Choengchan, Nathawut

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Preferred name
Choengchan, Nathawut
Alternative Name
Choengchan, N.
Choengchan, Nuthawut
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Email
nathawut.ch@kmitl.ac.th

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    Item type:Publication,
    Colorimetric sensor using silver nanoparticles for determination of hydrogen peroxide based on a flow injection system
    (2013-09-01)
    Teerasong, Saowapak
    ;
    Sonsa-Ard, Thitaporn
    ;
    Vimolkanjana, Chavin
    ;
    Choengchan, Nathawut
    ;
    Chompoosor, Apiwat
    In this work, a colorimetric probe using a flow injection (FI) system and silver nanoparticles (AgNPs) was developed for determination of hydrogen peroxide (H2O2) concentration. AgNPs have catalytic ability for decomposition of H2O2, producing silver ions and superoxide. The reaction mechanism of H2O2 and AgNPs at various concentrations is described. H2O2 concentration was quantified by monitoring decrease in AgNPs surface plasmon resonance during the decomposition reaction. Under the optimum condition, the detection limit for H2O2 was 0.6 mg/l. The flow system developed in this study provided good precision of analysis (relative standard deviation = 2.97%) with high throughput (18 samples/h). This method was successfully applied to analysis of H2O2 in pharmaceutical and household products. Therefore, the method is feasible for on-line monitoring H2O2 in manufacturing process quality control. © Copyright 2013 American Scientific Publishers All rights reserved.
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    Item type:Publication,
    Preparation of gold nanoparticles-bacterial cellulose nanopaper and its application as 2D-microcuvette for spectrophotometric determination of hydrogen peroxide
    (2021-01-01)
    Lert-Itthiporn, Aurachat
    ;
    Phunpruch, Saranya
    ;
    Prommajun, Munlika
    ;
    Srikritsadawong, Pongpichet
    ;
    Choengchan, Nathawut
    This work presents a new method development using the gold nanoparticles (AuNPs)-bacterial cellulose (BC) nanopaper for the spectrophotometric determination of hydrogen peroxide (H<inf>2</inf>O<inf>2</inf>). The AuNPs were embedded in the BC nanopaper, where the nanopaper played two roles as both the reducing agent and the template for the as-prepared AuNPs. The preparation process was started by putting the wet bare BC nanopaper (Ø 30 mm and 3 mm thickness) into 0.75 mmol L<sup>-1</sup> HAuCl<inf>4</inf> (25.0 mL). This solution was vigorously and continuously stirred for 60 min at 90ºC. After the embedding process, color of the nanopaper was changed from milky-white to wine-red. The AuNPs-BC nanopaper was characterized by UV-visible spectrophotometer, FE-SEM and EDS. Absorption spectrum of the nanopaper showed the characteristic peak of Au<sup>0</sup> at 525 nm. The amount of 97.3 weight % of Au<sup>0</sup> was found. The spectrophotometric assay was carried out by dropping the aliquots of 100 µL of sample and 400 µL of 20 mmol L<sup>-1</sup> citrate buffer (pH 6.0) onto the AuNPs-BC nanopaper. The nanopaper was then kept in a plastic back for 10 min. In the presence of H<inf>2</inf>O<inf>2</inf>, the wine-red color of the AuNPs-BC nanopaper was turned to pale red accordingly to reduction of Au<sup>o</sup> to Au(III) by H<inf>2</inf>O<inf>2</inf>. Decreasing in the absorbance of the nanopaper at 525 nm was monitored using UV-visible spectrophotometer. Detection limit (y<inf>B</inf> + 3S<inf>B</inf>) of 0.79 % (v/v) was observed and this value was enough sensitive for the determination of H<inf>2</inf>O<inf>2</inf> in wound cleaner and hair dye samples. The H<inf>2</inf>O<inf>2</inf> contents in all samples were agreed well with the label values. Good analytical recovery (88.8 to 97.2 %) with high precision (RSD: 3.3 %) were obtained. These results confirmed that the as-prepared nanopaper was successfully synthesized and was effectively applied as the two dimensional (2D)-microcuvette for the spectrophotometric determination of H<inf>2</inf>O<inf>2</inf> in real samples.