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.