THE ABILITY OF OLIVE LEAF EXTRCATS TO ENHANCE THE OXIDATIVE STABILITY OF SUNFLOWER OIL | ||||
| Journal of Agricultural Chemistry and Biotechnology | ||||
| Article 1, Volume 4, Issue 11, November 2013, Page 359-369 PDF (676.94 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jacb.2013.53300 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| M.SH. Hassan; M.M. ELsayed; A. M. Zaki; F.S. Hatour; Hanaa S. S. Gazwy | ||||
| Agric. Chem. Dept. Fac. OF Agric. , MInia Univ. , ELminia Egypt | ||||
| Abstract | ||||
| The present study was undertaken to evaluate the potential of antioxidant activity of olive leaf extracts ( OLEs ) and compared with other natural or synthetic antioxidants . Different extracts in term of antioxidant properties were studied . Three extracts of olive leaf were obtained by using ethanol , methanol and water .So, the aim of this study was to assess the effectiveness of such extracts and compared it with other antioxidants such as green tea extract , TBHQ , citric acid on the oxidative stability of sunflower oil during storage at an oven at 63±1°C for 0, 5, 10, 15, 20 days. To follow the relative of oxidative deterioration of sunflower oil , as well as deteriming the antioxidative activity of various samples. Oils were analyzed periodically for their peroxide value (PV) , iodine value ( IV ) , acid value (AV ) and thiobarbituric acid (T.B.A.). Analysis of heated sunflower oils demonstrated significant increases in PV and AV and T.B.A . However , IV of the oils were markedly decreased. On the other hand , ethanol extract exhibited the highest antiradical activity among solvents. Results also showed that the three extracts of olive leaf ( i.e. methanolic- , ethanolic- and water- olive leaf extracts) secured protective effect against oxidation of sunflower oil and can serve as substitutes for synthetic antioxidants . | ||||
| Keywords | ||||
| antioxidants; sunflower oil; olive leaf extracts; Heat treatment | ||||
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