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dc.contributor.authorSousa, W. R.
dc.contributor.authorda Rocha, C.
dc.contributor.authorCardoso, C. L.
dc.contributor.authorSilva, DHS
dc.contributor.authorZanoni, Maria Valnice Boldrin [UNESP]
dc.identifier.citationJournal of Food Composition and Analysis. San Diego: Academic Press Inc. Elsevier B.V., v. 17, n. 5, p. 619-633, 2004.
dc.description.abstractThe electrochemical oxidation of caffeic, chlorogenic, sinapic, ferulic and p-coumaric acids was investigated by cyclic voltammetry on acetate buffer pH 5.6 on glassy carbon electrode and modified glassy carbon electrode. According to their voltammetric behavior, the antioxidant activity of these phenolic acids was evaluated and the results pointed to the following sequence: caffeic acid (E-a = +0.31 V) > chlorogenic acid (+ 0.38 V) > sinapic acid (+ 0.45 V) > ferulic acid (+ 0.53 V) >p-coumaric acid (+ 0.73 V). The results were confirmed by DPPH test, which evidenced the strongest antiradical activity for compounds possessing the cathecol moiety (caffeic and chlorogenic acids). Linear calibration graphs were obtained for their determination at concentrations from 1 x 10(-4) to 1 x 10(-3) mol L-1. The method was applied to orange juice. Selectivity was illustrated by the analysis of caffeic and chlorogenic acids electrodeposited on a glassy carbon electrode previously modified by electrochemical activation in the presence of ascorbic acid. (C) 2003 Elsevier B.V. All rights reserved.en
dc.publisherElsevier B.V.
dc.relation.ispartofJournal of Food Composition and Analysis
dc.sourceWeb of Science
dc.subjectphenolic antioxidantspt
dc.subjectvoltammetric methodspt
dc.subjectelectrochemical oxidationpt
dc.subjectorange juicept
dc.titleDetermination of the relative contribution of phenolic antioxidants in orange juice by voltammetric methodsen
dcterms.rightsHolderElsevier B.V.
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.description.affiliationUniv Estadual Paulista, UNESP, Inst Quim, BR-14801970 Araraquara, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, UNESP, Inst Quim, BR-14801970 Araraquara, SP, Brazil
dc.rights.accessRightsAcesso restrito
unesp.campusUniversidade Estadual Paulista (UNESP), Instituto de Química, Araraquarapt
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