Thermal kinetic parameters of fish oil oxidation, as affected by o-hydroxyl, o-methoxy, and alkyl ester derivatives of p-hydroxybenzoic acid in various concentrations (0.02 – 0.16%) at 35 – 55 °C, were calculated. The average extent of increase (2 – 10%) in the values of free energy of activation, ∆G++, as well as the average extent of change in the Arrhenius equation parameters, including activation energy (Ea, –40.5 to 13.6%) and frequency factor (A, – 55.0 to 4.3%), could be employed well to show structure-based performance of antioxidants. Temperature coefficient (TC) and Q10 number, which were considered as the quantitative measures of thermal sensitivity of the lipid system, showed changes from –40.3 and –27.2% to 13.5 and 11.5%, respectively, in the presence of the antioxidants.

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