Oxidation of linoleic acid and methyl linoleate mixed with saturated fatty acid or its methyl ester

The oxidation process of linoleic acid or methyl linoleate mixed with a saturated fatty acid or its methyl ester could be expressed by a rate expression of the autocatalytic type as well as that of the fatty, acid alone. The rate constant for linoleic acid when with a saturated fatty acid or its methyl ester- was proportional to the molar fraction of the linoleic acid This is also the case for methyl linoleate mixed with the saturated fatty acid methyl ester. When methyl linoleate was mixed with a saturated fatty acid, its oxidation was Promoted by the fatty acid. The apparent activation energies and the frequency factors for the rate constants for the oxidation of linoleic acid and methyl linoleate mixed with lauric acid were estimated. Front these two obtained parameters and those reported previously, it was demonstrated that the enthalpy-entropy compensation held during the oxidation of linoleic acid and methyl linoleate even in the presence of a saturated fatty acid. (C) 2001 Academic Press.