Abstract
AbstractRates of α‐tocopherol oxidation were measured for free‐radical reactions produced by Fe(III)‐catalyzed dissociations of hydroperoxides. The kinetics were treated as first‐order in α‐tocopherol. The hydroperoxides were preformed from methyl linoleate, methyl linolenate, ethyl arachidonate, methyl eicosapentaenoate, and a fraction of polyunsaturated fatty esters of menhaden oil. The degree of unsaturation of the lipid hydroperoxides had little effect on the rates of α‐tocopherol oxidation. The rates of oxidation decrease with the concentration of water and increase with the acidity of the media. The pH data suggest a transition from one predominant mechanism to another, which may involve principally acid catalysis. A mechanism for α‐tocopherol oxidation is suggested.
Published Version
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