The antioxidant activities of different polar solvent extracts of Polygonum multiflorum were studied and the correlation between activity and polyphenol content was investigated.Method: The polyphenols from Polygonum capitatum were extracted by macroporous resin,and the samples were extracted with different polar organic solvents.The samples were divided into petroleum ether phase,chloroform phase,ethyl acetate phase,n-butanol phase,aqueous phase with different polar solvent extracts.The total polyphenol co...