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 - 10 of 12

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Electrochemical analysis of cypermethrin using a gold printed circuit board electrode modified with poly(methyl methacrylate)
(2019-01-01)
Leepheng, Piyawan
;
Phromyothin, Darinee
A gold printed circuit board (PCB) electrode modified with poly(methyl methacrylate) (PMMA) was studied for cypermethrin pesticide detection. The morphology surface of the fabricated electrode was characterized by atomic force microscopy. The electrochemical study was characterized by cyclic voltammetry and impedance spectroscopy using a fabricated electrode as a working electrode, platinum sheet as a counter electrode and silver/silver chloride as a reference electrode. The fabricated electrode has suitable detection for cypermethrin with good selectivity, high sensitivity at 0.279 μA ppm-1, low limit of detection at 0.34 ppm, high accuracy, is inexpensive and can be applied to the portable electrochemical sensor device for detection of cypermethrin in real samples.
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Surface modification: PEG / Dextran encapsulation of SPIONs
(2017-01-01)
Pansailom, Nichakorn
;
Rattanamai, Songsak
;
Leepheng, Piyawan
;
Rattanawarinchai, Prapakorn
;
Chattrairat, Kunanon
In this work, we present an encapsulation of superparamagnetic iron oxide nanoparticles (SPIONs) by dextran40 and polyethylene glycol. The SPIONs were used due to their responsibility to the external magnetic field that recovered easily. Considering the biocompatibility, the SPIONs were encapsulated by dextran40 and polyethylene glycol MW 400 with the suitable combination ratio. The efficiency of encapsulation was evaluated and confirmed using FTIR, and TGA, respectively. The further propose of SPIONs coated with dextran40 and PEG400 can be applied in medical therapy and drug delivery.
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Enhancement of Electrochemical Detection of Gluten with Surface Modification Based on Molecularly Imprinted Polymers Combined with Superparamagnetic Iron Oxide Nanoparticles
(2022-01-01)
Limthin, Dalawan
;
Leepheng, Piyawan
;
Klamchuen, Annop
;
Phromyothin, Darinee
Novel molecularly imprinted polymers (MIPs) represent a selectively recognized technique for electrochemical detection design. This rapid and simple method prepared via chemical synthesis consists of a monomer crosslinked with an initiator, whereas low sensitivity remains a drawback. Nanomaterials can improve charge transfer for MIP surface modification in order to overcome this problem. SPIONs have semiconductor and superparamagnetic properties that can enhance carrier mobility, causing high sensitivity of electrochemical detection. In this work, surface modification was achieved with a combination of MIP and SPIONs for gluten detection. The SPIONs were synthesized via the chemical co-precipitation method and mixed with MIPs by polymerizing gluten and methyl methacrylate (MMA), presented as a template and a monomer. Magnetic MIP (MMIP) was modified on a carbon-plate electrode. The morphology of modified electrode surfaces was determined by scanning electron microscopy–energy-dispersive X-ray spectrometry. The performance of the MMIP electrode was confirmed by cyclic voltammetry, amperometry, and electrochemical impedance spectroscopy. The MMIP electrode for gluten detection shows a dynamic linear range of 5–50 ppm, with a correlation coefficient of 0.994 and a low detection limit of 1.50 ppm, which is less than the U.S. Food and Drug Administration requirements (20 ppm); moreover, it exhibits excellent selectivity, sensitivity, stability, and reproducibility.
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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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Enhancing the sensitivity and selectivity of salbutamol detection using reduced graphene oxide combined with molecularly imprinted polymers (RGO/MIP)
(2022-06-01)
Limthin, Dalawan
;
Leepheng, Piyawan
;
Onlaor, Korakot
;
Tunhoo, Benchapol
;
Klamchuen, Annop
In this study, to enhance the selectivity and sensitivity of salbutamol detection performed by a carbon plate electrode, the electrode was modified using a novel molecularly imprinted polymer (MIP) combined with reduced graphene oxide (RGO). The RGO/MIP combination was prepared by the polymerization of methacrylic acid as a monomer using salbutamol as a template. The surface morphologies of the modified electrodes were studied using field-emission scanning electron microscopy (FE-SEM), and their performance was tested by an electrochemical technique that investigated both the cyclic voltammetry (CV) and amperometry (AMP) modes. The performance of the modified RGO/MIP electrode was compared with that of an MIP electrode, in which the RGO/MIP electrode was demonstrated to have 4.16 nA/ppm of sensitivity, more than the 0.91 nA/ppm of the MIP electrode. The limit of detection (LOD) of the RGO/MIP electrode, which was 0.83 ppm, was lower than that of the MIP electrode. Moreover, the RGO/MIP electrode’s dynamic range extended from 1 to 1000 ppm, and it exhibited consistency, repeatability, a fast response, and high selectivity for salbutamol detection.
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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
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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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Preparation of surface-modified electrode of copper(ii) oxide mixed with the molecularly imprinted polymer for enhancement of melamine detection with photoelectrochemical technique
(2023-05-15)
Limthin, Dalawan
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Leepheng, Piyawan
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Tunhoo, Benchapol
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Onlaor, Korakot
;
Klamchuen, Annop
Melamine contamination in food and beverages affects short- and long-term health. In this work, enhanced sensitivity and selectivity in photoelectrochemical determination for melamine detection was achieved using copper(ii) oxide (CuO) combined with a molecularly imprinted polymer (MIP). A CuO nanomaterial was used to achieve MIP surface modification via co-precipitation synthesis. An MIP film was deposited by polymerizing the methacrylic acid monomer and a melamine template. The properties of the CuO nanomaterials, such as the surface morphology, chemical oxidation state, and crystalline structure, were characterized using field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction patterns (XRD), respectively. The diffuse reflection spectroscopy technique was applied to evaluate the optical properties of the CuO nanoparticles. The results indicated that the synthesized CuO nanomaterials had a monoclinic structure with an optical bandgap of 1.49 eV, which corresponds to absorbance in the visible light region. CPE electrodes with surface-modified CuO/MIP were measured using the photoelectrochemical techniques of cyclic voltammetry, differential pulse voltammetry (DPV), and amperometry. The modified CuO/MIP electrode for melamine detection in 7.4 pH PBS buffer solution exhibited a high sensitivity of 0.332 nA nM−1, with a linear range of 5.0-75.0 nM and a limit of detection of 2.45 nM. Moreover, real samples of various kinds of milk were applied to evaluate the sensing response of the prepared CuO/MIP electrode. The modified CuO/MIP electrodes could be reused seven times with good reproducibility and high selectivity for melamine detection.
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Molecularly Imprinted Polymers Near Field Communication sensors for pesticide detection
(2022-01-01)
Leepheng, Piyawan
;
Phromyothin, Darinee
;
Thanachayanont, Chanchana
;
Inpor, Kroekchai
;
Olarnwanich, Aricha
For a healthy and convenient daily lifestyle, co-development of pesticide residue detectors to integrate molecularly imprinted polymers (MIPs) modified electrodes and industrial innovative Near Field Communication (NFC) sensor for smartphones interface devices has been established. It targets cypermethrin and carbaryl which are usually detected in fruits and vegetables. Pesticide-MIPs were fabricated on commercial screen-printed electrodes (SPEs) by bulk polymeri-zation of methyl methacrylate (MMA) monomer, ethylene glycol dimethacrylate (EGDMA) cross-linker, azobis(2-methyl-propionitrile (AIBN) initiator with cypermethrin and carbaryl templates in cypermethrin-MIPs/SPE and carbaryl-MIPs/SPE, respectively. The surface morphology of modified electrodes was characterized by field-emission scanning electron microscope (FE-SEM) and atomic force microscope (AFM), which present cavities of a template on the surface of MIPs/SPE. The experiments of NFC pesticide residue detectors were conducted in real vegetable samples, where a selectivity of 32.18 μA/ppb and a detection limit of 5.4 ppb for cypermethrin-MIPs/SPE and a selectivity of 22.15 μA/ppb and a limit of detection of 9.3 ppb for carbaryl-MIPs/SPE have been obtained. The electrodes can be used four times and have more than six months storage duration.
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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.

Phromyothin, Darinee

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