The antioxidative effect of methanol and water orange peel extracts on Refined Palm Kernel Oil (RPKO) stored for twelve months at room temperature (27 0 C-33 0 C) was determined by monitoring the colour, refractive index, free fatty acid (FFA), acid value (AV) and peroxide value (PV). The oil was dosed with different concentrations (200 ppm to 1000 ppm) of the extracts and butylatedhydroxytoluene (BHT) (Cone. 200 ppm. The colour and refractive index of RPKO containing the extracts ranged between 11.0-13.0 units and 1.458-1.460 respectively whereas the colour and refractive index of RPKO with no additive (0 ppm) and 200 ppm BHT were 10.0 units and 1.460 accordingly. Free fathy acid (FFA) and acid value (AV) of RPKO containing methanol and water orange peel extracts were lower than RPKO containing 200 ppm BHT and they were significantly different at P<0.05 from RPKO that contained no additive (0 ppm). PV of RPKO containing additives were slightly lower than PV of RPKO that contained no additive but they were not significantly different at P<0.05.The methanol and water orange peel extracts are more effective in combating hydrolytic rancidity than oxidative rancidity of RPKO. The methanol and water orange peel extracts have better antioxidant activity than butylatedhydroxytoluene
The antioxidative effects of methanol orange peel extract (MOPE) and butylatedhydroxytoluene (BHT) on stability of crude peanut oil (CPO) stored for twelve months in white transparent plastic bottles at room temperature (27-33 1C) were investigated. Extract of orange peel was prepared by dissolving 20 g of dried, ground and sieved sweet orange peel into 200 ml of methanol for three days. The methanol orange peel extract (MOPE) was added at varying concentrations (200-1000 ppm) to CPO. Another set of CPO which contained 200 ppm BHT as well as CPO that contained no additive was also set up. The colour and refractive indices of oil samples were immediately determined while free fatty acid (FFA), acid value (AV) and peroxide value (PV) of CPO samples were determined monthly using standard methods. The colour of CPO containing additives (MOPE and BHT) and that which contained no additive (0 ppm) was 30.0 units in 1/2 00 cell. The refractive index of CPO containing varying concentrations of MOPE ranged between 1.464 and 1.465 while CPO containing no additive (0 ppm) and 200 ppm BHT was 1.463. There was no significant difference at Po 0.05 in FFA, AV and PV of CPO containing MOPE, BHT and CPO containing no additive. The FFA, AV and PV of CPO containing additive (MOPE and BHT) were lower than that of CPO containing no additive. BHT was better in stabilizing hydrolytic rancidity of CPO while MOPE was superior to BHT in stabilizing CPO against oxidative rancidity. & 2015 The Authors. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Crude oil was extracted from Adenopus breviflorus benth seeds using n-hexane and the extracted oil was degummed, neutralized and bleached. Oil sample at each stage was assessed for physicochemical parameters and fatty acid composition. − 59.774%) followed by oleic acid (11.099 − 12.766%) while the least fatty acid was lauric acid (0.053 − 0.355%).
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