STUDY ON SCAVENGING ACTIVITY OF FREE RADICALS BY CORN SILK FLAVONOIDS

The scavenging activity of free radicals of flavonoids from corn silk were studied and compared with lutin's by used the assay of DPPH,H2O2/Fe2+ for hydroxyl radical system and superoxide anion radical system.The results showed that the scavenging on DPPH was as fellows:crude extract crude extract for n-Butanol crude extract for Ethyl acetate,when the concentration of sample were 1,2 g/L and 2 g/L,the rate of scavenging were 93 %,71 % and 78 % respectively.The scavenging on hydroxyl radical was as fellows:crude extract crude extract for Ethyl acetate crude extract for n-Butanol,when the concentration of sample were 2 g/L,the highest scavenging were reached with 92.04 %,82.6% and 56.5% respectively.The scavenging on superoxide anion radical was as fellows:crude extract crude extract for Ethyl acetate crude extract for n-Butanol,when the concentration of sample were 20 g/L,the highest scavenging were reached with 94.8 %,58 % and 92.04 % respectively.The scavenging activity of sample on free radicals were higher than that of lutin's.These results suggested that corn silk flavonoids have better capacity of the scavenging free radicals.