Redox Behaviour of Verbascoside and Rosmarinic Acid

Author(s): Eric de Souza Gil, Teodor Adrian Enache, Ana Maria Oliveira-Brett.

Journal Name: Combinatorial Chemistry & High Throughput Screening

Volume 16 , Issue 2 , 2013

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The electrochemical oxidation mechanisms of rosmarinic acid (RA) and verbascoside (VB), both caffeic acid esters with two catechol moieties, were investigated. The redox mechanism is associated with the oxidation of the catechol groups, and was studied over 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.

Keywords: Acteoside, caffeic acid, cinnamic acid derivatives, electrochemical characterization, hydroxytyrosol, phenylpropanoid glycosides, voltammetry, erbascoside, rosmarinic acid, hydroxytyrosol, caffeic acid.

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Article Details

Year: 2013
Page: [92 - 97]
Pages: 6
DOI: 10.2174/1386207311316020003
Price: $58

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