Effect of temperature and addition of alpha-tocopherol on the oxidation of trilinolein model systems

Lipids
Gloria Márquez-RuizC Dobarganes

Abstract

The effects of temperature and addition of alpha-tocopherol were evaluated in trilinolein model systems through quantification of oxidized TAG monomers, dimers, and polymers following oxidation at different temperatures. Samples of trilinolein without and with 250 and 500 mg/kg alpha-tocopherol added were stored at 25, 60, and 100 degrees C. Quantification of oxidized monomers, dimers, and polymers by a combination of adsorption and exclusion chromatography provided a useful measurement for studying the evolution of oxidation. Results showed that the amounts of primary oxidation compounds (trilinolein oxidized monomers) that accumulated during the induction period decreased as the temperature increased, indicating that the slope of the initial linear stage of oxidation depended on temperature. The end of the induction period was marked by a sharp increase in the levels of total oxidation compounds, the initiation of polymerization, and the loss of alpha-tocopherol. Addition of alpha-tocopherol did not prevent, but rather delayed, formation of trilinolein oxidized monomers and the initiation of polymerization.

References

Aug 1, 1969·Journal of the American Oil Chemists' Society·T P LabuzaM Karel
May 1, 1993·The American Journal of Clinical Nutrition·B Halliwell, S Chirico

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Citations

Jan 1, 2014·Antioxidants·Gloria Márquez-RuizJoaquín Velasco
Jul 17, 2007·Journal of Agricultural and Food Chemistry·Luis M Rodríguez-AlcaláJavier Fontecha
Mar 2, 2006·Journal of Agricultural and Food Chemistry·Joaquín VelascoGloria Márquez-Ruiz

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