Research of antioxidant activity of total flavonoids of corn silk

The total flavonoids was extracted from corn silk.The antioxidant activity of total flavonoids were evaluated by the following three method: the antioxidant activity of lard oil, the DPPH radical scavenging, reducing capacity for Fe3 +.The results indicated that total flavonoids had a slower oxidation than that not added corn total flavonoids in lard oil.The IC50 of DPPH radical scavenging from total flavonoids was 0.057 mg /mL, which was lower than BHT's IC50 ( 0.17mg/mL) .Under the same concentration, the Fe3 +reduction capacity of total flavonoids was stronger than BHT.Therefore, the total flavonoids had antioxidant effects, could be used as a natural antioxidant in the food sector.