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 Pt4 (-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 |
ชื่อวารสาร
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Applied Surface Science
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2 |
Preparation and characterization of modified telechelic natural rubber-based pressure-sensitive adhesive |
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ศิริวัฒน์ ระดาบุตร |
Q3 |
นานาชาติ |
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3 |
Photoresponsive Nano-Coumarin with Indole Auxin Hormone |
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รักเกียรติ จิตคติ |
Q3 |
นานาชาติ |
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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 |
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มะลิวรรณ อมตธงไชย |
Q3 |
นานาชาติ |
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5 |
Synthesis and properties biodegradable hydrogels based on cross-linked natural rubber and cassava starch |
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ชัยวุฒิ วัดจัง |
Q3 |
นานาชาติ |
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6 |
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 |
ชื่อวารสาร
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CHEMISTRYSELECT
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7 |
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 |
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8 |
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 |
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9 |
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 |
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10 |
Significant enhancement in the performance of porphyrin for dye-sensitized solar cells: aggregation control using chenodeoxycholic acid |
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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 |
ชื่อวารสาร
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NEW JOURNAL OF CHEMISTRY
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11 |
A spectroscopic study of indigo dye in aqueous solution: A combined experimental and TD-DFT study |
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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 |
ชื่อวารสาร
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JOURNAL OF LUMINESCENCE
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12 |
Development of interactive particulate-level visualization in chemistry by using augmented reality technology: Collision theory and chemical reaction rate |
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ศักดิ์ศรี สุภาษร |
Q2 |
นานาชาติ |
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13 |
Multi step energy transfer between three Si_LTL and SiGe_LTL zeoliteloaded dyes |
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ศิริพร จึงสุทธิวงษ์ |
Q2 |
นานาชาติ |
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14 |
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 |
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15 |
การพัฒนาความเข้าใจมโนมติของนักเรียนระดับมัธยมศึกษาปีที่ 5 เรื่อง อัตราการเกิดปฏิกิริยาเคมี ด้วยการทดลองแบบสืบเสาะ |
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สุภาพ ตาเมือง |
Q3 |
นานาชาติ |
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16 |
Carbon-doped boron nitride nanosheet as a promising metal-free catalyst for NO reduction: DFT mechanistic study |
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ศิริพร จึงสุทธิวงษ์ |
Q3 |
นานาชาติ |
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17 |
Monitoring of glucose and ethanol during winefermentation by bienzymatic biosensor |
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อัญชลี สำเภา |
Q3 |
นานาชาติ |
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18 |
Selective amperometric flow-injection analysis of carbonfuran using a molecularly-imprinted polymer and gold coated magnetite modified carbon nanotube-paste electrode |
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มะลิวรรณ อมตธงไชย |
Q3 |
นานาชาติ |
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19 |
Complexometric and argentometric titrations using thread-based analytical devices |
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ปุริม จารุจำรัส |
Q3 |
นานาชาติ |
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20 |
Molecular docking study of pyrrolyl benzohydrazide derivatives to explore the structure requirements of InhA inhibitors |
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พรพรรณ พึ่งโพธิ์ |
Q3 |
นานาชาติ |
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21 |
Rational design of PknB inhibitors in class of 4-oxo-crotonic acid derivatives as highly potent anti-tuberculosis agents |
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พรพรรณ พึ่งโพธิ์ |
Q3 |
นานาชาติ |
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22 |
Computer aided molecular design of ATPase inhibitors in a series of 7-chloro-4-piperazinoquinoline derivatives: Molecular docking and 3D-QSAR study |
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พรพรรณ พึ่งโพธิ์ |
Q3 |
นานาชาติ |
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23 |
Elucidating structural basis of 4-aminoquinoline derivatives as novel M. tuberculosis DNA GyrB inhibiters: molecular docking study |
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พรพรรณ พึ่งโพธิ์ |
Q3 |
นานาชาติ |
|
24 |
Structure based drug design of 2-(1H-benzo[d]imidazol-2-yl)-2-cyanovinyl as DNA gyrase subunit B inhibitors for anti-tuberculosis agent |
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พรพรรณ พึ่งโพธิ์ |
Q3 |
นานาชาติ |
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25 |
carboxamide analogues as DNA gyrase subunit B inhibitors for anti-tuberculosis agents: 3D-QSAR Molecular docking calculations |
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พรพรรณ พึ่งโพธิ์ |
Q3 |
นานาชาติ |
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26 |
Molecular modeling of InhA inhibitors in the class of Benzimidazole derivatives as a novel Anti-tuberculosis agents |
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พรพรรณ พึ่งโพธิ์ |
Q3 |
นานาชาติ |
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27 |
The equilibrium study of methylene blue from aqueous solution using zeolite synthesized as highly potential adsorbent from water sludge |
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พรพรรณ พึ่งโพธิ์ |
Q3 |
นานาชาติ |
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28 |
Utilization of zeolites synthesized from water sludge for heavy metal treatment in wastewater |
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พรพรรณ พึ่งโพธิ์ |
Q3 |
นานาชาติ |
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29 |
A Novel Benzo[d,e]Chromene for Organic Light Emitting Diodes (OLEDs) |
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รักเกียรติ จิตคติ |
Q3 |
นานาชาติ |
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30 |
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 |
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เสนอ ชัยรัมย์ |
Q3 |
นานาชาติ |
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31 |
Fabricating Simple Wax Screen-Printing Paper-Based Analytical Devices To Demonstrate the Concept of Limiting Reagent in Acid−Base Reactions |
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เสนอ ชัยรัมย์ |
Q3 |
นานาชาติ |
|
32 |
Atomic force microscopy investigation of phase morphology correlated with adhesive properties for modified telechelic natural rubber based-pressure sensitive adhesive |
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ศิริวัฒน์ ระดาบุตร |
Q3 |
นานาชาติ |
|
33 |
Use of a smartphone as a Colorimetric Analyzer in Paper-based Devices for Sensitive and Selective determination of Mercury in Water Samples |
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ปุริม จารุจำรัส |
Q3 |
นานาชาติ |
ชื่อวารสาร
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Analytical Sciences
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34 |
Comparison of reinforcing efficiency between calcium carbonate/carbon black and calcium carbonate/silica hybrid filled natural rubber composites |
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สราวุธ ประเสริฐศรี |
Q3 |
นานาชาติ |
|
35 |
Thiocyanate Free Ruthenium(II) Complexes for Dye Sensitized Solar Cells (DSSCs) |
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รักเกียรติ จิตคติ |
Q3 |
นานาชาติ |
ชื่อวารสาร
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Defect & Diffusion Forum
|
36 |
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 |
|
37 |
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 |
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38 |
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 |
ชื่อวารสาร
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Analytica Chimica Acta
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39 |
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 |
|
40 |
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 |
ชื่อวารสาร
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Analytica Chimica Acta
|
41 |
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 |
ชื่อวารสาร
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Analytica Chimica Acta
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42 |
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 |
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43 |
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 |
ชื่อวารสาร
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Analytical Methods
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44 |
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 |
ชื่อวารสาร
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Macromolecules
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45 |
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 |
|
46 |
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 |
|
47 |
การศึกษาฤทธิ์ในการต้านอนุมูลอิสระและปริมาณฟีนอลิกรวมของสารสกัดข้าวกล้องงอก |
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สมจินตนา ทวีพานิชย์ |
Q1 |
นานาชาติ |
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48 |
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 |
|
49 |
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 |
|
50 |
Bioactive oxaphenalenone dimers from the fungus Talaromyces macrosporus KKU-1NK8 |
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ศิริพร จึงสุทธิวงษ์ |
Q2 |
นานาชาติ |
|
51 |
Novel biodegradable hydrogel based on natural polymers: synthesis, characterization, swelling/reswelling and biodegradability |
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สายันต์ แสงสุวรรณ |
Q1 |
นานาชาติ |
ชื่อวารสาร
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European Polymer Journal
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52 |
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.
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ปุริม จารุจำรัส |
Q4 |
นานาชาติ |
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53 |
Interaction and structural requirement of 4-thiazolidinone (rhodanine) inhibitors as potential anti-tuberculosis agents: MD simulations |
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พรพรรณ พึ่งโพธิ์ |
ยังไม่มีระดับ Quartile Scor |
นานาชาติ |
|
54 |
Molecular docking calculations of novel pyrrolyl benzohydrazide and pyrrolyl benzamide derivatives InhA inhibitors as anti-tuberculosis agents |
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พรพรรณ พึ่งโพธิ์ |
ยังไม่มีระดับ Quartile Scor |
นานาชาติ |
|
55 |
Utilization of zeolites synthesized from water sludge for study of manganese treatment in wastewater |
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มาลี ประจวบสุข |
ยังไม่มีระดับ Quartile Scor |
นานาชาติ |
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56 |
Removal of Anionic Dyes from Aqueous Solution using Surfactant Modification of Ranong White Clay as Highly Potential Adsorbent |
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พรพรรณ พึ่งโพธิ์ |
ยังไม่มีระดับ Quartile Scor |
นานาชาติ |
|
57 |
Removal of industrial dyes from aqueous solution using geopolymer from metakaolin as a highly potential adsorbent |
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สายสมร ลำลอง |
ยังไม่มีระดับ Quartile Scor |
นานาชาติ |
|
58 |
Development of Agricultural Waste for Reuse Catalyst |
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สายสมร ลำลอง |
ยังไม่มีระดับ Quartile Scor |
นานาชาติ |
|
59 |
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 |
|
60 |
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 |
|
61 |
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 |
ชื่อวารสาร
-
Microchemical Journal
|
62 |
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 |
|
63 |
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 |
|
64 |
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 |
|
65 |
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 |
ชื่อวารสาร
-
Polymer Bulletin
|
66 |
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 |
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67 |
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 |
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อัญชลี สำเภา |
Q1 |
นานาชาติ |
ชื่อวารสาร
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Bioelectrochemistry
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68 |
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 |
ชื่อวารสาร
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Applied Surface Science
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69 |
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 |
ชื่อวารสาร
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Journal of Food Science
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70 |
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 |
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71 |
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 |
ชื่อวารสาร
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Microchemical Journal
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72 |
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 |
ชื่อวารสาร
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TETRAHEDRON LETTERS
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73 |
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 |
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74 |
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 |
ชื่อวารสาร
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European Polymer Journal
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75 |
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 |
|
76 |
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 |
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77 |
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 |
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78 |
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 |