Document Detail


Redox behaviour of verbascoside and rosmarinic acid.
MedLine Citation:
PMID:  23092164     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The electrochemical oxidation mechanisms of rosmarinic acid (RA) and verbascoside (VB), both caffeic acid esters with two catechol moieties, was investigated. The redox mechanism is associated with the oxidation of the catechol groups, and it was studied for a wide pH range by cyclic, differential pulse and square wave voltammetry, using a glassy carbon electrode. The voltammetric study revealed that both molecules, RA and VB, are reversibly oxidized in two successive pH-dependent steps each with the transfer of two electrons and two protons. Moreover, it was found that the first oxidation step is associated with the caffeic acid moiety, whereas the second oxidation step corresponds to the oxidation in VB of the hydroxytyrosol group and in RA of the 3,4-dihydroxyphenyl lactic acid residue.
Authors:
Eric de Souza Gil; Teodor Adrian Enache; Ana Maria Oliveira-Brett
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-18
Journal Detail:
Title:  Combinatorial chemistry & high throughput screening     Volume:  -     ISSN:  1875-5402     ISO Abbreviation:  Comb. Chem. High Throughput Screen.     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-24     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9810948     Medline TA:  Comb Chem High Throughput Screen     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade de Coimbra, 3004-535 Coimbra, Portugal. brett@ci.uc.pt.
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