DRUMSTICK (MORINGA OLEIFERA L.) LEAVES: A POTENTIAL SOURCE OF NATURAL LIPID ANTIOXIDANTS

摘要

Antioxidant activity of methanolic extract of drumstick leaves (200, 500nand 1,000 ppm) in soybean oil was assessed by an accelerated oxidation testn(70C, 10 days) and a heating test (180C, 1 h). The extract significantlyn(P u0002 0.05) suppressed the formation of peroxides and thiobarbituric acidreactivensubstances (TBARS) during accelerated oxidation, even at a level ofn200 ppm. On heating test, conjugated dienes, conjugated trienes and TBARSnvalues of the oil treated with the extract were significantly (P u0002 0.05) lowernthan those of the control sample (oil without any antioxidant/extract). Thenantioxidant activity of the extract at 500 and 1,000 ppm was greatern(P u0002 0.05) than that of synthetic antioxidant, butylated hydroxyanisole onnboth accelerated oxidation and heating tests. Results of this study revealednhigh thermal stability of antioxidant components of drumstick extract and thenantioxidant potential of the extract in inhibiting lipid peroxidation of soybeannoil. Thus, the extract of drumstick leaves is recommended as an alternativensource of natural antioxidants.