liquid extraction with a basic pH adjustment, followed by recrystallization. High-purity rhein was obtained by using chromatographic techniques and nuclear magnetic resonance spectroscopy. Therefore, this study suggests that UAE is an efficient alternative method for the extraction of rhein from C. fistula pod pulp. The resulting optimized conditions can be applied as a useful tool for the large-scale industrial production of a rhein-rich plant extract.

นิภาวรรณ พองพรหม Q2 นานาชาติ
    วันที่ตีพิมพ์
  • 2019-05-02
    ชื่อวารสาร
  • Molecules
    DOI
61 Bioactive oxaphenalenone dimers from the fungus Talaromyces macrosporus KKU-1NK8 ศิริพร จึงสุทธิวงษ์ Q2 นานาชาติ
    วันที่ตีพิมพ์
  • 2019-04-01
    ชื่อวารสาร
  • Fitoterapia
    DOI
62 การแก้ปัญหาของนักเรียนชั้นมัธยมศึกษาปีที่ 4 ในการจัดการเรียนรู้แบบสะเต็มศึกษาเรื่องพันธะโคเวเลนต์. กานต์ตะรัตน์ วุฒิเสลา Q2 นานาชาติ
    วันที่ตีพิมพ์
  • 2019-03-30
    ชื่อวารสาร
  • การประชุมวิชาการระดับชาติ ครั้งที่ 11 ประจำปี 2562
    DOI
63 Novel biodegradable hydrogel based on natural polymers: synthesis, characterization, swelling/reswelling and biodegradability สายันต์ แสงสุวรรณ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2019-03-01
    ชื่อวารสาร
  • European Polymer Journal
    DOI
64 Use of unmodified silver nanoparticles (AgNPs) as colorimetric Hg(II) sensor: A new approach to sensitive and high sample throughput determination of Hg(II) under high influence of ionic suppression Use of unmodified silver nanoparticles (AgNPs) as colorimetric Hg(II) sensor: A new approach to sensitive and high sample throughput determination of Hg(II) under high influence of ionic suppression

Facile unmodified silver nanoparticles (AgNPs) as colorimetric sensor for determination of Hg(II) ions in aqueous samples were developed using UV-Vis spectrophotometry. Abrupt change in absorbance of the AgNPs was observed, which progressively decreased and slightly shifted to the blue wavelength as the concentration of Hg(II) increased. It appears that the AgNPs were oxidized by Hg(II), resulting in disintegration of the AgNPs and Hg(0). Deposition of Hg(0) on the surface of AgNPs also occurred, resulting in amalgam particles of mercury (Hg-Ag). Interestingly, the developed approach showed a significant enhancement in the Hg(II) analytical sensitivity when formic acid was doped onto the AgNPs, with the linearity range of 0.01–10 mg L−1 (r2 = 0.999) providing the quantitative detection limit of 0.007 mg L−1 (3SD blank/slope of the calibration curve). Greater selectivity toward Hg(II) over other ions and colour dyes was also observed, likely a result of stabilization by polyvinylpyrrolidone (PVP), which kept the AgNPs well-stabilized and dispersed in the bulk aqueous environment making them resistant to ionic suppression. Under using a 96-well microplate and a smartphone equipped with homemade application as a colorimetric analyzer under controlled lighting, high sample throughput (128 sample h−1, n = 4) was achieved, establishing its potential for practical analysis. The percentage recoveries of spiked aqueous samples obtained from the microplate-based system were in acceptable range, in agreement with the values obtained from the UV-Vis spectrophotometry-based system. The proposed colorimetric sensor has been shown to provide a rapid, simple, sensitive and selective detection of Hg(II) ions in various aqueous samples.

ปุริม จารุจำรัส Q4 นานาชาติ
    วันที่ตีพิมพ์
  • 2019-03-01
    ชื่อวารสาร
  • International Journal of Environmental Analytical Chemistry
    DOI
65 Elucidating the binding interaction and binding free energy of DprE1 inhibitors via molecular docking calculations and molecular dynamics simulations พรพรรณ พึ่งโพธิ์ Q4 นานาชาติ
    วันที่ตีพิมพ์
  • 2019-02-07
    ชื่อวารสาร
  • Pure and Applied Chemistry International Conference 2019 (PACCON 2019)
    DOI
66 The investigations of binding interactions between benzofuran derivatives and MTB GyrB ATPase domain binding site based on molecular dynamics simulations พรพรรณ พึ่งโพธิ์ Q4 นานาชาติ
    วันที่ตีพิมพ์
  • 2019-02-07
    ชื่อวารสาร
  • Pure and Applied Chemistry International Conference 2019 (PACCON 2019)
    DOI
67 Molecular modeling of moracins as ATPase inhibitors of MTB DNA gyrase พรพรรณ พึ่งโพธิ์ Q4 นานาชาติ
    วันที่ตีพิมพ์
  • 2019-02-07
    ชื่อวารสาร
  • Pure and Applied Chemistry International Conference 2019 (PACCON 2019)
    DOI
68 Insight into crucial interaction of nitrothiazole derivatives as highly potential GyrB inhibitors using computer aided molecular design approaches พรพรรณ พึ่งโพธิ์ Q4 นานาชาติ
    วันที่ตีพิมพ์
  • 2019-02-07
    ชื่อวารสาร
  • Pure and Applied Chemistry International Conference 2019 (PACCON 2019)
    DOI
69 Design DNA gyrase inhibitors of 4-aminoquinoline derivatives as anti-tuberculosis: Molecular docking calculations, Molecular dynamics simulations and 3D-QSAR study พรพรรณ พึ่งโพธิ์ Q4 นานาชาติ
    วันที่ตีพิมพ์
  • 2019-02-07
    ชื่อวารสาร
  • Pure and Applied Chemistry International Conference 2019 (PACCON 2019), Bangkok,Thailand, Pages
    DOI
70 Antioxidant Activity and Phenolic Profiles of Traditional Thai Rice Varieties พรพรรณ พึ่งโพธิ์ Q4 นานาชาติ
    วันที่ตีพิมพ์
  • 2019-02-07
    ชื่อวารสาร
  • Pure and Applied Chemistry International Conference 2019, Bangkok,
    DOI
71 Synthesis of Zero Valent Iron Nanoparticles And the Study of Congo Red Dye Adsorption Efficiency: Equilibrium and Kinetic Studies พรพรรณ พึ่งโพธิ์ Q4 นานาชาติ
    วันที่ตีพิมพ์
  • 2019-02-07
    ชื่อวารสาร
  • Pure and Applied Chemistry International Conference 2019
    DOI
72 Synthesis of 6-Chloro-7-arylaminoisoquinoline-5,8-dione and Its Derivatives as Cytostatic Compounds Synthesis of 6Chloro-7-arylaminoisoquinoline-5,8-dione and Its Derivatives as Cytostatic Compounds

Our group has previously reported the synthesis of azanaphthoquinone annelated pyrrole derivatives which showed good inhibition on cervical carcinoma (HeLa Cell). In this work, we were interested on introducing sulfur atom into the core structure by condensation with thiosemicarbazide and thiourea to obtain the potential anticancer compounds. The synthetic pathway started from oxidation reaction of 5-hydroxyisoquinoline (5) to give 6,7- dichloro-isoquinoline-5,8-dione (6). The substitution of 6,7-dichloroisoquinoline-5,8-dione (6) with aniline and 1,4-phenylenediamine furnished the corresponding products 2a and 2b, respectively, in good yields. Condensation of thiourea and thiosemicarbazide into 2a and 2b yielded the corresponding 3a-b and 4a-b in good yields. The evaluation of cytotoxicity on human colon adenocarcinoma cells (HT-29 cells) and human heptatoadenocacinoma cells (HepG2 cells) showed that all synthesized compounds 2-4 exhibited good cytotoxicity. Introduction of sulfur atom into the core structure was found to enhance the cytotoxicity of the compounds. Compounds 2b, 3b and 4b bearing an amino (-NH2) group on the aromatic ring exhibited higher cytotoxicity in comparison to those with a hydrogen atom (compounds 2a, 3a and 4a). 

นิภาวรรณ พองพรหม ยังไม่มีระดับ Quartile Scor นานาชาติ
    วันที่ตีพิมพ์
  • 2019-02-07
    ชื่อวารสาร
  • Proceedings of Pure and Applied Chemistry International Conference 2019 (PACCON 2019)
    DOI
73 Influence of Maleic Anhydride-Grafted Polybutadiene on the Properties of Acrylonitrile Butadiene Rubber/Ethylene-Propylene Diene Rubber Blends สราวุธ ประเสริฐศรี ยังไม่มีระดับ Quartile Scor นานาชาติ
    วันที่ตีพิมพ์
  • 2019-02-07
    ชื่อวารสาร
  • Pure and Applied Chemistry International Conference 2019 (PACCON 2019)
    DOI
74 Interaction and structural requirement of 4-thiazolidinone (rhodanine) inhibitors as potential anti-tuberculosis agents: MD simulations พรพรรณ พึ่งโพธิ์ ยังไม่มีระดับ Quartile Scor นานาชาติ
    วันที่ตีพิมพ์
  • 2019-02-07
    ชื่อวารสาร
  • Pure and Applied Chemistry International Conference 2019 (PACCON 2019)
    DOI
75 Molecular modelling of Mycobacterium tuberculosis GyrB inhibitors as anti-tuberculosis agent พรพรรณ พึ่งโพธิ์ ยังไม่มีระดับ Quartile Scor นานาชาติ
    วันที่ตีพิมพ์
  • 2019-02-07
    ชื่อวารสาร
  • Pure and Applied Chemistry International Conference 2019 (PACCON 2019)
    DOI
76 Molecular docking calculations of novel pyrrolyl benzohydrazide and pyrrolyl benzamide derivatives InhA inhibitors as anti-tuberculosis agents พรพรรณ พึ่งโพธิ์ ยังไม่มีระดับ Quartile Scor นานาชาติ
    วันที่ตีพิมพ์
  • 2019-02-07
    ชื่อวารสาร
  • Pure and Applied Chemistry International Conference 2019 (PACCON 2019)
    DOI
77 Utilization of zeolites synthesized from water sludge for study of manganese treatment in wastewater มาลี ประจวบสุข ยังไม่มีระดับ Quartile Scor นานาชาติ
    วันที่ตีพิมพ์
  • 2019-02-07
    ชื่อวารสาร
  • Pure and Applied Chemistry International Conference 2019 (PACCON 2019)
    DOI
78 Removal of Anionic Dyes from Aqueous Solution using Surfactant Modification of Ranong White Clay as Highly Potential Adsorbent พรพรรณ พึ่งโพธิ์ ยังไม่มีระดับ Quartile Scor นานาชาติ
    วันที่ตีพิมพ์
  • 2019-02-07
    ชื่อวารสาร
  • Pure and Applied Chemistry International Conference 2019 (PACCON 2019)
    DOI
79 Removal of industrial dyes from aqueous solution using geopolymer from metakaolin as a highly potential adsorbent สายสมร ลำลอง ยังไม่มีระดับ Quartile Scor นานาชาติ
    วันที่ตีพิมพ์
  • 2019-02-07
    ชื่อวารสาร
  • Pure and Applied Chemistry International Conference (PACCON2019)
    DOI
80 Development of Agricultural Waste for Reuse Catalyst สายสมร ลำลอง ยังไม่มีระดับ Quartile Scor นานาชาติ
    วันที่ตีพิมพ์
  • 2019-02-07
    ชื่อวารสาร
  • Pure and Applied Chemistry International Conference 2019 (PACCON 2019)
    DOI
81 A direct and sensitive electrochemical sensing platform based on ionic liquid functionalized graphene nanoplatelets for the detection of bisphenol A A direct and sensitive electrochemical sensing platform based on ionic liquid functionalized graphene nanoplatelets for the detection of bisphenol A

A simple electrochemical sensor for bisphenol A (BPA) was developed based on a composite of graphene nanoplatelets (GNPs) and 1-butyl-2, 3-dimethylimidazolium tetrafluoroborate (ionic liquid, IL) as a modifier for glassy carbon paste electrodes (GCPEs). Scanning electron (SEM) and atomic force microscopy (AFM) were employed to characterize the morphology and surface modification. The electrochemical behavior of BPA on IL-GNP/GCPEs was investigated and the results showed that IL-GNP composites enhance the electrochemical signal toward BPA due to the synergetic effect of GNPs and IL. The experimental parameters including the amount of IL and GNPs, pH of solution, pulse potential, step potential, and scan rate were optimized. Under optimal conditions, the proposed sensor exhibited a linear relationship between signal and BPA concentrations ranging from 0.02–5.0 μM, with detection and quantification limits of 6.4 nM and 0.02 μM respectively. Moreover, the electrochemical sensor showed good repeatability (RSD = 3.3%, n = 5 measurements), good reproducibility (RSD = 3.8%, n = 5 sensors), high accuracy of 95.3–104.5% recovery, acceptable selectivity, and stability. The sensor was successfully applied to the determination of BPA in water samples in contact with plastic materials. The results were satisfactory and in agreement with reference values from a standard HPLC method.

อัญชลี สำเภา Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2019-01-15
    ชื่อวารสาร
  • Journal of Electroanalytical Chemistry
82 Development of multicomponent interpenetrating polymer network (IPN) hydrogel films based on 2-hydroxyethyl methacrylate (HEMA), acrylamide (AM), polyvinyl alcohol (PVA) and chitosan (CS) with enhanced mechanical strengths, water swelling and antibacterial properties Development of multicomponent interpenetrating polymer network (IPN) hydrogel films based on 2-hydroxyethyl methacrylate (HEMA), acrylamide (AM), polyvinyl alcohol (PVA) and chitosan (CS) with enhanced mechanical strengths, water swelling and antibacterial properties

The novel poly(2-hydroxyethyl methacrylate-co-acrylamide)/polyvinyl alcohol/chitosan (P(HEMA-co-AM)/PVA/CS) interpenetrating polymer network (IPN-CS) hydrogel films were fabricated by two-step free radical polymerization, aiming to enhance the tensile strength, water swelling and antibacterial activity compared to P(HEMA-co-AM)/PVA hydrogel (IPN-0%CS). The different weight ratios of PVA and CS components were firstly crosslinked by glutaraldehyde. Then P(HEMA-co-AM) copolymers were interpenetrated into the primary networks of PVA/CS and crosslinked by ethylene glycol dimethacrylate to form the IPN-CS hydrogels. The functional group analysis confirmed that the IPN-CS hydrogels were successfully synthesized. The crystallinity, Tg and Tm, microporous and surface area of IPN-CS hydrogels tended to increase significantly with increasing CS content. The swelling equilibrium and surface area of IPN-CS hydrogel exhibited a linearly relationship with CS content. The swelling behavior of IPN-CS hydrogels was best described by the pseudo-first order kinetics and followed a non-Fickian diffusion mechanism. The IPN-5%CS hydrogel film exhibited the highest tensile strength (22.4 MPa) which was increased 2.7 folds of IPN-0%CS. All IPN-CS hydrogels demonstrated an excellent antibacterial activity against E. coli. These results suggest that the IPN-CS hydrogel films have promising potential used as wound dressings.

สายันต์ แสงสุวรรณ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2020-11-01
    ชื่อวารสาร
  • Reactive and Functional Polymers
83 Novel amino-containing molecularly-imprinted polymer coating on magnetite-gold core for sensitive and selective carbofuran detection in food Novel amino-containing molecularly-imprinted polymer coating on magnetite-gold core for sensitive and selective carbofuran detection in food

We report a novel and facile method for synthesis of amino-containing molecularly-imprinted coatings on magnetite-gold nanoparticle cores (Fe3O4@Au-MIP-NH2) for constructing robust and sensitive carbofuran sensors. Fe3O4@Au-MIP-NH2 nanoparticles were synthesized by successive self-assembly of organic thiols, 11–mercaptoundecanoic acid, on magnetite-gold core surfaces, followed by coupling with an amino-containing molecularly-imprinted polymer (MIP-NH2) shells. The MIP-NH2 nanocomposite was synthesized via two polymerization steps to form carbofuran imprinted pre-polymer nanoparticles and then terminating the surface with amino-containing polymer. The synthesized pre-polymer nanoparticles possess a large surface-to-volume ratio. This approach allows for increased numbers of carbofuran template molecules to attach to the polymer surface to form larger recognition sites. We constructed the highly sensitive and selective carbofuran amperometric sensor by coating the surface of a glassy carbon electrode with Fe3O4@Au-MIP-NH2 coupled with a simple flow-injection system. Morphological and structural characterization reveals that the coupling of the MIP-NH2 on the Fe3O4@Au core surface significantly increases the recognition surface area and electron transfer efficiency to provide improved selectivity and sensitivity. The MIP-NH2 modified electrode shows substantially enhanced carbofuran current response, which is by a factor of about twenty times that of the non-imprinted polymer electrode. The modified electrode provides fast response with good selectivity when applied to carbofuran detection by amperometry. The carbofuran oxidation-current signal appears at + 0.50 V vs Ag/AgCl, using 0.1 M phosphate buffer (pH 7.0) as the carrier solution. The designed Fe3O4@Au-MIP-NH2 sensor provides a linear response over the range 0.01–100 µM (r2 = 0.9967) with a low detection limit of 1.7 nM. The intraday and inter-day precision (%RSD) of 5 µM CBF are 1.4% and 1.8%, respectively. We demonstrate the successful application of the sensor to the detection of CBF in fruit and vegetable samples.

มะลิวรรณ อมตธงไชย Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2020-11-01
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  • Microchemical Journal
84 Local structure elucidation and reaction mechanism of light naphtha aromatization over Ga embedded H-ZSM-5 zeolite: Combined DFT and experimental study Local structure elucidation and reaction mechanism of light naphtha aromatization over Ga embedded H-ZSM-5 zeolite: Combined DFT and experimental study

Local structures and mechanisms for n-pentane aromatization on Ga embedded H-ZSM-5 zeolite (Ga/ZSM-5) were elucidated using Synchrotron-based X-ray absorption spectroscopy (XAS) and density functional theory (DFT) calculations to understand the role of Ga/ZSM-5 zeolite in aromatics synthesis. XAS data suggests that Ga ligates with four oxygen or four hydrogen atoms. Catalytic tests results suggest that conversion by Ga/ZSM-5 catalyst cannot occur via C6–C8 non-aromatic intermediates, while the availability of Ga metal sites promotes the aromatization of C2 and C3 species. Therefore, conversion of n-pentane to benzene or toluene comprises four steps, i) cracking, ii) GaH2 activation, iii) cyclization, and iv) dehydrogenation. Our model predicts the key intermediate in n-pentane aromatization on Ga/ZSM-5 zeolite to be a five-membered Ga-C4 ring structure. The ring undergoes expansion to form a seven-membered Ga-C6 ring. Moreover, we discuss thermodynamics and kinetic results for the benzene and toluene formation pathways. Our results provide new finding for the role of Ga/ZSM-5 zeolites in n-pentane aromatization processes.

ศิริพร จึงสุทธิวงษ์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2020-10-15
    ชื่อวารสาร
  • Microporous and Mesoporous Materials
    DOI
85 Removal of H2S to produce hydrogen in the presence of CO on a transition metal-doped ZSM-12 catalyst: a DFT mechanistic study Removal of H2S to produce hydrogen in the presence of CO on a transition metal-doped ZSM-12 catalyst: a DFT mechanistic study

Hydrogen sulfide (H2S) leads to corrosion in transport lines and poisoning of many catalysts. Meanwhile, H2S is an inexhaustible potential source of hydrogen, which is a very valuable chemical reagent and an environmentally friendly energy product. Therefore, removal of H2S and producing hydrogen gas using potential catalysts has been intensively studied, according to the equation: H2S(g) + CO(g) → COS(g) + H2(g). In this study, hydrogen sulfide (H2S) decomposition in the presence of CO over transition metal-doped ZSM-12 clusters (TM-ZSM-12) has been investigated based on DFT calculations at the B3LYP-D3/6-31G(d,p) level. The calculation results reveal that the proposed reaction mechanism is controlled by 4 key steps, (i) hydrogen dissociation (Ea1 = +0.04 eV for the 1st hydrogen and Ea2 = +0.22 eV for the 2nd hydrogen), (ii) COS desorption (the rate-determining step of this H2S removal process, Edes = +1.18 eV), (iii) hydrogen diffusion to the transition metal with an energy barrier (Ea3) of +0.62 eV, and (iv) the H2 formation step (Ea4 = +0.94 eV). Our results indicate that in the presence of CO, the Cu–ZSM-12 cluster has a potential application as a highly active catalyst for H2S removal together with hydrogen production.

ศิริพร จึงสุทธิวงษ์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2020-09-21
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  • Physical Chemistry Chemical Physics
    DOI
86 Classification of alcohols obtained by QCM sensors with different characteristics using ABC based neural network Classification of alcohols obtained by QCM sensors with different characteristics using ABC based neural network

Alcohols with different structures are used frequently in hygiene products and cosmetics. It is desirable to classify these alcohols to evaluate their potential harmful effects using less costly methods. In this study, five different types of alcohol are classified using five QCM sensors with different structures. The main idea of the study is to determine the QCM sensor that makes the most successful classification. All the five of the QCM sensors gave successful results, but QCM12-constructed using only NP-was the most successful. ABC-based ANN is used for the classification, and the lowest MSE value in test dataset is obtained as 1.41E−16. The results of 300 different scenarios showed that different alcohols can be classified successfully by using ANN-ABC on the sensor data from QCM12.

ปุริม จารุจำรัส Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2020-06-01
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  • Engineering Science and Technology, an International Journal
    DOI
87 Preparation and characterization of natural rubber bio-based wood adhesive: effect of total solid content, viscosity, and storage time Preparation and characterization of natural rubber bio-based wood adhesive: effect of total solid content, viscosity, and storage time

Natural rubber (NR) grafted by methyl methacrylate (MMA) was used to produce bio-based wood adhesive. The efect of total solid content (%TSC) at 55, 57, and 60%, represented as 55NR-g-MMA, 57NR-g-MMA, and 60NR-g-MMA, respectively, and the efect of storage time on lap shear strength were investigated. It was found that contact angle sharply decreased from 95° for NR to approximately 65° for all of NR-g-MMAs. Because the MMA groups were incorporated into various NRg-MMA samples and the highest relative amount of grafted MMA was obtained by 57-NR-g-MMA which is determined by peaks intensities ratio between wave number at 1725 (C=O stretching) and 1450 (CH2 stretching), investigated by attenuated total refectance Fourier transform infrared spectroscopy (ATR-FTIR). These infuences resulted in an increase in storage modulus (E′), whereas tanδ was decreased as compared to that of NR, characterized by dynamic mechanical analyzer (DMA). In addition, the apparent viscosity performed by plate-and-plate rheometer trended to increase with total solid content and storage time. However, the highest lap shear strength was achieved by 57NR-g-MMA. It means that the lap shear strength was not only governed by viscosity as well as total solid content, but the amount of grafted MMA also plays an important role.

ศิริวัฒน์ ระดาบุตร Q2 นานาชาติ
    วันที่ตีพิมพ์
  • 2020-05-01
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  • Polymer Bulletin
    DOI
88 Theoretical Mecchanistic study of Co Catalytic Oxidation by O2 on an Ultra-Small 13-Atom Bimetalliic Ag7Au6 Cluster Theoretical Mecchanistic study of Co Catalytic Oxidation by O2 on an Ultra-Small 13-Atom Bimetalliic Ag7Au6 Cluster

We report an advanced configurational sampling method that uses density functional theory (DFT) to design a highly active catalyst for conversion of CO into less-harmful products, under ambient conditions. The reaction pathway for CO oxidation by O2 on ultra-small 13-Atom bimetallic Ag7Au6 cluster has two possible mechanisms, namely, stepwise adsorption and co-adsorption. The rate-determining step involving with COeO association via a co-adsorption process shows a significantly small barrier of 0.21 eV. Furthermore, microkinetic simulation results suggest that CO oxidation rates and the optimal temperature for CO oxidation exhibit both greater performances for the co-adsorption pathway, compared to that for a stepwise-adsorption mechanism. Our new proposed mechanism suggests that the bimetallic Ag7Au6 catalyst is active for CO oxidation at room temperatures. Thus, it has potential application as a highly-active catalyst for conversion of carbon monoxide into less toxic CO2.

ศิริพร จึงสุทธิวงษ์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2020-04-05
    ชื่อวารสาร
  • Applied Catalysis A: General
    DOI
89 An ultrasensitive immunosensor based on manganese dioxide-graphene nanoplatelets and core shell Fe3O4@Au nanoparticles for label-free detection of carcinoembryonic antigen An ultrasensitive immunosensor based on manganese dioxide-graphene nanoplatelets and core shell Fe3O4@Au nanoparticles for label-free detection of carcinoembryonic antigen อัญชลี สำเภา Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2020-04-01
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  • Bioelectrochemistry
90 High coverage H2O adsorption on CuAl2O4 surface: A DFT study High coverage H2O adsorption on CuAl2O4 surface: A DFT study

Investigation into the interaction between water and surface is important for many reactions. Periodic DFT calculations were performed to investigate the adsorption of nH2O (n = 1–8) on the CuAl2O4 (1 0 0) and (1 1 0) surfaces. The results show that single water molecule is adsorbed on the CuAl2O4 (1 0 0) and (1 1 0) surfaces via dissociative adsorption with adsorption energies of −103 and −170 kJ/mol. On O-defective CuAl2O4 surfaces, the O atom of the water molecule prefers to insert into the O vacancy, leaving two isolated H atoms bonds to surface O atoms forming two in-surface hydroxyls. For nH2O (n = 2–8) on CuAl2O4 surfaces, molecular and dissociative water adsorption can coexist. The interaction of H2O with CuAl2O4 (1 1 0) surface is much stronger than with the (1 0 0) surface. The PDOS analysis revels that the adsorption of water on the surfaces is accompanied by charge transfer. Water adsorption on the CuAl2O4 surfaces leads to the decreases of the work function at low water coverage, while higher water coverage results in the increase of the work function. The phase diagrams of the water adsorption on the CuAl2O4 spinel surfaces show that water will desorb from the CuAl2O4 surfaces at higher temperature and lower H2O pressure.

ศิริพร จึงสุทธิวงษ์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2020-03-30
    ชื่อวารสาร
  • Applied Surface Science
91 Novel paper‐based colorimetric immunoassay (PCI) for sensitive and specific detection of salbutamol residues in flesh of swine and urine using Ag3PO4/Ag nanocomposite as label Novel paper‐based colorimetric immunoassay (PCI) for sensitive and specific detection of salbutamol residues in flesh of swine and urine using Ag3PO4/Ag nanocomposite as label

Salbutamol (SAL) can cause potential hazards to human health and its use as a growth promoter in meatproducing animals is illegal. This work reports a novel approach for competitive paper-based colorimetric immunoassay (PCI) using the Ag3PO4/Ag nanocomposite as label for sensitive and specific determination of SAL in flesh of swine and urine. The Ag3PO4/Ag nanocomposite was synthesized by a one-step chemical bath method, which could instantly oxidize a chromogenic substrate for the color development under acidic conditions without the participation of H2O2. This approach provides high affinity between the Ag3PO4/Ag nanocomposite and the substrate (with the Michaelis– Menten constant of 0.44 mM). In addition, the fabrication process of the PCI was simple and cost-effective. Particularly, the novel PCI also exhibits simplicity and cost-effectiveness of the fabrication process through a simple wax screenprinting, which requires inexpensive equipment and material including a screen, wax, a squeegee, and a hair dryer. Under optimal conditions, the competitive PCI exhibited a linearity range of 0.025 to 1.00 µg/L. The developed approach offers advantages over the conventional ELISA for the purpose of routine use because it requires a shorter incubation time (<1 hr), significantly small volumes of reagents and samples (<100 µL each), and an inexpensive consumer-grade digital camera coupled with a simple gray-scale transformation of the RGB (Red Green Blue) color image for the purpose of quantification of the detection.

ปุริม จารุจำรัส Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2020-01-01
    ชื่อวารสาร
  • Journal of Food Science
92 0 0

We investigated metal-free dyes based on isoindigo by performing density functional theory and Time-dependent density functional theory calculations to improve the efficiency of dye-sensitized solar cells. The D–p¢–A¢–p–A organic dyes (TIDP and TIDT) used triphenylamine as donor, thiophene as the p¢-linker between the donor and auxiliary acceptor, and a phenyl or thiophene ring as the p-linker between the auxiliary acceptor and acceptor. TIDP and TIDT exhibit good charge-transfer properties. The TIDP-based device provides better device performance with a PCE of 4.11%. Calculated results reveal that the phenyl ring directly linking the auxiliary acceptor and acceptor causes a small tilt angle in the TiO2–adsorped dye, resulting in enhanced electroninjection rates, more efficient packing of adsorbed dye molecules, and slow charge recombination at the TiO2 surface. The performance of the TIDT-based device (g = 2.46%), arises from decreased electron-injection rates and fast charge recombination caused by the large dihedral angle of the adsorbed dye. This research identifies a potential p¢-linker group and reveals the influence of the p-linker on photovoltaic performance in organic dyes.

ศิริพร จึงสุทธิวงษ์ Q2 นานาชาติ
    วันที่ตีพิมพ์
  • 2020-01-01
    ชื่อวารสาร
  • Journal of ELECTRONIC MATERIALS
93 A new environment-friendly supramolecular solvent-based liquid phase microextraction coupled to high performance liquid chromatography for simultaneous determination of six phenoxy acid herbicides in water and rice samples A new environment-friendly supramolecular solvent-based liquid phase microextraction coupled to high performance liquid chromatography for simultaneous determination of six phenoxy acid herbicides in water and rice samples

A green supramolecular solvent (SUPRAS) has been ex situ synthesized and used as the extraction solvent for liquid phase microextraction (LPME) for six phenoxy acid herbicides including 2,4-dichlorophenoxyacetic acid (2,4-D), 2-methyl-4-chlorophenoxyacetic acid (MCPA), 2-(2,4-dichlorophenoxy)propanoic acid (Dichloprop), 2-(4-Chloro-2-methylphenoxy) propanoic acid (Mecoprop), 4-(2,4-dichlorophenoxy)butanoic acid (2,4-DB) and 4-(4-Chloro-2-methylphenoxy) butanoic acid (MCPB) before their analysis by HPLC. The SUPRAS was generated from the aggregation of sodium dodecyl sulfate (SDS) and tetrabutylammonium bromide (TBABr) at the molar ratio of 1:4, in the presence of AlCl3 at ambient temperature. The synthesized SUPRAS was found to be stable for at least one month and a single prepared batch can be used for extraction of 12 samples. The optimum conditions for the extraction were 20 µL of SUPRAS, 3.5% (w/v) of AlCl3, vortex for 20 s and centrifugation at 6000 rpm for 1 min. The micro-volume extraction phase was settled at the narrow bottom of the centrifugation tube allowing easy collection without any special equipment required, providing high efficiency and reproducibility for HPLC analysis. Under the optimum conditions, the method provided the enhancement factor of 37–149 with the limits of detection in the range of 1–2 µg L − 1. A modified quick, easy, cheap, effective, rugged, and safe (QuEChERS) was used for rice sample preparation before extraction and analysis by HPLC. The proposed method was successfully applied for the analysis of the studied herbicides in water and rice samples with the good percentage recovery ranged from 81–110 and 81–108, respectively.

เกษริน สีบุญเรือง Q2 นานาชาติ
    วันที่ตีพิมพ์
  • 2020-01-01
    ชื่อวารสาร
  • Microchemical Journal
94 Aspertamarinolides A-C: gamma-butenolides from the marine-derived fungus Aspergillus tamarii PSU-MF90 Aspertamarinolides A-C: gamma-butenolides from the marine-derived fungus Aspergillus tamarii PSU-MF90

Three new γ-butenolides, aspertamarinolides A-C, were isolated from the marine-derived fungus Aspergillus tamarii PSU-MF90. Their structures with absolute configurations were elucidated by spectroscopic techniques, electronic circular dichroism (ECD) calculations and specific rotations. A plausible biosynthetic pathway for the isolated γ-butenolides was also proposed

ศิริพร จึงสุทธิวงษ์ Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2020-11-12
    ชื่อวารสาร
  • TETRAHEDRON LETTERS
95 Mechanistic and thermodynamic insights into the deoxygenation of palm oils using Ni2P catalyst: A combined experimental and theoretical study Mechanistic and thermodynamic insights into the deoxygenation of palm oils using Ni2P catalyst: A combined experimental and theoretical study

Deoxygenation (DX) is a key enhancement process for biomass-derived biofuel production. To understand the DX mechanism of palm oils, we performed experimental and computational studies to investigate the DX reaction of palmitic acid on Ni2P catalyst. Experimental characterization and catalytic testing demonstrated that the DX on unsupported (0 0 1)-Ni2P catalyst prefers the decarbonylation (DCO) pathway over the hydrodeoxygenation (HDO) pathway with the ratios between 2.17 and 4.13 to 1. Mechanistic study using density functional theory calculation revealed that the DX of butyric acid also prefers DCO over HDO pathway. Both experimental and computational results suggested that the decarboxylation (DCO2) pathway is unlikely. The computation results indicated that the rate-limiting step of HDO pathway is in the butanol to butane conversion (activation energy E-a = 1.99 eV), whereas that of the DCO pathway is found during the butanal to propane conversion (E-a = 1.52 eV). However, additional thermodynamic analysis accounting for hydrotreating reaction condition (H-2 = 50 bars at 653 K) suggested that the rate-determining step for the DCO pathway is actually the hydrogenation of butyric acid. In addition, the thermodynamics analysis also suggests that increasing reaction temperature may increase selectivity of HDO pathway. The mechanistic insights gained from this study will be beneficial for the enhancement of DX process for biofuel production.

ศิริพร จึงสุทธิวงษ์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2020-11-01
    ชื่อวารสาร
  • CHEMICAL ENGINEERING JOURNAL
96 Comparison of microwave-assisted and thermal-heated synthesis of P(HEMA-co-AM)/PVA interpenetrating polymer network (IPN) hydrogels for Pb(II) removal from aqueous solution: Characterization, adsorption and kinetic study Comparison of microwave-assisted and thermal-heated synthesis of P(HEMA-co-AM)/PVA interpenetrating polymer network (IPN) hydrogels for Pb(II) removal from aqueous solution: Characterization, adsorption and kinetic study

This work aims to compare the properties and Pb(II) adsorption abilities of the interpenetrating polymer network (IPN) hydrogels of poly(2-hydroxyethyl methacrylate-co-acrylamide)/poly(vinyl alcohol), (P(HEMA-co-AM)/PVA), prepared by microwave-assisted (IPN-MW) and conventionally thermal-heated (IPN-TH) processes for evaluating the suitable and economic method. The results revealed that the microwave-assisted synthesis is not only greatly shorten the reaction time in just 10 min but also markedly improves the porosity and crosslink networks. Consequently, the water swelling (1310%), Young’s modulus (351 MPa) and tensile strength (18.6 MPa) of IPN-MW films were significantly higher than those of IPN-TH film (620%, 224 MPa and 8.4 MPa, respectively). The relationship between Pb(II) adsorption capacity and initial concentration (Co) of IPN-MW and IPN-TH hydrogels showed a good linearity described by; qeq (IPN-MW) (mg/g) = 0.28Co(ppm), R2 = 0.995 and qeq (IPN-TH) (mg/g) = 0.07Co(ppm), R2 = 0.986, respectively. The maximum Pb(II) adsorption capacity on IPN-MW adsorbent (292.5 mg/g) was 4.51 folds higher than IPN-TH hydrogel (64.8 mg/g). The adsorption kinetics on both hydrogels fitted well to the pseudo-first-order kinetics and Freundlich isotherm. The overall results indicate that the microwave-assisted synthesis is a promising and effective method for synthesis of P(HEMA-co-AM)/PVA IPN hydrogel as an effective adsorbent for removing of heavy metal ions in various aqueous solutions.

สายันต์ แสงสุวรรณ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-01-15
    ชื่อวารสาร
  • European Polymer Journal
97 A portable selective electrochemical sensor amplified with Fe3O4@Au-cysteamine-thymine acetic acid as conductive mediator for determination of mercuric ion A portable selective electrochemical sensor amplified with Fe3O4@Au-cysteamine-thymine acetic acid as conductive mediator for determination of mercuric ion

Mercury ion (Hg2+) is considered to be one of the most toxic heavy metal ions and can cause adverse effects on kidney function, the central nervous system, and the immune system. Therefore, it is important to develop a fast and simple method for sensitive and selective detection of Hg2+ in the environment. This research proposes a portable electrochemical sensor for rapid and selective detection of Hg2+. The sensor platform is designed based on thymine acetic acid anchored with cysteamine-conjugated core shell Fe3O4@Au nanoparticles (Fe3O4@Au/CA/T-COOH) immobilized on a sensing area of a screen-printed carbon electrode (SPCE) with the aid of an external magnetic field embedded in a homemade electrode holder for ease of handling. In the presence of Hg2+, the immobilized thymine combines specifically with Hg2+ and forms a thymine-Hg2+-thymine mismatch (T-Hg2+-T). The resulting amount of Hg2+ was determined by differential pulse anodic stripping voltammetry (DPASV). Under optimal conditions, the sensor exhibited two wide linearities in a range from 1 to 200 μg L−1 and 200–2200 μg L−1 with the reliability coefficient of determination of 0.997 and 0.999, respectively. The detection limit (LOD) and the quantification limit (LOQ) were also determined to be 0.5 μg L−1 and 1.0 μg L−1, respectively. The sensor was further applied for determination of Hg2+ in water samples, a certified reference material and fish samples. The results were compared with flow injection atomic spectroscopy-inductively coupled plasma-optical emission spectroscopy (FIAS-ICP-OES) systems as a reference method. Results obtained with the proposed sensor were relatively satisfactory, and they showed no significant differences at a 95% confidence level by t-test from the standard method. Therefore, considering its fast and simple advantages, this novel strategy provides a potential platform for construction of a Hg2+ electrochemical sensor.

อัญชลี สำเภา Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-01-01
    ชื่อวารสาร
  • Talanta
98 Biodegradable hydrogels of cassava starch-g-polyacrylic acid/natural rubber/polyvinyl alcohol as environmentally friendly and highly efficient coating material for slow-release urea fertilizers Biodegradable hydrogels of cassava starch-g-polyacrylic acid/natural rubber/polyvinyl alcohol as environmentally friendly and highly efficient coating material for slow-release urea fertilizers

Biodegradable semi-IPN hydrogels of cassava starch (CSt)-g-polyacrylic acid (PAA)/natural rubber (NR)/polyvinyl alcohol (PVA) at different NR/PVA ratios were developed as low-cost coating membrane for improving slow-released fertilizer with low negative impact on environments. The effect of NR/PVA ratios on mechanical properties, swelling behavior, water retention and biodegradation of the semi-IPN hydrogels was evaluated. The biodegradable hydrogel wax coated urea (BHWCU) was produced by coating urea particles with semi-IPN hydrogel and wax as inner and outer layers, respectively. Results revealed that the higher NR/PVA ratios caused the significant decrease in water swelling, modulus, water-retention and biodegradation of the hydrogels. The BHWCU/9:1 formulation exhibited an excellent slow-release N nutrient in both water (47.5% at 168 h) and soil (38.5% at 30 day), relating well with the lowest surface area (1.95 m2/g) and pore volume (3.75 × 10−3 cm3/g). The release kinetics of BHWCUs in both water and soil followed the Korsmeyer-Peppas model. The released nutrient from the BHWCU/9:1 was strongly depended on the pH, temperature and ionic strength. The growth of chili plant was effectively facilitated by the BHWCU/9:1 having 4–5 times lower production cost (80.36 Baht/kg) than commercial slow-release fertilizer. Thus, the BHWCU formulations could be extensively applicable in sustainable agriculture.

สายันต์ แสงสุวรรณ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-09-25
    ชื่อวารสาร
  • Journal of Industrial and Engineering Chemistry
99 Theoretical insights into catalytic CO2 hydrogenation over single-atom (Fe or Ni) incorporated nitrogen-doped graphene Theoretical insights into catalytic CO2 hydrogenation over single-atom (Fe or Ni) incorporated nitrogen-doped graphene

Developing highly efficient and cheap catalysts for the CO2 hydrogenation is the key to achieve CO2 conversion into clean energy. Herein, periodic density functional theory (DFT) calculations are performed to investigate possible reaction mechanisms for the hydrogenation of CO2 to formic acid (cis- or trans-HCOOH) product over a single Fe or Ni atom incorporated nitrogen-doped graphene (Fe-N3Gr or Ni-N3Gr) sheets. Our calculations found that the CO2 hydrogenation proceeds via a coadsorption mechanism to produce cis- or trans-HCOOH over Fe-N3Gr and Ni-N3Gr surfaces, which is classified into 2 steps: (1) the CO2 hydrogenation to form a formate (HCOO*) intermediate and (2) hydrogen abstraction to produce cis- or trans-HCOOH. The formation of trans-HCOOH over both Fe-N3Gr and Ni-N3Gr surfaces exhibit the obvious superiority due to the low barrier all through the whole channel. The highest energy barriers (Ea) in the case of trans-HCOOH formation on Fe-N3Gr and Ni-N3Gr surfaces are only 0.57 and 0.37 eV, respectively, which indicated that the CO2 hydrogenation to trans-HCOOH could be realized over these catalysts at low temperatures, especially the Ni-N3Gr surface. On the other hand, our findings show that the competitive reaction that produces CO and H2O is almost impossible or extremely difficult to proceeds under ambient conditions due to the large Ea for the formation of these side products. Moreover, the microkinetic modeling of the CO2 hydrogenation on both surfaces was investigated to confirm these results. Thus, the Fe-N3Gr and Ni-N3Gr catalysts reveal excellent catalytic activity and highly selective for CO2 hydrogenation to trans-HCOOH. This theoretical investigation not only provides a promising catalyst but also gives a deeper understanding of CO2 hydrogenation reaction.

ศิริพร จึงสุทธิวงษ์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-06-01
    ชื่อวารสาร
  • Journal of CO2 Utilizatio
    DOI
100 Novel dual-sensor for creatinine and 8-hydroxy-2'-deoxyguanosine using carbon-paste electrode modified with molecularly imprinted polymers and multiple-pulse amperometry Novel dual-sensor for creatinine and 8-hydroxy-2'-deoxyguanosine using carbon-paste electrode modified with molecularly imprinted polymers and multiple-pulse amperometry

We present a novel amperometric dual-imprinted sensor for simultaneous determination of creatinine (Cre) and 8-hydroxy-2′-deoxyguanosine (8-OHdG) in human urine and serum. The sensor used multiple-pulse amperometric detection in flow injection analysis (MPA-FIA). Copper oxide nanoparticles were coated with the Cre molecularly-imprinted polymer (CuO@MIP), using methacrylic acid as the functional monomer and N, N′-(1,2-dihydroxyethylene) bis-acrylamide as cross-linker. For 8-OHdG sensing, we embedded platinum nanoparticles in reduced graphene oxide and then coated it with guanosine poly-dopamine MIP (PtNPs-rGO@MIP). A carbon-paste electrode (CPE) was then formed containing both nanocomposites to give the dual MIP sensor (CuO@MIP and PtNPs-rGO@MIP/CPE). We developed a dual-potential waveform as a function of time, with Edet.1 (+0.4 V/150 ms) to determine Cre selectively and Edet.2 (+0.6 V/250 ms) to analyze both compounds simultaneously (Cre and 8-OHdG). Subtracting the two signals at 0.6 V and 0.4 V (using a correction factor), respectively, from each other allowed for quantifying 8-OHdG without interference from Cre. The MIP sensor has a linear range of 0.5–150 μM for creatinine and 0.005–50 μM for 8-OHdG, with limits of detection in nano-molar level. The proposed method is successfully applied for the simultaneous determination of Cre and 8-OHdG in urine and serum samples.

มะลิวรรณ อมตธงไชย Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-05-01
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  • Sensors and Actuators B: Chemical
101 Metal-doped carbon nanocones as highly efficient catalysts hydrogen storage: Nuclear quantum effect on hydrogen spillover mechanism Metal-doped carbon nanocones as highly efficient catalysts hydrogen storage: Nuclear quantum effect on hydrogen spillover mechanism

We investigated H-spillover mechanisms on Pt atoms decorating defective carbon nanocones (Pt/dCNC) using the multicomponent B3LYP (MC_B3LYP) method, which can take account of the nuclear quantum effect (NQE) of light nuclei. MC_B3LYP shows reduced relative energies for all stationary-point structures and lower energy barriers to H-spillover reactions. Interestingly, MC_B3LYP calculations reveal that the activation energy for H2 dissociation completely vanishes indicating that H2 molecules dissociate readily on Pt/dCNC. Our crucial finding is that the different metal (Pt and Pd) on dCNC surface has affected the thermodynamic favorability of the hydrogen dissociation process, on Pt/dCNC is facile and highly exothermic, while on Pd/dCNC is dramatically endothermic. Furthermore, comparison of combined dissociation-spillover mechanism on Pt decorated on carbon nanocone (Pt/dCNC) and Pt decorated on graphene (Pt/dG) catalysts have been focused to explain the curvature effect which can facilitate the hydrogen spillover process and provide a highly exothermic reaction, which is more thermodynamically favorable than that of a metal-graphene surface. Our new understanding of this reaction mechanism and the influence of NQEs on electronic properties will be useful for the future development of the spillover mechanism as well as the synthesis of high-performance Pt/dCNC for H2 energy applications.

ศิริพร จึงสุทธิวงษ์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-03-01
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  • Molecular Catalysis
102 Mimicking Peroxidase-Like Activity of Nitrogen-Doped Carbon Dots (N-CDs) Coupled with a Laminated Three-Dimensional Microfluidic Paper-Based Analytical Device (Laminated 3D-μPAD) for Smart Sensing of Total Cholesterol from Whole Blood Mimicking Peroxidase-Like Activity of Nitrogen-Doped Carbon Dots (N-CDs) Coupled with a Laminated Three-Dimensional Microfluidic Paper-Based Analytical Device (Laminated 3D-μPAD) for Smart Sensing of Total Cholesterol from Whole Blood

This work presents a simple hydrothermal synthesis of nitrogen-doped carbon dots (N-CDs), fabrication of microfluidic paper-based analytical device (μPAD), and their joint application for colorimetric determination of total cholesterol (TC) in human blood. The N-CDs were characterized by various techniques including transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and X-ray powder diffraction (XRD), and the optical and electronic properties of computational models were studied using the time-dependent density functional theory (TD-DFT). The characterization results confirmed the successful doping of nitrogen on the surface of carbon dots. The N-CDs exhibited high affinity toward 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid)-diammonium salt (ABTS) with the Michaelis–Menten constant (KM) of 0.018 mM in a test for their peroxidase-like activity. Particularly, since hydrogen peroxide (H2O2) is the oxidative product of cholesterol in the presence of cholesterol oxidase, a sensitive and selective method of cholesterol detection was developed. Overall, the obtained results from TD-DFT confirm the strong adsorption of H2O2 on the graphitic N positions of the N-CDs. The laminated three-dimensional (3D)-μPAD featuring a 6 mm circular detection zone was fabricated using a simple wax screen printing technique. Classification of TC according to the clinically relevant criteria (healthy, <5.2 mM; borderline, 5.2–6.2 mM; and high risk, >6.2 mM) could be determined by the naked eye within 10 min by simple comparison using a color chart. Overall, the proposed colorimetric device serves as a low-cost, rapid, simple, sensitive, and selective alternative for TC detection in whole blood samples that is friendly to unskilled end users.

ปุริม จารุจำรัส Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-04-18
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  • Analytical Chemistry
103 Microstructural characterization of white charcoal for rapid reduction of chemical oxygen demand and automatically adjust pH to neutral in wastewater treatment Microstructural characterization of white charcoal for rapid reduction of chemical oxygen demand and automatically adjust pH to neutral in wastewater treatment

The purpose of this study was to produce, characterize and apply white and black charcoal for wastewater treatment application. Characterization of charcoals, the results confirmed that white charcoal had higher thermal stability and carbon content than black charcoal. The other elemental analysis results showed that both black and white charcoal show the highest intensity of potassium content. The surface of black charcoal was rougher than the surface of white charcoal. The morphology from scanning electron microscope coupled with Energy Dispersive X-ray Spectrophotometer (SEM-EDS) images demonstrated white charcoal shows a highly porous material, especially coconut shell white charcoal with small holes connected to large holes. X-ray diffraction patterns (XRD) showed peak patterns of graphite. The specific surface area, total pore volume, and pore size of all charcoal were evaluated by the BET method. This result was a higher specific surface area of white charcoal than black charcoal. The coconut shell white charcoal had the highest specific surface area (458.80 m 2/g). All charcoals had an average pore size in the range from 1 to 2 nm, all charcoals had an average pore size in the range from 1 to 2 nm which was microporous materials. Both black and white charcoal were used as an adsorbent for the wastewater treatment from a chemistry laboratory building. The results indicated that white charcoal could neutralize the pH of wastewater after treatment in both acidity and alkalinity wastewater. After treatment, wastewater treated with white charcoal shows a higher level of %COD reduction than wastewater treated with black charcoal.

นุชนาพร พิจารณ์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-07-01
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  • Journal of Materials Research and Technology
104 In situ self-assembled coating of surfactant-mixed metal hydroxide on Fe3O4@SiO2 magnetic composite for dispersive solid phase microextraction prior to HPLC analysis of triazole fungicides In situ self-assembled coating of surfactant-mixed metal hydroxide on Fe3O4@SiO2 magnetic composite for dispersive solid phase microextraction prior to HPLC analysis of triazole fungicides

A new approach for the determination of five triazole fungicides, i.e. triadimefon, flusilazole, tebuconazole, penconazole and propiconazole, in water samples has been developed. The developed method was based on a self-assembled coating of surfactant-mixed metal hydroxide on Fe3O4@SiO2 magnetic composite. The resulting coated nanocomposite was directly used as an efficient sorbent in dispersive solid phase microextraction of the triazole fungicides. As an in-situ process, surface modification of the sorbent and extraction of the triazole fungicides were accomplished together. Also, the combined unique properties of the composite sorbent exhibited superior performance in terms of high separation and extraction efficiency. After the studied extraction, the extracted triazole fungicides were separated and quantified using high performance liquid chromatographic analysis. The parameters for the optimum extraction condition were 100 mL sample volume, 20 mg of Fe3O4@SiO2 sorbent, 10 mg of sodium dodecyl sulfate, 0.738 g of Mg(NO3)2, 0.36 g of Al(NO3)3, 1 g of NaCl, pH 10, 10 min of extraction time and 6 mL of acetonitrile as desorption solvent. Under the optimized condition, the linearity was obtained in the range of 5–100 µg L−1 for triadimefon and 2.5–50 µg L−1 for flusilazole, tebuconazole, penconazole and propiconazole. The obtained limits of detection were 1.0–2.5 μg L−1. High precision (the intra–day and inter–day precision) was achieved with the relative standard deviation of less than 8%. The enhancement factors ranged from 40 to 237. The proposed extraction was successfully applied for the analysis of the triazole fungicides in water samples with good recovery in the range of 90–104%.

เกษริน สีบุญเรือง Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-05-13
    ชื่อวารสาร
  • Microchemical Journal
105 Formic acid dehydrogenation over single atom Pd-deposited carbon nanocones for hydrogen production: a mechanistic DFT study Formic acid dehydrogenation over single atom Pd-deposited carbon nanocones for hydrogen production: a mechanistic DFT study

A single palladium (Pd) atom embedded in a high curvature defective carbon nanocone (Pd/dCNC) is investigated for formic acid (FA) decompositions using DFT calculations. We used Pd/dCNC as the catalyst for either trans-FA or cis-FA decomposition. FA is stably adsorbed on Pd/dCNC with very high adsorption energy compared to the Pd/dG surface. For the reaction mechanisms, the preferable FA dehydrogenation mechanisms proceed via the formate pathway, with a rate-determining step of only 0.50 eV (trans-FA) and 0.54 eV (cis-FA), which are less than that on active Pd (111) catalysts. The rate of hydrogen (H2) production is dependent on the FA concentration. The active neighboring C atom plays a significant role in facilitating FA dehydrogenation into H2. The side reaction producing CO and H2O via the formyl or carboxyl pathway cannot occur on Pd/dCNC due to a high energy-barrier and low production rate obtained by microkinetic simulations. Thus, our proposed catalysts effectively provide excellent activity and selectivity for FA dehydrogenation into H2.

ศิริพร จึงสุทธิวงษ์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-06-10
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  • Molecular Systems Design & Engineering
106 Theoretical insights into catalytic CO2 hydrogenation over single-atom (Fe or Ni) incorporated nitrogen-doped graphene Theoretical insights into catalytic CO2 hydrogenation over single-atom (Fe or Ni) incorporated nitrogen-doped graphene

Developing highly efficient and cheap catalysts for the CO2 hydrogenation is the key to achieve CO2 conversion into clean energy. Herein, periodic density functional theory (DFT) calculations are performed to investigate possible reaction mechanisms for the hydrogenation of CO2 to formic acid (cis- or trans-HCOOH) product over a single Fe or Ni atom incorporated nitrogen-doped graphene (Fe-N3Gr or Ni-N3Gr) sheets. Our calculations found that the CO2 hydrogenation proceeds via a coadsorption mechanism to produce cis- or trans-HCOOH over FeN3Gr and Ni-N3Gr surfaces, which is classified into 2 steps: (1) the CO2 hydrogenation to form a formate (HCOO*) intermediate and (2) hydrogen abstraction to produce cis- or trans-HCOOH. The formation of transHCOOH over both Fe-N3Gr and Ni-N3Gr surfaces exhibit the obvious superiority due to the low barrier all through the whole channel. The highest energy barriers (Ea) in the case of trans-HCOOH formation on Fe-N3Gr and Ni-N3Gr surfaces are only 0.57 and 0.37 eV, respectively, which indicated that the CO2 hydrogenation to trans-HCOOH could be realized over these catalysts at low temperatures, especially the Ni-N3Gr surface. On the other hand, our findings show that the competitive reaction that produces CO and H2O is almost impossible or extremely difficult to proceeds under ambient conditions due to the large Ea for the formation of these side products. Moreover, the microkinetic modeling of the CO2 hydrogenation on both surfaces was investigated to confirm these results. Thus, the Fe-N3Gr and Ni-N3Gr catalysts reveal excellent catalytic activity and highly selective for CO2 hydrogenation to trans-HCOOH. This theoretical investigation not only provides a promising catalyst but also gives a deeper understanding of CO2 hydrogenation reaction.

ศิริพร จึงสุทธิวงษ์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-06-01
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  • JOURNAL OF CO2 UTILIZATION
107 Mechanistic insight into catalytic carbon dioxide hydrogenation to formic acid over Pt-doped boron nitride nanosheets Mechanistic insight into catalytic carbon dioxide hydrogenation to formic acid over Pt-doped boron nitride nanosheets

In this work, we investigated the mechanism of CO2 hydrogenation over the Pt-doped boron nitride nanosheets (Pt-BNNSs) by using the density functional theory (DFT). It is found that a Pt adatom can be effectively stabilized in boron vacancy site (Pt-BV). Our investigation shows that the reaction mechanisms of CO2 hydrogenation over Pt-BV can be found in three possible reaction pathways: (i) co-adsorption, (ii) H2 dissociation, and (iii) co-adsorption together with H2 dissociation pathways. The co-adsorption together with H2 dissociation provides the most favorable pathway among of these three proposed mechanisms. The important finding of our study is that the presence of CO2 in step of hydrogen dissociation plays an important role in producing the FA on the Pt-BV catalyst. Moreover, we found that the hydrogenation of CO2 via carboxylate (COOH) has the rate-determining step of 0.63 eV in the step of hydrogen dissociation. In addition, the microkinetic modelling suggests that the COOH route is found to be more energetically and kinetically feasible rather than that it is formate route (HCOO) with the reaction temperature at 350 K and pressure of 5 bar. Our calculation results provide an important information for developing Pt-BV catalysts and might shed light on experimental design the novel Pt-BV catalyst for the CO2 hydrogenation and the conversion of greenhouse gases into value-added products.

ศิริพร จึงสุทธิวงษ์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-06-01
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  • Molecular Catalysis
108 Use of nitrogen-doped amorphous carbon nanodots (N-CNDs) as a fluorometric paper-based sensor: a new approach for sensitive determination of lead(II) at a trace level in highly ionic matrices Use of nitrogen-doped amorphous carbon nanodots (N-CNDs) as a fluorometric paper-based sensor: a new approach for sensitive determination of lead(II) at a trace level in highly ionic matrices

This work reports a facile synthesis of nitrogen-doped amorphous carbon nanodots (N-CNDs) and their use as a fluorometric paper-based sensor for the determination of Pb2+ at a low concentration. Both solution-based and paper-based systems were developed. The results show that the linearity ranges for Pb2+ determination were 0.010–10 mg L−1 (LOD = 0.008 mg L−1) and 0.005–0.075 mg L−1 (LOD = 0.004 mg L−1) for the solution-based and the paper-based sensors, respectively. Furthermore, the developed sensors show relatively high selectivity toward Pb2+ over ten other metal cations of different charges including As3+, Hg2+, Cd2+, Mg2+, Ni2+, Zn2+, Fe3+, Cu2+, Ba2+, and Ag+. The mechanism of Pb2+ determination was also investigated. It was found that the sensors exploited the quenching of the fluorescence intensity of N-CNDs by Pb2+via the photo-induced electron transfer (PET) mechanism. When applied to real water and herbal medicine samples, the performance of the sensor exhibited no significant difference as compared to the results of the validation method (ICP-OES). Overall, the developed sensors, especially the paper-based one, are promising for the practical analysis of Pb2+ in pharmaceutical and environmental samples with a low Pb2+ concentration.

ปุริม จารุจำรัส Q2 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-08-01
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  • Analytical Methods
109 Ionic liquids for high performance lithium metal batteries Ionic liquids for high performance lithium metal batteries

The pursuit of high energy density has promoted the development of high-performance lithium metal batteries. However, it faces a serious security problem. Ionic liquids have attracted great attention due to their high ionic conductivity, non-flammability, and the properties of promoting the formation of stable SEI films. Deeply understanding the problems existing in lithium metal batteries and the role of ionic liquids in them is of great significance for improving the performance of lithium metal batteries. This article reviews the effects of the molecular structure of ionic liquids on ionic conductivity, Li+ ion transference number, electrochemical stability window, and lithium metal anode/electrolyte interface, as well as the application of ionic liquids in Li-high voltage cathode batteries, Li-O2 batteries and Li-S batteries. The molecular design, composition and polymerization will be the main strategies for the future development of ionic liquid-based electrolytes for high performance lithium metal battery.

ศิริพร จึงสุทธิวงษ์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-08-01
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  • Journal of Energy Chemistry
110 Ti4-Decorated B/N-doped graphene as a high-capacity hydrogen storage material: A DFT study Ti4-Decorated B/N-doped graphene as a high-capacity hydrogen storage material: A DFT study

The adsorption properties of the hydrogen atom on our newly designed materials were investigated using density functional theory (DFT) calculations, focusing on the role of dopants in modulating the binding properties of the metal. We proposed decorating Ti4 on pristine, B- and N-doped graphene surfaces for preparing a large-capacity hydrogen-storage device. Computational results indicate that the doping of B on graphene enhances the interaction between the metal cluster and the supporting substrate with a very strong binding energy of −6.45 eV, which is the strongest interaction among our proposed catalysts. This binding energy prevents the aggregation and formation of Ti–metal clusters. Dissociative chemisorption of the first H2 molecule occurs on all materials. Metal hydrides preferentially exhibit strong hybridization between the H-1s and Ti-3d orbitals. Furthermore, Ti4 decorated B-graphene is the most effective, with a high capacity of hydrogen adsorption which could be released under practical conditions. We confirmed that eight H2 molecules could stably adsorb on Ti4/BGr with six reversible hydrogen adsorptions. Our proposed B-doped graphene-based material, Ti4/BGr, offers high cluster-stability on the substrate with high-capacity hydrogen storage compared to various other surfaces in the previous work. Therefore, Ti4 decorated B-graphene is a promising candidate material for use as a reversible hydrogen storage material.  

ศิริพร จึงสุทธิวงษ์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-07-01
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  • Dalton Transactions
111 Antibacterial and Antifungal Polyketides from the Fungus Aspergillus unguis PSU-MF16 Antibacterial and Antifungal Polyketides from the Fungus Aspergillus unguis PSU-MF16

Seven new polyketides including a phenol (1), two diphenyl ethers (2 and 3), two depsidones (4 and 5), and two phthalides (6 and 7) were isolated from the fungus Aspergillus unguis PSU-MF16 along with 27 known compounds. Their structures were determined by extensive spectroscopic analysis. The absolute configurations of 1 and 4–7 were established using comparative analyses of calculated and experimental ECD spectra. Among the new metabolites, 2 exhibited the best antimicrobial activity against Staphylococcus aureus, methicillin-resistant S. aureus, and Microsporum gypseum with equal MIC values of 16 μg/mL. In addition, known emeguisin A displayed potent antimicrobial activity against S. aureus, methicillin-resistant S. aureus, and Cryptococcus neoformans with equal MIC values of 0.5 μg/mL, compared with the standard drugs, vancomycin and amphotericin B. The structure–activity relationship study of the isolated compounds for antimicrobial activity is discussed.

ศิริพร จึงสุทธิวงษ์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-04-16
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  • Journal of Natural Products
112 0 0

We report a novel three-dimensional microfluidic paper-based analytical device (3D-μPAD) with colorimetric detection, using Mn–ZnS quantum dot embedded molecularly imprinted polymer (Mn–ZnS QD-MIP), for selective glyphosate determination in whole grain samples. Detection is based on the catalytic activity of Mn–ZnS QD-MIP in the H2O2 oxidation of ABTS. Glyphosate imprinted polymer is successfully synthesized on the Mn–ZnS QD surface using a poly (N-isopropylacrylamide) (NIPAM) and N, N′-Methylenebisacrylamide (MBA) as the functional monomers. The catalytic activity depends on binding or non-binding of glyphosate molecules on the synthetic recognition sites of the Mn–ZnS QD-MIP. Glyphosate selectively binds to the cavities embedded on the Mn–ZnS QD surface, and subsequently turns-off or inhibits the ABTS oxidation and color change to light green. The change of reaction color from dark green to light green depends on the concentration of glyphosate. We report, for the first time, using the relatively new penguard enamel colour to create a hydrophobic barrier. The foldable 3D-μPAD comprises three layers (top/center/bottom), named as the detection zone, immobilized Mn–ZnS QD-MIP disc, and sample loading. Assay on the 3D-μPAD can determine glyphosate by ImageJ detection, over an operating range of 0.005–50 μg mL−1 and with a detection limit of 0.002 μg mL−1. Our 3D-μPAD exhibits high accuracy, with a 0.4% (intra-day) and 0.7% (inter-day) relative difference from the certified CRM value. Moreover, the fabricated 3D-μPAD provides good reproducibility (1.7% RSD for ten devices). The developed 3D-μPAD was successfully applied to determine the glyphosate concentration in whole grain samples and shows great promise as an alternative highly selective and sensitive colorimetric method. The 3D-μPAD is well suited to food-quality control and onsite environmental-monitoring applications, without sophisticated instrumentation.

มะลิวรรณ อมตธงไชย Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-04-01
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  • Talanta
113 Conjugated Copolymers That Shouldn't Be Conjugated Copolymers That Shouldn't Be

Multiple studies have explored using cage silsesquioxanes (SQs) as backbone elements in hybrid polymers motivated by their well-defined structures and physical and mechanical properties. As part of this general exploration, we report unexpected photophysical properties of copolymers derived from divinyl double decker (DD) SQs, [vinyl(Me)Si(O0.5)2][PhSiO1.5]8[(O0.5)2Si(Me)vinyl] (vinylDDvinyl). These copolymers exhibit strong emission red-shifts relative to model compounds, implying unconventional conjugation, despite vinyl(Me)Si(O-)2 siloxane bridges. In an effort to identify minimum SQ structures that do/do not offer extended conjugation, we explored Heck catalyzed co-polymerization of vinyl-ladder(LL)-vinyl compounds, vinyl(Me/Ph)Si(O0.5)2[PhSiO1.5]4(O0.5)2Si(Me/Ph)vinyl, with Br-Ar-Br. Most surprising, the resulting oligomers show 30–60 nm emission red-shifts beyond those seen with vinylDDvinyl analogs despite lacking a true cage. Further evidence for unconventional conjugation includes apparent integer charge transfer (ICT) between LL-co-thiophene, bithiophene, and thienothiophene with 10 mol % F4TCNQ, suggesting potential as p-type doped organic/inorganic semiconductors.

ศิริพร จึงสุทธิวงษ์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-02-25
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  • Angewandte Chemie - International Edition
114 Composite proton conducting membranes from chitosan, poly(vinyl alcohol) and sulfonic acid-functionalized silica nanoparticles Composite proton conducting membranes from chitosan, poly(vinyl alcohol) and sulfonic acid-functionalized silica nanoparticles

Composite proton conducting membranes were successfully synthesized from chitosan, poly (vinyl alcohol) and sulfonic acid-functionalized silica nanoparticles. Sulfosuccinic acid (SSA) and glutaraldehyde were used as double crosslinking agents, where the effect of SSA content on membrane properties, including water vapor absorption, water uptake, ion exchange capacity, and proton conductivity was investigated and were found to increase as a function of SSA loading. The most promising membrane was then formed into a composite with either silica nanoparticles containing poly (2-acrylamido-2-methyl-1-propanesulfonic acid) (PAMPS-Si) or poly (styrene sulfonic acid) (PSSA-Si). PAMPS-Si and PSSA-Si were characterized by thermogravimetric analysis (TGA), transmission electron microscopy (TEM), and Fourier transform infrared spectroscopy (FTIR). The effects of nanoparticle loading and polymer shell on membrane properties were studied. Proton conductivity increased at higher nanoparticle loadings, and reached a maximum of 3.8–3.9 × 10−3 S/cm at 20% loading. The influence of polymer shell on membrane properties was not significantly observed.

ประนอม แซ่จึง Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-01-06
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  • International Journal of Hydrogen Energy
115 Rational design of anthracene-based deep-blue emissive materials for highly efficient deep-blue organic light-emitting diodes with CIEy ≤ 0.05 Rational design of anthracene-based deep-blue emissive materials for highly efficient deep-blue organic light-emitting diodes with CIEy ≤ 0.05

By using molecular twisting 2,2′-dimethylbiphenyl core and different side group substitutions, three anthracene-based deep blue emitters, 10,10'-(2,2′-dimethyl-[1,1′-biphenyl]-4,4′-diyl)bis(9-phenylanthracene) (PABP), 10,10'-(2,2′-dimethyl-[1,1′-biphenyl]-4,4′-diyl)bis(9-(naphthalen-2-yl)anthracene) (βNABP) and 10,10'-(2,2′-dimethyl-[1,1′-biphenyl]-4,4′-diyl)bis(9-(naphthalen-1-yl)anthracene) (αNABP), were effectively developed. These three twisted anthracene derivatives exhibited strong deep blue photoluminescence which remarkably surpassed the standard blue for the high-definition television (HDTV). Particularly, PABP with high hole mobility of 1.67 × 10−5 cm2 V−1 s−1 delivered a high OLED device performance with external quantum efficiency (EQE) of 4.04% and deep blue emission colour with CIE coordinates of (0.15, 0.05).

ศิริพร จึงสุทธิวงษ์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-01-01
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  • Dyes and Pigments
116 Oxygen-deficient bismuth molybdate nanocatalysts: Synergistic effects in boosting photocatalytic oxidative coupling of benzylamine and mechanistic insigt Oxygen-deficient bismuth molybdate nanocatalysts: Synergistic effects in boosting photocatalytic oxidative coupling of benzylamine and mechanistic insigt

Herein, bismuth molybdate (Bi2MoO6) nanocatalysts containing oxygen vacancies (OVs) are found to considerably promote the photocatalytic performance toward oxidative coupling of benzylamine to N-benzylidenebenzylamine under visible light irradiation. The structure-activity relationship for this interesting catalyst is revealed for the first time. The oxygen-deficient Bi2MoO6 nanoplatelets (BMO-NPs) are synthesized using ethylene glycol-ethanol solvent mixture as a reaction medium in solvothermal method. A comparison with hydrothermally prepared Bi2MoO6 square-like sheets (BMO-SHs) suggests that the nanoplatelets are much smaller in size and contain higher amount of OVs. Benzylamine conversion over the BMO-NPs is ca. 4.0 times higher than that over the BMO-SHs and ca. 3.8 and ca. 34.6 times higher than that over the commercial benchmark TiO2 P25 and BiVO4 catalysts, respectively. The BMO-NPs achieve more than 80% product yield within 2 h of irradiation regardless of substituents of benzylamine derivatives. The enhanced activity of BMO-NPs is due to synergistic roles of high surface-to-volume ratio and OVs, providing enlarged active area, extended light absorption range and improved charge separation and transfer efficiency as evidenced from UV–vis DRS, BET surface area, photocurrent response, electrochemical impedance spectroscopy, and time-resolved fluorescence decay measurements. EPR-trapping and radical scavenging experiments indicate O2− as a main active species rather than 1O2 and a plausible imine formation mechanism via O2−-assisted charge transfer is proposed accordingly. The work offers an alternative facile preparation method to design efficient semiconductor photocatalysts and for the first time reveals a possible benzylamine coupling mechanism over the oxygen-deficient Bi2MoO6 nanocatalyst.

ศิริพร จึงสุทธิวงษ์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-01-01
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  • Journal of Colloid and Interface Science
117 Enhancement of the electroluminescence properties of iridium-complexes by decorating the ligand with hole-transporting carbazole dendrons Enhancement of the electroluminescence properties of iridium-complexes by decorating the ligand with hole-transporting carbazole dendrons

Iridium complexes are particularly essential and have been intensively utilized as emissive phosphorescence emitters for efficient phosphorescent electroluminescent (EL) devices. In order to improve the EL performance, a series of new iridium complexes decorated with carbazole dendrons in a non-conjugated fashion using an ether linkage were designed and synthesized. The iridium(III) bis(4-methyl-2-phenylpyridinato-N,C2′)picolinate substituted with a hexyl chain (IrG0), N-hexyl carbazole (IrG1), N-hexyl-N′-9,3′:6′,N′′-tercarbazole (IrG2) and N-hexyl-6′,6′′′-di(carbazol-N-yl)-N′′,3′:N′,3′′:6′′,N′′′:3′′′,N′′′′-quinquecarbazole (IrG3) was designed to afford improved hole-transporting properties without affecting the iridium core's photophysical and electronic properties. The synthesized iridium complexes exhibited intense yellowish-green photoluminescence (PL) emissions at 542–561 nm in the film state. The hole-transporting capability of the complexes was found to be improved when carbazole dendrons were incorporated in the ligand and increased as the generation of the substituent carbazole dendrons increased in the order of IrG0 < IrG1 < IrG2 < IrG3. In particular, the use of IrG3, showing the highest hole mobility, in an organic light-emitting diode (OLED) device resulted in a strong and stable green emission peaking at 532 nm (color coordinates CIE x, y of (0.36, 0.56)) with a brightness of 16 170 cd m−2, the maximum luminous efficiency of 13.59 cd A−1 and a maximum EQE of 4.36%.

สายันต์ แสงสุวรรณ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-01-22
    ชื่อวารสาร
  • New Journal of Chemistry
118 Antimicrobial electrospun nanofiber mats of NaOH-hydrolyzed chitosan (HCS)/PVP/PVA incorporated with in-situ synthesized AgNPs: Fabrication, characterization, and antibacterial activity Antimicrobial electrospun nanofiber mats of NaOH-hydrolyzed chitosan (HCS)/PVP/PVA incorporated with in-situ synthesized AgNPs: Fabrication, characterization, and antibacterial activity

This work aims to improve the electrospinability and antibacterial activity of chitosan (CS) - based nanofibers. Three approaches consisting of reducing molecular weight of CS by NaOH hydrolysis (HCS), blending with two carrying polymers (polyvinylpyrrolidone (PVP) and polyvinyl alcohol (PVA)) and incorporating with in-situ synthesized silver nanoparticles (AgNPs) were integrated simultaneously for the first time to fabricate the HCS-AgNPs/PVP/PVA multicomponent nanofibers. The electrospinning parameters were optimized to obtain the smooth and uniform nanofibers without beads of both HCS/PVP/PVA and HCS-AgNPs/PVP/PVA systems. The presence of in-situ AgNPs in the multicomponent blends gives the better electrospinning performance and the lowest fiber diameter of 139 nm. In addition, the thermal properties, thermal stability and crystallinity index of both nanofibers also increased with increasing HCS or HCS-AgNPs fractions. Finally, the best antibacterial activity of HCS/PVP/PVA and HCS-AgNPs/PVP/PVA nanofibers against E. coli was found to be 74.4% and 99.9%, respectively. The significant enhancement in bactericidal activity of HCS-AgNPs/PVP/PVA nanofibers against E. coli is due to the synergistic properties of HCS/PVP/PVA blends and AgNPs. Both nanofiber mats displayed the excellent structural stability in moisture environment for at least 7 days. Therefore, the HCS-AgNPs/PVP/PVA nanofibers could be a potential material for applying in the medical purpose.

สายันต์ แสงสุวรรณ Q2 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-11-01
    ชื่อวารสาร
  • International Journal of Biological Macromolecules
119 0 0

A new fluorescence probe based on [5]helicene derivative (MT) was designed and synthesized. The chemical structure of the probe was fully characterized by NMR, mass spectrometry and X-ray crystallography. MT which is the combination of thioamide[5]helicene with Schiff base-thiophene moiety, exhibited a high selectivity to detect Hg2+ through irreversible desulfurization reaction with “TurnON” fluorescence response and large Stokes shift of 110 nm in aqueous methanol solution. The detection limit of MT was 1.2 ppb (6.0 × 10−3 µM), which is lower than the limit of Hg2+ level in drinking water, as specified by WHO (6.0 ppb) and U.S. EPA (2.0 ppb). The Hg2+ detection range of the probe was 0.07–1.6 µM with good linearity. Under UV irradiation, MT possessed the capability to detect Hg2+ in diverse context of real samples, including drinking and sea waters, vegetable tissue and brain tumor cell. In addition, MT could be used as a paper test strip for monitoring and screening of Hg2+ contamination in environment.

ศิริพร จึงสุทธิวงษ์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-09-15
    ชื่อวารสาร
  • Journal of Hazardous Materials
120 Enzymatic electrochemical biosensor for glyphosate detection based on acid phosphatase inhibition Enzymatic electrochemical biosensor for glyphosate detection based on acid phosphatase inhibition

A novel enzymatic electrochemical biosensor was fabricated for the indirect detection of glyphosate-based acid phosphatase inhibition. The biosensor was constructed on a screen-printed carbon electrode modified with silver nanoparticles, decorated with electrochemically reduced graphene oxide, and chemically immobilized with acid phosphatase via glutaraldehyde cross-linking. We measured the oxidation current by chronoamperometry. The current arose from the enzymatic reaction of acid phosphatase and the enzyme-substrate disodium phenyl phosphate. The biosensing response is a decrease in signal resulting from inhibition of acid phosphatase in the presence of glyphosate inhibitor. The inhibition of acid phosphatase by glyphosate was investigated as a reversible competitive-type reaction based on the Lineweaver-Burk equation. Computational docking confirmed that glyphosate was the inhibitor bound in the substrate-binding pocket of acid phosphatase and that it was able to inhibit the enzyme efficiently. Additionally, the established method was applied to the selective analysis of glyphosate in actual samples with satisfactory results following a standard method.

อัญชลี สำเภา Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-07-27
    ชื่อวารสาร
  • Analytical and Bioanalytical Chemistry
121 Precisely controlled delivery of plant hormone using poly(vinyl alcohol)/zeolite A hydrofilm composite Precisely controlled delivery of plant hormone using poly(vinyl alcohol)/zeolite A hydrofilm composite

Programmable release of a plant hormone, 1-naphthylacetic acid (NAA), could be achieved by using a novel zeolite–hydrofilm (ZHF) composite. The ZHF was prepared using poly(vinyl alcohol) and glutaraldehyde as a cross-linking agent with the addition of different amounts of zeolite A (0, 1.5, 2.0, 2.5, and 3.0 wt%). This reveals that ZHF was formed as a phase-separated microcomposite with chemical interactions between zeolite A and polymer matrix. We found that the composite film with 2.5 wt% zeolite A had the largest pore size, which exhibited the highest water absorbency and the longest water retention time of over 7 h with high thermal and mechanical stabilities. Release profile displayed rapid desorption of NAA from the film at the initial stage, followed by sustained release thereafter. This behavior was explained by the Korsmeyer–Peppas model with a predominant mechanism of simple Fickian diffusion. Additionally, ZHF with NAA could effectively enhance adventitious root formation of Ocimum basilicum Linn. (sweet basil) cuttings due to accurate releasing NAA and time duration for releasing plant hormone. Finally, the NAA released at the film surface could be in a controlled manner with less negative impact on plant and environment.

มาลี ประจวบสุข Q2 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-07-12
    ชื่อวารสาร
  • Polymer Engineering and Science
122 Cytotoxicity and nitric oxide production inhibitory activities of compounds isolated from the plant pathogenic fungus curvularia sp Cytotoxicity and nitric oxide production inhibitory activities of compounds isolated from the plant pathogenic fungus curvularia sp

Chemical investigation of the mycelia of the pathogenic fungus Curvularia sp. which was isolated from a leaf of Dactyloctenium aegyptium (crowfoot grass), resulted in the isolation of a new compound, curvulariahawadride (5), along with five known compounds (1–4, and 6). Their structures were determined on the basis of spectroscopic data, including 1D and 2D NMR and HRESIMS. The absolute configuration of 5 was established from experimental and calculated electronic circular dichroism (ECD). Compounds 1, 3, and 5 showed nitric oxide (NO) production inhibitory activity with IC50 values of 53.7, 32.8, and 12.8 µM, respectively. Compounds 2 and 4 showed significant cytotoxicity against lung cancer A549, colorectal cancer SW480, and leukemic K562 cells with an IC50 ranging value of 11.73 to 17.59 µM.

ศิริพร จึงสุทธิวงษ์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-05-22
    ชื่อวารสาร
  • Journal of Fungi
123 Enhanced catalytic activity in hydrogen production from hydrolysis of sodium borohydride using starch hydrogel-CoNi bimetallic alloys Enhanced catalytic activity in hydrogen production from hydrolysis of sodium borohydride using starch hydrogel-CoNi bimetallic alloys

In this article, starch hydrogel was successfully prepared using a citric acid cross-linking method and was used as a template to synthesize starch hydrogel-CoNi bimetallic alloys by the in situ reduction in Co2+ Ni2+ ions using NaBH4 as the reducing agent in the presence of the starch hydrogel network. The starch hydrogel-CoNi bimetallic alloys were simply isolated by filtration and also characterized by SEM, TEM, TGA, FTIR and XRD, respectively. The catalytic activity of starch hydrogel-CoNi bimetallic alloys was used as a catalyst in the hydrogen production from the hydrolysis of NaBH4 in the presence of alkaline solution. The variables affecting on the hydrolysis of NaBH4 such as the initial CoNi molar ratio, initial NaOH concentration, catalyst amount, initial NaBH4 concentration and reaction temperature were examined. The activation energy (Ea), the activation enthalpy (∆H#) and the activation entropy (∆S#) were found to be 36.24 kJ mol−1, 37.75 kJ mol−1 and − 125.23 kJ mol−1 K−1, respectively. The catalyst can be used up to 5 times with 100% conversion, and the catalyst was remained 68% activity after storing 15 days. This approach offers a great potential to utilize starch hydrogel acting as a biocompatible material for a large-scale synthesis of bimetallic alloys for various applications in catalysis.

เสนอ ชัยรัมย์ Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-03-01
    ชื่อวารสาร
  • Journal of the Iranian Chemical Society volume
124 Intrinsic property and catalytic performance of single and double metal atoms incorporated g-C3N4 for O2 activation: A DFT insight Intrinsic property and catalytic performance of single and double metal atoms incorporated g-C3N4 for O2 activation: A DFT insight

The intrinsic properties and catalytic performances of single- and double-transition metals on graphitic carbon nitride, TMn@g-C3N4 (n = 1,2), toward the O2 activation were investigated by DFT calculation. The 3d-TM atoms are firmly trapped inside g-C3N4 which prevents the metal clustering and shows high thermodynamic stability. The dimetal-dioxygen adsorption configuration of the O2/TM2@g-C3N4 promotes electron transfer from catalyst to the adsorbed O2, which improves their catalytic performances over the O2/TM@g-C3N4. We observed the two different electron transfer mechanisms for O2 activation on TMn@g-C3N4, in which the double-metal acts as an electron donor while the single-metal acts as the bridge for electron transfer from the substrate to the adsorbed O2. Remarkably, the catalytic performance of the TMn@g-C3N4 for O2 dissociation has a strong correlation with the three factors, (i) the charge gained on adsorbed O2, (ii) the O2 adsorption energy, and (iii) the O-O distance. The Fe2@g-C3N4 as a low-cost and non-precious metal catalyst shows the best catalytic performance with the lowest activation energy barrier of 0.26 eV for O2 activation, and therefore, is predicted as a potential catalyst for O2 consuming reactions. Our finding provides useful information for further design and development of high efficient few-atom catalysts based 2D-carbon materials.

ศิริพร จึงสุทธิวงษ์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-03-01
    ชื่อวารสาร
  • Applied Surface Science
125 Effect of the mode of fixation of the thienyl rings on the electronic properties of electron acceptors based on indacenodithiophene (IDT) Effect of the mode of fixation of the thienyl rings on the electronic properties of electron acceptors based on indacenodithiophene (IDT)

Indacenodithiophene (IDT) is a major building block for the design of advanced functional π-conjugated polymers and nonfullerene electron-acceptor materials for organic photovoltaics. Preliminary results of a synthetic approach aiming at the modulation of the electronic properties of IDT-based acceptors by modification of the mode of linkage of the thiophene rings with the median phenyl ring are presented. The synthesis of three acceptor-donor-acceptor (A-D-A) structures corresponding to the different possible modes of thiophene-phenyl connection (1–3) is described and their electronic properties are discussed on the basis of the results of UV–Vis absorption spectroscopy, cyclic voltammetry and theoretical calculations.

ศิริพร จึงสุทธิวงษ์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-03-01
    ชื่อวารสาร
  • Dyes and Pigments
126 New Pyrrolobenzoxazine Sesquiterpenoid Derivatives from the Fungus Talaromyces trachyspermus New Pyrrolobenzoxazine Sesquiterpenoid Derivatives from the Fungus Talaromyces trachyspermus

Three new pyrrolobenzoxazine sesquiterpenoids, talatrachyoxazines A – C (1 – 3), together with fourteen known compounds (4 – 17), were isolated from the fungus Talaromyces trachyspermus EU23. Their structures were identified by spectroscopic evidence and mass spectrometry. The absolute configurations of 1 – 3 were determined by NOESY data and comparison of their calculated and experimental electronic circular dichroism (ECD) spectra. Compound 1 showed cytotoxic activity against HelaS3, KB, HT-29, MCF-7, and HepG2 cell lines with IC50 values of 7, 11, 10, 12, and 10 µM, respectively. Compounds 1 and 14 showed weak antibacterial activity against the gram-positive bacteria Bacillus cereus and Bacillus subtilis, while 1 – 3 and 14 showed weak antibacterial activity against the gram-negative bacterium Pseudomonas aeruginosa. In addition, compound 1 showed weak antibacterial activity against Escherichia coli.

ศิริพร จึงสุทธิวงษ์ Q3 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-02-06
    ชื่อวารสาร
  • Planta Medica
127 Structure-properties relationships in triarylamine-based push-pull systems-C60 dyads as active material for single-material organic solar cells Structure-properties relationships in triarylamine-based push-pull systems-C60 dyads as active material for single-material organic solar cells

The synthesis of a dyad involving a small arylamine-dicyanovinyl push-pull system as donor block and C60 fullerene as acceptor, connected by a flexible insulating linker formed by esterification of a β-hydroxymethylthiophene spacer is described. Unlike previously reported parent dyads with linkers connected at the 2-position of the thienyl spacer, this mode of connection allows the preservation of a free carbaldehyde group and thus the possibility to modulate the energy levels of the push-pull donor block. The electronic properties of the new dyad are analyzed by UV–Vis absorption spectroscopy, cyclic voltammetry, and theoretical calculations. A preliminary evaluation of this compound as active material for single-material organic solar cells is reported and discussed with reference to the mode of linkage of donor and C60 blocks.

ศิริพร จึงสุทธิวงษ์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-01-01
    ชื่อวารสาร
  • Dyes and Pigments
128 Turn-on fluorescent probe towards glyphosate and Cr3+based on Cd(ii)-metal organic framework with Lewis basic sites Turn-on fluorescent probe towards glyphosate and Cr3+based on Cd(ii)-metal organic framework with Lewis basic sites

A microcrystalline Cd(II)-MOF, [Cd(NH2-bdc)(azp)]·DMF (NH2-H2bdc = 2-amino-1,4-benzenedicarboxylic acid and azp = 4,4′-azopyridine), namely 1-NH2 was rationally designed and synthesized as a fluorescent sensor in the off state utilizing the photo-induced electron transfer (PET) process. The crystal structure of 1-NH2 features a porous 2-fold interpenetrated 3D framework with 1D channels decorated with open Lewis basic amino and azo groups for recognizing the target species. Time-dependent density functional theory (TD-DFT) calculations were performed to gain insight into the PET process that induces the fluorescent quenching of 1-NH2. The proposed 1-NH2 is the first MOF that presents highly selective and sensitive visual turn-on fluorescence detection of glyphosate and Cr3+ with very low detection limits of 25 nM and 0.6 μM, respectively. The amino moiety in 1-NH2 plays a key role for the selective binding of Cr3+ to facilitate the sensitivity and selectivity of the detection. The fluorescent enhancement mechanism is associated with the inhibition of the PET process stimulated by the dissociation of the framework of 1-NH2 in the presence of glyphosate and Cr3+.

ศิริพร จึงสุทธิวงษ์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-01-01
    ชื่อวารสาร
  • Inorganic Chemistry Frontiers
129 Co-embedded sulfur vacant MoS2 monolayer as a promising catalyst for formaldehyde oxidation: a theoretical evaluation† Co-embedded sulfur vacant MoS2 monolayer as a promising catalyst for formaldehyde oxidation: a theoretical evaluation†

In this work, we theoretically evaluated the complete catalytic oxidation of formaldehyde (HCHO) catalyzed by a cobalt embedded sulfur vacant MoS2 (COSv–MoS2) monolayer. The density functional theory calculations demonstrate that the Co atom is strongly anchored at the S vacancy site of the MoS2 monolayer forming a single-atom catalyst without metal clustering. From the study of all possible elementary steps, we propose two possible catalytic pathways for HCHO oxidation; (1) consecutive path: HCHO dehydrogenation followed by CO oxidation with O2, and (2) co-adsorption path: HCHO oxidation by O2 through the Langmuir–Hinshelwood mechanism. Compared to the catalysts reported in the literature, this catalyst presents lower activation energy barriers for C–H bond cleavage. At room temperature, the consecutive path is found to be dominant, and the calculated activation free energy barrier is only 0.46 eV (44.38 kJ mol−1). Our kinetic analyses show that HCHO oxidation can easily occur at room temperature with a rate of 1.12 × 105 s−1. Therefore, this non-noble metal single atom COSv–MoS2 catalyst demonstrates excellent activity for HCHO catalytic oxidation at low temperatures.

ศิริพร จึงสุทธิวงษ์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-10-07
    ชื่อวารสาร
  • New Journal of Chemistry
130 Antitubercular and antibacterial activities of isoxazolines derived from natural products: Isoxazolines as inhibitors of Mycobacterium tuberculosis InhA Antitubercular and antibacterial activities of isoxazolines derived from natural products: Isoxazolines as inhibitors of Mycobacterium tuberculosis InhA

Isoxazoline derivatives of the natural products eugenol, 1’-S-acetoxychavicol acetate and sclareol are prepared through 1,3-dipolar cycloaddition reactions in an aqueous buffered system. The compounds are evaluated for their antitubercular and antibacterial activities. Compounds 2, 2a and 3f display strong antitubercular activity with minimum inhibitory concentration values of 26.68, 17.89 and 14.58µM, respectively. Furthermore, derivative 3f exhibits antibacterial activity against Bacillus cereus (minimum inhibitory concentration value of 29.16µM). Isoxazoline derivatives of 1’-Sacetoxychavicol acetate demonstrate improvements in cytotoxicity, and derivative 3f of sclareol demonstrates improved antitubercular and antibacterial activities. Isoxazolines derived from natural products exhibit Mycobacterium tuberculosis enoyl-acyl carrier protein reductase (InhA) inhibitory activity, and molecular modelling predicts that they form hydrogen bonding and hydrophobic interactions with NADH and with the key residues of the InhA binding site.

พรพรรณ พึ่งโพธิ์ Q4 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-11-01
    ชื่อวารสาร
  • Journal of Chemical Research
131 Ready-to-use paraquat sensor using a graphene-screen printed electrode modified with a molecularly imprinted polymer coating on a platinum core Ready-to-use paraquat sensor using a graphene-screen printed electrode modified with a molecularly imprinted polymer coating on a platinum core

We propose the fabrication of a novel ready-to-use electrochemical sensor based on a screen-printed graphene paste electrode (SPGrE) modified with platinum nanoparticles and coated with a molecularly imprinted polymer (PtNPs@MIP) for sensitive and cost-effective detection of paraquat (PQ) herbicide. Successive coating of the PtNPs surface with SiO2 and vinyl end-groups formed the PtNPs@MIP. Next, we terminated the vinyl groups with a molecularly imprinted polymer (MIP) shell. MIP was attached to the PtNPs cores using PQ as the template, methacrylic acid (MAA) as the monomer, ethylene glycol dimethacrylate (EGDMA) as the cross-linker, and 2,2′-azobisisobutyronitrile (AIBN) as the initiator. Coating the SPGrE surface with PtNPs@MIP furnished the PQ sensor. We studied the electrochemical mechanism of PQ on the MIP sensor using cyclic voltammetry (CV) experiments. The PQ oxidation current signal appears at -1.08 V and -0.71 V vs. Ag/AgCl using 0.1 M potassium sulfate solution. Quantitative analysis was performed by anodic stripping voltammetry (ASV) using a deposition potential of -1.4 V for 60 s and linear sweep voltammetric stripping. The MIP sensor provides linearity from 0.05 to 1000 μM (r2 = 0.999), with a lower detection limit of 0.02 μM (at -0.71 V). The compact imprinted sensor gave a highly sensitive and selective signal toward PQ. The ready-to-use MIP sensor can provide an alternative approach to the determination of paraquat residue on vegetables and fruits for food safety applications.

มะลิวรรณ อมตธงไชย Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2021-10-21
    ชื่อวารสาร
  • The Analyst
132 0 0

A novel fluorometric assay for selective and sensitive determination of formalin (FA) was developed based on nitrogen-doped carbon dots (N-CDs) coupled with silver mirror reaction. N-CDs was synthesized using the hydrothermal method with the ethylene glycol and ammonia solution as carbon and nitrogen precursors, respectively. The detection principle was based on “off-on” fluorescence switching. Specifically, the fluorescence signal of N-CDs was first turned off after incorporating the Ag+ and Tollens’ reagents. Then, in the presence of FA, the Ag+ species on the N-CDs surface were reduced to Ag0 species and the fluorescence signal of N-CDs was switched back on. The fluorescence intensity due to the N-CDs signal linearly increased with the increasing FA concentrations in the range of 5–100 mg L−1, with the detection limit of 1.5 mg L−1. The proposed approach provides rapid, simple, sensitive, and selective detection of FA in various food samples.

ปุริม จารุจำรัส Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2022-01-01
    ชื่อวารสาร
  • Talanta
133 Combined in situ XAS and DFT studies on the role of Pt in zeolite-supported metal catalysts for selective n-hexane isomerization Combined in situ XAS and DFT studies on the role of Pt in zeolite-supported metal catalysts for selective n-hexane isomerization

In this study, we used several in situ, and spectroscopy analyses to investigate the roles of platinum (Pt) in zeolite-supported Pt catalysts for selective n-alkane isomerization. HY zeolites were synthesized using the rice husk silica and impregnated with Pt precursor by incipient wetness impregnation. Typically, HY zeolites have proved to be active hydrocarbon cracking catalysts. The particular challenge is to find an effective catalyst, which favors the isomerization of n-alkanes without too much cracking. In this work, adding Pt atoms to HY zeolite provides an enhanced multifunctional catalyst for converting n-alkanes to branched hydrocarbons. To understand the effect of Pt, we further investigated the reaction mechanism of n-hexane isomerization to 2–methylpentane (2MP) and 3-methylpentane (3MP) by DFT simulations, using a cluster of 30T HY zeolite modeled through B3LYP + 3D calculations. We found that, at 450 °C, the isomerization on Pt-HY gives higher cracking products. Decreasing temperature to 300 °C yielded greater selectivity of branched hydrocarbons. In addition, DFT calculations demonstrate that the 2MP production via route A1 (C3-C4 bond activation) and a rate-determining step of 0.97 eV proved more thermodynamically and kinetically favorable than the 3MP product. This agrees well with our experimental observations. Consequently, the presence of Pt on the HY zeolite plays an essential role in both C–C forming and breaking. Finally, the Pt–HY zeolite is an efficient catalyst for petroleum production, improving the octane number for catalytic performance and product selectivity by isomerizing straight-chain alkanes to their branched chain isomers.

ศิริพร จึงสุทธิวงษ์ Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2022-04-15
    ชื่อวารสาร
  • Fuel
    DOI
134 Ag3PO4/Ag nanocomposite for selective and sensitive cyanide determination in food samples through catalytical colorimetry using a paper-based test kit Ag3PO4/Ag nanocomposite for selective and sensitive cyanide determination in food samples through catalytical colorimetry using a paper-based test kit

A paper-based test kit for selective and sensitive determination of cyanide was successfully developed using a Ag3PO4/Ag nanocomposite for catalytic colorimetry. The Ag3PO4/Ag nanocomposite synthesized via a one-step chemical bath method could instantly oxidize the chromogenic substrate ABTS for the color development under acidic conditions without the requirement of H2O2. During the detection step, cyanide in the sample was converted into gaseous hydrogen cyanide (HCN) using sulfuric acid. The HCN species then reacted with the generated Ag+ species via coordinate covalent bonding to form silver cyanide complex ions [Ag (CN2)]-. The amount of Ag+ species used for oxidizing ABTS subsequently decreased and so did the color intensity on the paper-based test kit. Specifically, the color intensity decreased with increasing cyanide concentrations in the range of 2.50–20.0 mg L−1. The limit of detection (LOD) and limit of quantification (LOQ) were 0.48 mg L−1 and 1.59 mg L−1, respectively. The developed test kit showed relatively high selectivity towards cyanide and high tolerance towards other cations and anions present in real samples. When applied to real samples including fruit juices and food products, the performance of the rapid and low-cost test kit was well validated by a conventional precipitation titration method. © 2022 Elsevier B.V.

ปุริม จารุจำรัส Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2022-04-01
    ชื่อวารสาร
  • Sensors and Actuators B: Chemical
135 Smart sensor for assessment of oxidative/nitrative stress biomarkers using a dual-imprinted electrochemical paper-based analytical device Smart sensor for assessment of oxidative/nitrative stress biomarkers using a dual-imprinted electrochemical paper-based analytical device

We present a novel dual-imprinted electrochemical paper-based analytical device (Di-ePAD) to simultaneously determine 8-hydroxy-2′-deoxyguanosine (8-OHdG) and 3-nitrotyrosine (3-NT) and assess oxidative and nitrative biomarkers in urine and plasma samples. The Di-ePAD was designed with hydrophobic barrier layers formed on filter paper to provide three-dimensional circular reservoirs and assembled electrodes. The molecularly imprinted polymer (MIP) was synthesized using a silica nanosphere decorated with silver nanoparticles (SiO2@AgNPs) as a core covered with dual-analyte imprinted sites on the polymer to recognize selectively and bind the target biomarkers. This strategy drives monodispersity and enhances the conductivity of the resulting MIP core-shell products. 3-NT-MIP and 8-OHdG-MIP were synthesized by successively coating the surface of SiO2@AgNPs with L-Cysteine via the thiol group, then terminating with MIP shells. The dual imprinted core-shell composites possess attractive properties for the target biomarkers' sensing, including catalytic activity, selectivity, and good conductivity. The Di-ePAD revealed excellent linear dynamic ranges of 0.01–500 μM for 3-NT and 0.05–500 μM for 8-OHdG, with detection limits of 0.0027 μM for 3-NT and 0.0138 μM for 8-OHdG. This newly developed method based on the synergistic effects of SiO2@AgNPs combined with promising properties of MIP offers outstanding selectivity, sensitivity, reproducibility, simplicity, and low cost for quantitative analysis of 3-NT and 8-OHdG. The proposed Di-ePAD showed good accuracy and precision when applied to actual samples, including urine and serum samples validated by a conventional HPLC method. 

มะลิวรรณ อมตธงไชย Q1 นานาชาติ
    วันที่ตีพิมพ์
  • 2022-01-25
    ชื่อวารสาร
  • Analytica Chimica Acta