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Radical Scavenging Activity of Antioxidants by Cyclic Voltammetry
Author(s) -
Haque Md Azizul,
Morozova Ksenia,
Lawrence Nathan,
Ferrentino Giovanna,
Scampicchio Matteo
Publication year - 2021
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.202060245
Subject(s) - chemistry , hydroxytyrosol , radical , cyclic voltammetry , caffeic acid , oleuropein , antioxidant , reaction rate constant , tocopherol , catechin , organic chemistry , voltammetry , polyphenol , vitamin e , kinetics , electrochemistry , electrode , physics , quantum mechanics
This work investigates the reactivity of individual antioxidants with the free radicals generated by 2,2′‐azobis(isobutironitrile) (AIBN). The consumption of antioxidants was followed by cyclic voltammetry. The fitting of such decay with a kinetic model yielded the rate constant k d of radical formation and the rate constant k i n hof radical inhibition exerted by each antioxidant. The antioxidant efficiency was defined as the ratio between k i n hand k d . The following ranking of antioxidants was obtained: α‐tocopherol≫catechin≫retinyl acetate≫hydroxytyrosol≫oleuropein≫caffeic acid. Overall, the approach shows the utility of cyclic voltammetry to investigate the kinetic rates at which antioxidants react with radicals.