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  • Title: Reactions of superoxide ion with tocopherol and its model compounds: correlation between the physiological activities of tocopherols and the concentration of chromanoxyl-type radicals.
    Author: Ozawa T, Hanaki A, Matsuo M.
    Journal: Biochem Int; 1983 May; 6(5):685-92. PubMed ID: 6091656.
    Abstract:
    Reactions of tocopherol model compounds with superoxide ion (02-) were investigated. 6-Hydroxy-2,2,5,7,8-pentamethylchroman (alpha-model), 6-hydroxy-2,2,5,7-tetramethylchroman and 6-hydroxy-2,2,5,8-tetramethylchroman (beta-model) were oxidized by O2- to yield chromanoxyl radicals which gave ESR spectra, but the radical species were not obtained from 6-hydroxy-2,2,7,8-tetramethylchroman (gamma-model) and 6-hydroxy-2,2-dimethylchroman, both of which do not have a methyl substituent at the C-5 position. ESR studies of the reactions of O2- with tocopherols or their model compounds indicate that the radical concentrations from tocopherol models correlate with the physiological activities of the tocopherols.
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