Conclusions
In this study, we investigated the physicochemical changes of LOOH molecules during bulk oil peroxidation. The hydroperoxide molecules are surface-active agents that in the presence of the enhancing water content during oxidation decrease the interfacial tension of peroxidized bulk oils. Our results indicated that hydroperoxide molecules during oxidation form reverse micelles that after the induction period grow in size and number, causing the flocculation of hydroperoxide reverse micelles that are disintegrated and decomposed into secondary oxidation products in the propagation phase. Therefore, the addition of any antioxidant agents of surface-active can impact the behavior of hydroperoxide molecules and their catalytic roles. Hence, the effect of alkyl chain length on surface-active properties as well as the interfacial performance of gallic acid ester derivatives in peroxidized bulk oil was evaluated through physicochemical analysis. Our findings showed that the addition of gallic acid ester derivatives, especially methyl gallate, were decreased hydroperoxides molecule concentration in the reaction medium and also reduced their oxidative collisions. Thus, the esterification of phenolic agents with optimum alkyl chain length can maximize exploitation of innate activities of antioxidative compounds by suitable partitioning into the water-oil interfaces and better packing of hydroperoxide molecules at interfacial way.