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

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Journal of the American Oil Chemists Society

Abstract

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

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Authors and Affiliations

  1. Laboratoire de Botanique et de Biologie Cellulaire 2, Avenue du Professeur Léon Bernard, 35043, Rennes Cedex, France

    J. P. Koskas, J. Cillard & P. Cillard

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  1. J. P. Koskas
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  2. J. Cillard
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  3. P. Cillard
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Koskas, J.P., Cillard, J. & Cillard, P. Autoxidation of linoleic acid and behavior of its hydroperoxides with and without tocopherols. J Am Oil Chem Soc 61, 1466–1469 (1984). https://doi.org/10.1007/BF02636367

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  • DOI: https://doi.org/10.1007/BF02636367

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