The antioxidant abilities of two isoflavone antioxidants as genistein and daidzein are investigated by using density functional level of theory at B3LYP/ 6-311++G** basis set.The geometry structures,frontier molecular orbital energy gap and enthalpy of radical formation are analyzed to explore the key factors that influence the antioxidant activities of isoflavones.The main working mechanism of antioxidants is explored at the molecular level.The potentiality of antioxidant activity are highly related to the...