The oxidation kinetics of the purified triacylglycerols of olive, canola, and fish oils as affected by different concentrations of hydroxytyrosol were studied at 60–100 °C. On average, hydroxytyrosol improved the temperature susceptibility (temperature coefficient, TC, and Q10 number) of olive oil, whereas opposite results were observed for canola and fish oils. Despite the results observed in canola and fish oils, hydroxytyrosol caused much greater changes in the Arrhenius equation parameters (activation energy, Ea, and frequency factor, A) for the oxidation of olive oil. On the whole, the highest increase in the Gibbs free energy, ΔG++, of the activated complex formation as affected by the antioxidant was for olive (9.7%), canola (8.9%), and fish (5.7%) oils, respectively.
The autoxidation of purified triacylglycerols obtained from fish, canola, and olive oils in the presence of different concentrations of hydroxytyrosol at 60–100 °C was evaluated by different kinetic parameters including the stabilizing factor (F) as a measure of effectiveness, the oxidation rate ratio (ORR) as a measure strength, and the antioxidant activity (A) which combines the F and ORR parameters. The overall performance of hydroxytyrosol was attributed to the main reaction of chain termination (ROO·+0.333333emInH0.333333em→ROOH0.333333em+0.333333emIn·) as competed with the main oxidation reaction of chain propagation (ROO·+0.333333emRH→ROOH0.333333em+R·) and, additionally, the antioxidative side reactions of chain propagation (In·+0.333333emROO·→In‐OOR and In·+0.333333emIn·→products), and the pro‐oxidative side reaction of chain initiation (InH0.333333em+0.333333emROOH→In·+0.333333emRO·+H2O) in some cases.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.