Oxidative stability of vegetable oils as affected by sesame extracts during accelerated oxidative storage

In vitro antioxidant activities and protective effects of sesame cake extract in stabilising sunflower and soybean oils were tested. Total phenolic, flavonoid and flavonol contents in the extract of sesame cake were 1.94 +/- 0.02 (mg gallic acid equivalent (GAE) g(-1) dry weight (DW)), 0.88 +/- 0.02 (mg quercetin equivalent (QE) g(-1) DW), and 0.40 +/- 0.02 (mg QE g(-1) DW), respectively. Protective effects of sesame cake extract in stabilizing sunflower and soybean oils were tested, compared to synthetic antioxidants, by measuring their peroxide values (PV), conjugated dienes (CD), conjugated trienes (CT), and p-anisidine value during accelerated storage. Results indicated that sesame cake extract exhibited stronger antioxidant activity than BHT and BHA. However, its antioxidant activity was less than that of TBHQ.