Authors : K. CHAVAN AND V. YARDI
Page Nos : 232-235
Description :
Fats and oils undergo deterioration during storage may be because of their natural structure and other external factors. Due to destruction of natural antioxidant during processing of oil; synthetic antioxidants are added in it, but, its permissible limit is 200ppm as high concentrations are reported to be carcinogenic. Peel is produced as a waste product after recovery of fruit juices. Citrus peels possess antioxidant activity and hence, in the present study, the efficacy of Citrus sinensis peel extract (CPE) as natural antioxidant in Sunflower oil was evaluated. CPE was prepared with methanol, ethanol and ethyl acetate and the best solvent was selected on the basis of yield. The antioxidant effectiveness of CPE was evaluated using Sunflower oil as an oxidative substrate. The oil sample containing Methanolic CPE (1500ppm, 2000ppm and 2500ppm), 150ppm of TBHQ (Tertiary Butyl Hydroxyquinone) and control (without antioxidant) were subjected to accelerated storage (60°C in electric hot air oven, 8hrs heating cycles per day) for the period of 60 days and analyzed after 10 days for the extent of oxidative changes by measurement of peroxide value (PV) and free fatty acid (FFA) value. The results obtained revealed that the oil containing 2000ppm and 2500ppm CPE showed lower PV than oil containing TBHQ. Hence, it can be said that the CPE (2000ppm and 2500ppm) can be used as natural antioxidant in Sunflower oil. But, as the colour of the oil also gets affected, the 2000ppm CPE concentration can be used to obtain best results.Hence, it can be concluded that, Methanolic extract of Citrus sinensis peel possess antioxidant activity(p<0.01) and best results could be achieved using the CPE concentration of 2000ppm and it could be a waste utilization also.
Keywords : antioxidants, CPE, Peroxide value, Free fatty acid value.
