title: A thick-film sensor as a novel device for determination of polyphenols and their antioxidant capacity in white wine.
abstract: A thick-film electrochemical sensor with an iridium-carbon working electrode was used for determining polyphenols and their antioxidant capacity in white wine. Caffeic acid was used as a model species because it has the ability to produce the highest oxidation current. The correlation coefficient of 0.9975 was obtained between sensor response and caffeic acid content. The total phenolic content (TPC) and scavenging activity on 1,1-diphenyl-2-pycrylhydrazyl (DPPH·) radical were also found to be strongly correlated with the concentration of caffeic acid, with a correlation coefficient of 0.9823 and 0.9958, respectively. The sensor prototype was proven to be a simple, efficient and cost effective device to evaluate the antioxidant capacity of substances.
authors.affiliation: Faculty of Agro-Industry, Chiang Mai University, Muang, Chiang Mai 50100, Thailand. kanokorn@gmail.com
authors.forename: Kanokorn
authors.initials: K
authors.lastname: Photinon
authors.forename: Yongyuth
authors.initials: Y
authors.lastname: Chalermchart
authors.forename: Chartchai
authors.initials: C
authors.lastname: Khanongnuch
authors.forename: Shih-Han
authors.initials: SH
authors.lastname: Wang
authors.forename: Chung-Chiun
authors.initials: CC
authors.lastname: Liu
mesh_terms: D000975:Antioxidants / Q000032:analysis* / Q000378:metabolism; D001713:Biphenyl Compounds / Q000737:chemistry / Q000378:metabolism; D002109:Caffeic Acids / Q000032:analysis / Q000378:metabolism; D055664:Electrochemical Techniques / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D010851:Picrates / Q000737:chemistry / Q000378:metabolism; D059808:Polyphenols / Q000032:analysis* / Q000378:metabolism; D014920:Wine / Q000032:analysis*
chemical_list: D000975:Antioxidants; D001713:Biphenyl Compounds; D002109:Caffeic Acids; D010851:Picrates; D059808:Polyphenols; C004931:1,1-diphenyl-2-picrylhydrazyl; C040048:caffeic acid