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Anodic Behaviour of Flavonoids Orientin, Eriodictyol and Robinin at a Glassy Carbon Electrode
Author(s) -
de Souza Gil Eric,
Enache Adrian Teodor,
de OliveiraBrett Ana Maria
Publication year - 2012
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201200211
Subject(s) - orientin , chemistry , redox , eriodictyol , catechol , electrochemistry , glassy carbon , inorganic chemistry , photochemistry , antioxidant , electrode , cyclic voltammetry , organic chemistry , flavonoid , naringenin , vitexin
Orientin, eriodictyol and robinin are polyphenolic compounds, and their oxidation mechanism is pH‐dependent, in two steps, involving a different number of electrons and protons. Orientin and eriodictyol first oxidation occurs at a lower potential, corresponding to the reversible oxidation of the catechol group, and is followed by an irreversible oxidation on the ring‐A at more positive potential. Robenin oxidation is irreversible, with the formation of electroactive products, and occurs at ring‐A and ring‐B. The electrochemical characterization of their redox behaviour brought useful data about their chemical stability, antioxidant and pro‐oxidant activity, enabling a comprehensive understanding of their redox mechanism.