Autoxidation of linoleic acid and behavior of its hydroperoxides with and without tocopherols

摘要: The autoxidation of linoleic acid dispersed in an aqueous media and the effect α-, γ- δ-tocopherols were studied. quantitative analysis hydroperoxide isomers (13-cis,trans; 13-trans,trans; 9-trans,cis; 9-trans,trans) by direct high-performance liquid chromatography exhibited a prooxidant activity α-tocopherol at high concentration (3.8% weight acid). On other hand, lower concentrations (0.38 0.038%) (3.8%) antioxidant. Furthermore, addition tocopherols modified distribution geometrical isomers. formation thetrans,trans was completely inhibited highest three independently their antioxidant or only delayed α-tocopherol. to reduced decomposition rate these order < γ-tocopherol δ-tocopherol for thecis,trans isomer ≪ ⋍ isomer. With hydroperoxides, as during autoxidation, oxidized whatever its initial concentration, while underwent partial oxidation practically unchanged.