Phromyothin, Darinee

Preferred name

Alternative Name

Phromyothin, D.

Phromyothin, Darinee Sae Tang

Main Affiliation

Integrated Innovative Technology

darinee.ph@kmitl.ac.th

Now showing 1 - 7 of 7

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Selective electrochemical determination based on magnetic molecularly imprinted polymers for albumin detection
(2022-06-01)
Leepheng, Piyawan
;
Limthin, Dalawan
;
Onlaor, Korakot
;
Tunhoo, Benchapol
;
Thiwawong, Thutiyaporn
Egg allergy is one of the most common allergies in humans. Allergenic egg protein as ovalbumin is the most abundant protein found in egg white. A selective electrode in electrochemical analysis for albumin from egg white was developed based on magnetic molecularly imprinted polymers (albumin-MMIPs) modified on a screen-printed electrode. Surface modification was applied using methyl methacrylate polymer to create surface specificity for albumin protein. The modified surface was characterized by a field-emission scanning electron microscope (FE-SEM). The average pore size was obtained by Brunauer-Emmett-Teller (BET) analysis, and the potentiostat obtained all electrochemical analysis. The albumin-MMIP electrode was selectivity with albumin, comparison with gluten, glycine, casein, and glucose. The modified electrodes present selectivity of 1.13 × 104 μAg-1ml and a limit of detection of 0.18 mg ml-1. The electrode can be applied to albumin protein detection in solution form in food industries.
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Schiff Base modified on CPE electrode and PCB gold electrode for selective determination of silver ion
(2017-10-20)
Leepheng, Piyawan
;
Suramitr, Songwut
;
Phromyothin, Darinee
The schiff base was synthesized by 2,5-thiophenedicarboxaldehyde and 1,2,4-thiadiazole-3,5-diamine with condensation method. There was modified on carbon paste electrode (CPE) and Printed circuit board (PCB) gold electrode for determination silver ion. The schiff base modified electrodes was characterized by atomic force microscopy (AFM) and scanning electron microscopy (SEM), respectively. The electrochemical study was reported by cyclic voltammetry method and impedance spectroscopy using modified electrode as working electrode, platinum wire and Ag/AgCl as counter electrode and reference electrode, respectively. The modified electrodes have suitable detection for Ag+. The determination of silver ions using the modified electrodes depended linearly on Ag+ concentration in the range 1×10-10 M to 1×10-7 M, with cyclic voltammetry sensitivity were 2.51×108 μAM-1 and 1.88×108 μAM-1 for PCB gold electrode and CPE electrode, respectively, limits of detection were 5.33×10-9 M and 1.99×10-8 M for PCB gold electrode and CPE electrode, respectively. The modified electrodes have high accuracy, inexpensive and can applied to detection Ag+ in real samples.
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An experimental and theoretical study of molecularly imprinted electrode based on methyl methacrylate polymer for pesticide detection
(2020-06-01)
Leepheng, Piyawan
;
Limthin, Dalawan
;
Homchan, Wisa
;
Suramitr, Songwut
;
Phromyothin, Darinee
A selective electrode based on molecularly imprinted polymer (MIP) was developed by the polymerization of methyl methacrylate polymer on a screen-printed electrode for pesticide detection. Cypermethrin is one of the pesticides in the pyrethroid group, which has high toxicity in an organism and humans and causes environmental pollution. Cypermethrin-MIP and non-imprinted polymer films on electrodes were characterized for their surface morphology. The electrochemical analysis of cypermethrin pesticide was measured by amperometry under the potential of -0.23 V versus Ag/AgCl. Decreasing the current was directly proportional to the concentration of cypermethrin in the range of 15.50 ppb-10.00 ppm, and the limit of detection value was calculated to be 15.00 ppb. The proposed modified electrode has high sensitivity of 0.094 μA ppm-1 and effective selective detection of cypermethrin in samples of real vegetable juice. The computational analyses were performed with the density functional theory at M06-2x/6-31 g(d,p), which predicted interaction and study mechanism between the MIP matrix with target pesticides.
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The study of metal binding properties and electronic transitions of dithienopyrole derivatives
(2017-01-01)
Thanakit, Prawonwan
;
Suramitr, Songwut
;
Phromyothin, Darinee
Fluorescence chromophore (L) based on dithienopyrole derivatives (DPT) have been compared the binding site for detecting metal ions. There are consisting of methacryloyl amine (L1) and cyanoacrylic acid (L2) acceptor, respectively. Corresponding molecular geometries, orbital energies, electron contributions and absorption properties of the fluorescence sensor were investigated by using density functional theory (DFT) with B3LYP method of calculation. The DFT based studies with various solvation and absorption spectra were performed using time-dependent density functional theory (TD-DFT) with the polarized continuum model. Comparing with L2, the experimental L1 shows a red shift both absorption and emission spectra at 350 and 485 nm, respectively. The solvent environment exhibited slight shift in experimental and calculated absorption. An effect of various metal ions on absorption behavior was studied. Results indicate that the L1 and L2 exhibit excellent sensitivity for Pb2+ ion. The binding complex M-L1 and M-L2 (M: Cd, Cu, Hg, Pb, Zn) exhibited Pb<Cu<Zn<Mn<Cd<Hg.
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Selective electrochemical determination of casein based on magnetic molecularly imprinted nanoparticles
(2019-11-18)
Leepheng, Piyawan
;
Suramitr, Songwut
;
Phromyothin, Darinee
The selective electrochemical determination of casein from bovine milk (consisting of α-s1 Casein, α-s2 Casein, β-Casein, and κ-Casein) was developed based on magnetic molecularly imprinted nanoparticles (MMIPs) modified on the carbon paste electrode. Superparamagnetic iron oxide nanoparticles especially magnetite (Fe<inf>3</inf>O<inf>4</inf>) have been great potential in environment and biomedical applications. In addition, it holds attractive properties for electrochemical because it facilitates the creation of complex structures for electrode modification. The magnetite resulted from the solvothermal method of Fe(II) and Fe(III) was modified and observed the particle size about 6–10 nm, which confirmed by TEM image and XRD spectrum. Synthesized magnetite has high values of saturation magnetization as 57.766 emu/g and negligible values of remanence and coercivity. The surface modification of magnetite was applied using methyl methacrylate to create surface specificity or molecular imprinting to casein template. The template-shaped cavities coated on magnetic nanoparticles were obtained when the template was removed by porogenic solvent and characterized by FTIR and SEM. Cyclic voltammetry method was examined the casein specific MMIPs electrode. The casein detection was presented high selectivity for casein in cow’s milk. The fabricated electrode has high sensitivity and low limit of detection as 1.058 × 102 µAg−1 mL and 0.048% w/v, respectively. That can be applied to portable device for milk allergen contamination.
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Enhancement in Sensitivity and Selectivity of Electrochemical Technique with CuO/g-C3N4 Nanocomposite Combined with Molecularly Imprinted Polymer for Melamine Detection
(2024-07-01)
Limthin, Dalawan
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Leepheng, Piyawan
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Tunhoo, Benchapol
;
Klamchuen, Annop
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Suramitr, Songwut
This study focused on enhancing the sensitivity and selectivity to detect melamine by utilizing a photoelectrochemical method. This was achieved by combining a melamine-imprinted polymer with a CuO/g-C<inf>3</inf>N<inf>4</inf> nanocomposite, which was synthesized through chemical precipitation and calcination. The resulting nanocomposite exhibits improved carrier mobility and photoelectrochemical properties. A molecularly imprinted receptor for selective detection was created through bulk polymerization with methacrylic acid and a melamine template. The characterization of the nanocomposite was performed using X-ray photoelectron spectroscopy for the chemical oxidation state, X-ray diffraction patterns for the crystalline structure, and ultraviolet/visible/near-infrared spectroscopy for optical properties. The CuO/g-C<inf>3</inf>N<inf>4</inf> nanocomposite exhibits photoactivity under visible light. The modified electrode, incorporating the CuO/g-C<inf>3</inf>N<inf>4</inf> nanocomposite and melamine-imprinted polymer, demonstrates a linear detection range of 2.5 to 50 nM, a sensitivity of 4.172 nA/nM for melamine, and a low detection limit of 0.42 nM. It shows good reproducibility and high selectivity to melamine, proving effective against interferences and real samples, showcasing the benefits of the molecularly imprinted polymer.
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Detection of Zinc Ions Using a Fluorescent Compound Derived from a Cyanoacrylic Acid-based Chemosensor
(2025-01-01)
Thanakit, Prawonwan
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Puengvigrai, Supakorn
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Khummung, Teeranuch
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Suramitr, Songwut
;
Trachu, Koson
This study was initially conducted through the synthesis and characterization of a cyanoacrylic acid based on thiophene-phenylethyl-cyanoacrylic acid (TPC). The receptor cyanoacrylic acid derivative revealed an “off-on” mode with high selectivity and sensitivity to Zn2+ ions, whereas the selectivity of the optical sensor for Zn2+ ions was the consequence of chelation-enhanced fluorescence. The possible interference of other metal ions in solution was examined in the presence of different types of metal ion, whereby the results showed high selectivity and sensitivity with a low detection limit of 7.78 × 10-8 M. Furthermore, the geometry of the TPC molecular structure and electronic properties were examined using density functional theory and time-dependent density functional theory. A comparison between calculation and experimental data yielded results indicating that the compound has potential applications in chemosensors.

Phromyothin, Darinee

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