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dc.contributor.authorAurachat Lert-itthipornen_US
dc.contributor.authorSaranya Phunpruchen_US
dc.contributor.authorMunlika Prommajunen_US
dc.contributor.authorPongpichet Srikritsadawongen_US
dc.contributor.authorNathawut Choengchanen_US
dc.identifier.citationChiang Mai Journal of Science 48, 1 (January 2021), 185-195en_US
dc.descriptionThe Chiang Mai Journal of Science is an international English language peer-reviewed journal which is published in open access electronic format 6 times a year in January, March, May, July, September and November by the Faculty of Science, Chiang Mai University. Manuscripts in most areas of science are welcomed except in areas such as agriculture, engineering and medical science which are outside the scope of the Journal. Currently, we focus on manuscripts in biology, chemistry, physics, materials science and environmental science. Papers in mathematics statistics and computer science are also included but should be of an applied nature rather than purely theoretical. Manuscripts describing experiments on humans or animals are required to provide proof that all experiments have been carried out according to the ethical regulations of the respective institutional and/or governmental authorities and this should be clearly stated in the manuscript itself. The Editor reserves the right to reject manuscripts that fail to do so.en_US
dc.description.abstractThis work presents a new method development using the gold nanoparticles (AuNPs)- bacterial cellulose (BC) nanopaper for the spectrophotometric determination of hydrogen peroxide (H2O2). 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-1 HAuCl4 (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 Au0 at 525 nm. The amount of 97.3 weight % of Au0 was found. The spectrophotometric assay was carried out by dropping the aliquots of 100 µL of sample and 400 µL of 20 mmol L-1 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 H2O2, the wine-red color of the AuNPs-BC nanopaper was turned to pale red accordingly to reduction of Auo to Au(III) by H2O2. Decreasing in the absorbance of the nanopaper at 525 nm was monitored using UV-visible spectrophotometer. Detection limit (yB + 3SB) of 0.79 % (v/v) was observed and this value was enough sensitive for the determination of H2O2 in wound cleaner and hair dye samples. The H2O2 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 H2O2 in real samples.en_US
dc.publisherFaculty of Science, Chiang Mai Universityen_US
dc.subjectgold nanoparticlesen_US
dc.subjecthydrogen peroxideen_US
dc.titlePreparation of Gold Nanoparticles-Bacterial Cellulose Nanopaper and Its Application as 2D-Microcuvette for Spectrophotometric Determination of Hydrogen Peroxideen_US
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