Please use this identifier to cite or link to this item: http://cmuir.cmu.ac.th/jspui/handle/6653943832/58466
Title: A cost-effective assay for antioxidant using simple cotton thread combining paper based device with mobile phone detection
Authors: Suphasinee Sateanchok
Sunanta Wangkarn
Chalermpong Saenjum
Kate Grudpan
Keywords: Chemistry
Biochemistry, Genetics and Molecular Biology
Issue Date: 15-Jan-2018
Abstract: © 2017 Elsevier B.V. A cost-effective assay for antioxidant using simple cotton thread combining paper based device with mobile phone detection has been investigated. Standard and sample solutions flow along a bunch of cotton thread treated with sodium hydroxide via microfluidic behaviors without external pumping. The analyte solution reacts with the reagents that have been immobilized on the paper strip fixed at the end of the cotton bunch. The developed platforms were used for the assays of total phenolic content and antioxidant capacity by employing Folin-Ciocalteu and 2, 2-diphenyl-1-picryhydrazyl (DPPH) respectively. Simple detection can be made by employing a mobile phone camera (iPhone 4S) with Image J or Photoshop for image processing and evaluation. Gallic acid was used as a reference standard in this work, as its polyphenol structures can be found in many plants. The total phenolic content is expressed as gallic acid equivalents (GAE) (mg/g material). Inhibition capacity is calculated by the equation: % I = [(Io– Is)/ Io] × 100, where Isis the relative magenta intensity (CMYK mode) of sample, and Iothe relative magenta intensity of DPPH•. IC50inhibition can be estimated from the graph and can be used for the antioxidant capacity consideration. Applications to the assay green tea samples were demonstrated. The total phenolic contents in the green tea samples were found to be 48–105 mg/g, with %RSD of less than 10 for that of higher 50 GAE mg/g and IC50values of the samples studied were 25–50 mg/L. The results obtained by the developed methods agree with that of the standard methods.
URI: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85028609075&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/58466
ISSN: 00399140
Appears in Collections:CMUL: Journal Articles

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