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Antioxidant activity of (+)-catechin. Rate constant for hydrogen-atom transfer to peroxyl radicals

Author:
Pedrielli, Pamela, Holkeri, Laura M., Skibsted, Leif H.
Source:
European food research & technology 2001 v.213 no.4-5 pp. 405-408
ISSN:
1438-2377
Subject:
alpha-tocopherol, antioxidant activity, antioxidants, epicatechin, free radicals, oxygen consumption
Abstract:
(+)-Catechin reduced the oxygen consumption rate of a peroxidizing methyl linoleate solution in the hydrogen-bond-accepting solvent tert-butanol, as measured by oximetry (ESR signal linewidth). In contrast to α-tocopherol, no induction period was seen for (+)-catechin. The rate constant for hydrogen-atom transfer from (+)-catechin to lipid peroxyl radicals was determined to be kᵢₙₕ=(1.45±0.20)·10⁴M⁻¹s⁻¹at 50 °C, a value smaller by a factor of 40 compared to α-tocopherol, but comparable to the same rate constant for synthetic antioxidants and quercetin and the epimeric epicatechin.
Agid:
624670