Effect of ultrasound treatment on oxidative stability of sunflower oil and palm oil

This study aims to investigate the effect of sonication time (2-120 mins) on lipid oxidation and accelerated storage of ultrasound treated sunflower oil (UTSO) and ultrasound treated palm oil (UTPO). Peroxide values (PV) of UTSO and UTPO were measured to assess the oxidative stability of sunflower oil and palm oil. Accelerated storage of UTSO and UTPO were conducted for 24 days at 60oC with a 6-days-intervals analysis The PV increased gradually with the increasing sonication time and reached the highest PV of 10.25 and 5.67 meq peroxides/ kg in UTSO and UTPO, respectively. The UTPO exhibited higher PV (44.67 meq peroxides/ kg) than UTSO (19.91 meq peroxides/kg) upon accelerated storage. No significant (p > 0.05) difference was observed on the quality of UTSO and UTPO with their controls after 24 days of accelerated storage. Results of this study demonstrated that ultrasound (US) treatment via ultrasonic bath accelerates lipid oxidation process without significant impact on the generation of lipid oxidation by-products during prolonged storage.