Analysis of Antioxidant Properties of High-Sterol Rapeseed Oil by EPR Spectroscopy
The formation of free radicals is the reason for the self oxidation of rapeseed oil,and sterols can eliminate free radicals,thus possessing antioxidant properties.Spin trapping agents capture transient free radicals in rapeseed oil,and the content of captured free radicals in the rapeseed oil system is determined by electron paramagnetic resonance spectroscopy.The oxidation of rapeseed oil with low and high sterol contents is obtained at different temperatures,storage containers,and UV irradiation time.There is no significant difference in the intensity of free radicals and peroxidation values under the influence of temperature and storage containers(P＜0.05).High sterol rapeseed oil has a significant antioxidant effect.After 7 days of oxidation,the POV values of high sterol rapeseed oil at 20,40 and 60 ℃ decrease by 0.04,0.14 and 0.34 g/100 g,respectively,compare to ordinary rapeseed oil;The POV values of high sterol rapeseed oil in metal,glass,and plastic containers are reduced by 0.20,0.14 and 0.14 g/100 g,respectively,compare to ordinary rapeseed oil;The energy of ultraviolet lamps destroys sterols,causing them to lose their antioxidant capacity.
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