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The oxidation mechanism of the antioxidant quercetin in nonaqueous media

SYSNO ASEP	0361653
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	The oxidation mechanism of the antioxidant quercetin in nonaqueous media
Author(s)	Sokolová, Romana (UFCH-W)_{RID, ORCID, SAI} Degano, I. (IT) Ramešová, Šárka (UFCH-W)_RID Kocábová, Jana (UFCH-W)_RID Hromadová, Magdaléna (UFCH-W)_{RID, ORCID, SAI} Gál, Miroslav (UFCH-W) Fiedler, Jan (UFCH-W)_{RID, ORCID} Valášek, Michal (UOCHB-X)
Source Title	Electrochimica acta. - : Elsevier - ISSN 0013-4686 Roč. 56, č. 21 (2011), s. 7421-7427
Number of pages	7 s.
Language	eng - English
Country	GB - United Kingdom
Keywords	cyclic voltammetry ; electron transfer ; flavonoids
Subject RIV	CG - Electrochemistry
R&D Projects	GA203/09/1607 GA ČR - Czech Science Foundation (CSF)
	GA203/08/1157 GA ČR - Czech Science Foundation (CSF)
	OC 140 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
CEZ	AV0Z40400503 - UFCH-W (2005-2011)
	AV0Z40550506 - UOCHB-X (2005-2011)
UT WOS	000294982700025
DOI	10.1016/j.electacta.2011.04.121
Annotation	The knowledge of the degradation pathways of natural dyes used in medieval textiles is necessary for the restoration of their original color. Quercetin, one of such colorants, reportedly yields the wide spectrum of oxidation products in different types of media. This study deals with electrochemical oxidation mechanism of quercetin in nonaqueous solution, which has not been yet attempted. The final oxidation product at the first oxidation wave was identified by HPLC-DAD and GC–MS techniques as 2-(3′,4′-dihydroxybenzoyl)-2,4,6-trihydroxybenzofuran-3(2H)-one. The apparent two-electron process at the potential of the first oxidation wave yields current–voltage shapes with one-electron characteristics. The in situ spectroelectrochemistry measurements proved the oxidation mechanism leading through a short-lived anion radical.
Workplace	J. Heyrovsky Institute of Physical Chemistry
Contact	Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196
Year of Publishing	2012

Number of the records: 1