Abstract:In vitro antioxidant activities of L-ascorbyl fatty acid esters were studied by the items of hydroxyl radical system,superoxide anion free radical system,system of DPPH·,and reducing power.Its antioxidant effects was further evaluated by adding into the lard and bead oil.The results indicated that L-ascorbyl fatty acid esters within the given concentration range in dose-effect relationship showed good antioxidant activities on both the clearance of hydroxyl radical,superoxide anion free radical and DPPH· and the reducing power.Furthermore,the antioxidant activities of L-ascorbyl fatty acid esters were comparable with that of L-ascorbyl palmitate.When 0.2%(w/w) of L-ascorbyl fatty acid esters were added in the lard for a 20 h forced oxidation at 100 ℃,the POV of lard was 42.8 meq/kg,which illustrated L-ascorbyl fatty acid esters had significant antioxidant activities.When 0.2%(w/w) of L-ascorbyl fatty acid esters were added in the soybean oil for a 14 h forced oxidation at 100 ℃,the POV of soybean oil was 11.9 meq/kg.The antioxidant ability of L-ascorbyl fatty acid esters for soybean oil was higher than that of TBHQ,but was close with that of L-ascorbyl palmitate.Thus,L-ascorbyl fatty acid esters were demonstrated to be potential food antioxidants.
