Abstract: The radical scavenging capacity of polyphenolic compounds from Prunus humilis Bge fruit was studied by three different antioxidant tests system such as soybean phosphatidylcholine liposome model system,LDL media and bovine serum album media.The correlation between the total phenols and antioxidant capacities assayed by the three methods is high,and polyphenol in Prunus humilis Bge fruit is found to inhibit the lipid peroxidation and protein oxidation in a close-dependent and a time course manner.There is a complete inhibition of conjugate diene(CD)formation induced by proxyl radicals and Cu2+ at the early stages.In inhibition study of lipid peroxide,lag phase was increased.Peroxidation of BSA induced by proxyl radical is also efficiently scavenged.Free radical scavenging activities present polyphenols from Prunus humilis Bge fruit to be effective antioxidants to protect against oxidative damage of biofilm,lipoprotein and serum protein induced by free radicals.These results indicated that polyphenol in Prunus humilis Bge fruit has potential application value.

Key words: Prunus humilis Bge, free radical scavengers, antioxidant activity, polyphenolic compounds