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• W2013452332 abstract "The rate of quenching of 1O2 by 5 kinds of biological hydroquinone, such as ubiquinol-10 (1), ubiquinol-0 (2), α-, β- and γ-tocophenol hydroquinones (plastoquinol model) (3–5) and six structurally related hydroquinones has been measured spectrophotometrically in ethanol at 35°C. The result indicates that the overall rate constants, kQ(kQ = kq + kr hysical quenching + chemical reaction), increase as the total electron-donating capacity of the alkyl substituents on the aromatic ring increases. The log of the rate constants, kQ, was found to correlate with their peak oxidation potentials, Ep; the hydroquinones which have smaller Ep values show higher reactivities. The rates (kQ) of quenching of 1O2 by biological hydroquinones 1–5 were found to be 23–55% smaller than that by α-tocopherol, which has the highest antioxidant activity among natural tocophenols and related phenols. However, the difference in the rate constants is less than one order of magnitude. The result suggests that these biological hydroquinones may relate to the quenching of the singlet oxygen in biological systems." @default.
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• W2013452332 date "1993-12-01" @default.
• W2013452332 modified "2023-10-16" @default.
• W2013452332 title "Kinetic study of the quenching reaction of singlet oxygen by biological hydroquinones and related compounds" @default.
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• W2013452332 doi "https://doi.org/10.1016/0005-2728(93)90234-7" @default.
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