Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/8295
Title: Electrochemical Oxidation of Quercetin
Authors: Brett, Ana Maria Oliveira 
Ghica, Mariana-Emilia 
Issue Date: 2003
Citation: Electroanalysis. 15:22 (2003) 1745-1750
Abstract: The mechanism of electrochemical oxidation of quercetin on a glassy carbon electrode has been studied using cyclic, differential pulse and square-wave voltammetry at different pH. It proceeds in a cascade mechanism, related with the two catechol hydroxyl groups and the other three hydroxyl groups which all present electroactivity, and the oxidation is pH dependent. Quercetin also adsorbs strongly on the electrode surface; and the final oxidation product is not electroactive and blocks the electrode surface. The oxidation of the catechol 3prime,4prime-dihydroxyl electron-donating groups, occurs first, at very low positive potentials, and is a two electron two proton reversible reaction. The hydroxyl group oxidized next was shown to undergo an irreversible oxidation reaction, and this hydroxyl group can form a intermolecular hydrogen bond with the neighboring oxygen. The other two hydroxyl groups also have an electron donating effect and their oxidation is reversible.
URI: http://hdl.handle.net/10316/8295
DOI: 10.1002/elan.200302800
Rights: openAccess
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais

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