Abstract
In this study, lecithin (as a surfactant) was added to promote the inhibitory-mechanism of γ-oryzanol, ethyl-ferulate and ferulic acid (based on the interfacial phenomena) so as to inhibit the oxidation of stripped sunflower oil. Monitoring the amount of water production as a byproduct of oxidation showed that the water content of the lipid system increased remarkably through the oxidation progress. Lecithin enhanced the critical concentration of hydroperoxides in reverse micelles, compared to the basic state (14.8 vs. 9.2 mM), thereby improving the hydrogen-donating mechanism of antioxidants. The size of reverse micelles increased progressively during the oxidation, while two breakpoints were pointed out in the micelles growth, i.e. at the end of the initiation and the propagation phases. Based on the kinetic data, ferulic acid showed the highest antioxidant activity (23.4), compared to ethyl-ferulate (15.5) and γ-oryzanol (13.7). Generally, lecithin enhanced antioxidant activity (~ 65%) by improving the interfacial performance of antioxidants.
Highlights
In this study, lecithin was added to promote the inhibitory-mechanism of γ-oryzanol, ethyl-ferulate and ferulic acid so as to inhibit the oxidation of stripped sunflower oil
The present study aimed to investigate the antioxidant activity of Ferulic acid (FRA) and its derivatives with different alkyl chains (EFR and gamma oryzanol (GOR)) in the presence of LEC to elucidate the effects of interfacial phenomena on bulk oil peroxidation
The highest level was found in the FRA, followed by Ethyl ferulate (EFR) and GOR
Summary
The slope of ROOHs production continues to increase until it reaches its highest level in the middle of the propagation phase From this point onwards, known as the turning point or the maximum rate (MR), the decomposition reaction of ROOHs begins[4]. As oxidation progresses further and adds to the production of ROOHs, the number of micelles and their size increase until they reach a critical micellar concentration (CMC), followed by an eventual collapse This point is exactly equal to R OOHIP wherein the oxidation process enters the propagation phase by releasing a large volume of ROOHs throughout the environment and optimizes collisions between free radicals[16].
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