Abstract
The electrochemical oxidation of 3-hydroxyflavone, 6-hydroxyflavone and 2',3,4',5,7-pentahydroxyflavone (Morin) on a glassy carbon electrode have been studied, using cyclic and square-wave voltammetry techniques, over a wide pH interval. The study reveals that the mechanism of electron transfer is a complex and pH dependent process. The oxidation of 3-hydroxyflavone showed two peaks in acidic medium corresponding to the oxidation of OH group at C-3 and OH group at C-4, according with the equilibrium between the neutral and cationic species (Scheme 2). The 6-hydroxyflavone only exhibit one peak in all pH range, corresponding to the oxidation of OH group at C-6. The oxidation mechanism of Morin proceeds in sequential steps, related with the OH groups in the resorcinol moiety at ring B and OH group at C-3 of the flavonoid structure. The chemical and electrochemical optimal conditions for simultaneous determination of these flavonoids are described.
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