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Article Dans Une Revue Analytical Chemistry Année : 2010

How do phenolic compounds react toward superoxide ion? A simple electrochemical method for evaluating antioxidant capacity.

Résumé

The reactivities of different phenols and polyphenols versus superoxide ion (O₂(*-)) were investigated as an easy-to-handle electrochemical method for evaluating antioxidant capacities. In view of this application, the O₂/O₂(*-) couple and associated reactions between O₂(*-) and polyphenols (or phenols) were examined in an aprotic solvent [dimethylformamide (DMF)] by cyclic voltammetry. Comparisons based on simple criteria (reversibility of the O₂ reduction in the presence of the phenolic compound, electron stoichiometry, or apparent kinetic constants) allow discriminations between the possible mechanistic pathways (acid-base or radical reaction type). The results highlight that the proton-transfer and radical-transfer pathways are both present for monophenols and polyphenols, with the relative contributions of the two pathways depending on the phenol structure. In agreement with the literature, polyphenols containing an o-diphenol ring (as in flavonoids) were found to present the highest reactivities.

Domaines

Matériaux
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Dates et versions

hal-00839943 , version 1 (01-07-2013)

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Alice René, Marie-Laurence Abasq, Didier Hauchard, Philippe Hapiot. How do phenolic compounds react toward superoxide ion? A simple electrochemical method for evaluating antioxidant capacity.. Analytical Chemistry, 2010, 82 (20), pp.8703-10. ⟨10.1021/ac101854w⟩. ⟨hal-00839943⟩
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