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Oxidation Pathways of Catechin at Various pH Studied by Cyclic Voltammetry and PM3 Semi-empirical Calculations (CROSBI ID 506228)

Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | domaća recenzija

Martinez, Sanja ; Valek, Lidija ; Petrović, Željka ; Metikoš-Huković, Mirjana Oxidation Pathways of Catechin at Various pH Studied by Cyclic Voltammetry and PM3 Semi-empirical Calculations // XIX. hrvatski skup kemičara i kemijskih inženjera : Knjiga sažetaka / Škare, D. ; Rapić, V. ; Rogošić, M. (ur.). Zagreb: Sveučilišna tiskara, 2005. str. 150-150-x

Podaci o odgovornosti

Martinez, Sanja ; Valek, Lidija ; Petrović, Željka ; Metikoš-Huković, Mirjana

engleski

Oxidation Pathways of Catechin at Various pH Studied by Cyclic Voltammetry and PM3 Semi-empirical Calculations

Catechin is frequently used as a phenolic standard in quantification of antioxidative activity and its oxidation mechanism is of interest [1]. It is a representative of a large family of compounds that have the structure of flavone (2-phenyl-chromone) constituted by the two benzene rings (A and B) joined together by a g -pyrone ring (C ring). The basic skeleton suffers a great number of substitutions in the natural compounds and over 4000 different flavanoids are known today. Antioxidant power of a polyphenol in a reaction with a free radical is directly correlated to its ability to act as a reducing agent at an electrode. Although the pK_a values of many polyphenolic compounds, including catechin, are well within the physiological pH range, the influence of pH on the antioxidant activity, determined by chemical or electrochemical methods, has been recognized only in limited number of papers dealing with the subject [2]. In general, a wide span of pH is of interest, including the stomach acid pH 2, wine pH 3.6 and physiological pH 7.4. The motivation of the research was a desire to understand more fully the mechanisms of catechin oxidation at various pH with emphasis on the molecular properties that dictate the chemical and electrochemical oxidation pathways. Catechin oxidation has been investigated by cyclic voltammetry (CV) on a glassy carbon electrode in a pH range of 2-7.4. Based on the parameters deduced from the voltammetric measurements and those calculated by PM3 semiempirical method, the electrochemical oxidation pathway of catechin has been suggested. Possible implications of pH change on the CV method of measuring antioxidant activity are also discussed.

catehin; oxidation; cyclic voltammetry

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Podaci o prilogu

150-150-x.

2005.

objavljeno

Podaci o matičnoj publikaciji

XIX. hrvatski skup kemičara i kemijskih inženjera : Knjiga sažetaka

Škare, D. ; Rapić, V. ; Rogošić, M.

Zagreb: Sveučilišna tiskara

Podaci o skupu

XIX Hrvatski skup kemičara i kemijskih inženjera

poster

24.04.2005-27.04.2005

Opatija, Hrvatska

Povezanost rada

Kemija, Kemijsko inženjerstvo