| To study the antixidant effects of three natural antioxidants on double low rapeseed oil, 0.2 g/kg of vitamin E, ascorbyl palmitate and tea polyphenol palmitate were respectively added in double low rapeseed oil, by Schaal oven method for 13 d storage and the change in acid value, iodine value, thiobarbituric acid value, peroxide value and anisidine value during storage were determined. The results showed that the acid value, thiobarbituric acid value, anisidine value and peroxide value of double low rapeseed oil added with antioxidant increased to varying degrees during storage, but they were lower than that of double low rapeseed oil with no antioxidant(control), and the ascorbyl palmitate group had a lower rate of increase than tea polyphenol palmitate group and vitamin E group, and its peroxide value(0.23 g/100 g) did not exceed the national standard (0.25 g/100 g) after 13 d storage. In addition, during the 13 d storage period, the iodine value of the double low rapeseed oil added with tea polyphenol palmitate, ascorbyl palmitate and vitamin E respectively decreased by 69.34%, 5500% and 73.02% respectively, lower than that of the control (75.83%). Comprehensively, ascorbyl palmitate had the best inhibitory effect on oxidation of double low rapeseed oil. |
