The impact of Senjed (Elaeagnus angustifolia L.) peel aqueous extract on qualitative properties of cold-pressed sesame oil

Abstract

The Senjed peel aqueous extract was added to sesame cold-pressed oil at different concentration of 0, 100, 200, 500 and 750 mg/kg and compared with TBHQ (200 mg/kg). The Senjed peel aqueous extract showed 9.55 ± 0.35% extraction yield, 58.17 ± 2.33% antioxidant activity, 573.31 ± 3.57 (mg GAE/100 g FW) total phenolic content, and 151.33 ± 2.67 (mg CAE/100 g FW) total flavonoid content. The extract preserved 59.08% of antioxidant activity after heating at 185 ℃ for 80 min. Increasing the concentration of the extract caused a significant (p<0.05) qualitative improvement in the oil samples. At all storage times, the highest FFA%, peroxide and P-anisidine value belonged to oil samples containing 0 ppm of Senjed peel aqueous extract and followed by 100, 200, 500 and 750 ppm, respectively. The highest oxidative stability index was observed in oil samples containing TBHQ and 750 mg/kg concentration of extract (both 15.39 h). Oil samples containing 750 ppm of Senjed peel aqueous extract and TBHQ showed almost similar qualitative characteristics. Results showed that Senjed peel aqueous extract have antioxidant potential for stabilization of oils.