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.