Abstract
The rate of quenching of 1 O 2 by 17 kinds of tocopherol derivatives, including α, β-, γ-, and δ-tocopherols, and five structurally related phenols has been measured spectrophotometrically in ethanol at 35 o C. The result indicates that the overall rate constants, k Q (k Q =k q +k r , physical 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, k Q , was found to correlate with their half-peak oxidation potentials, E P/2 ; the tocopherols that have smaller E P/2 values show higher reactivities
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