The extraction condition of polyphenol from Lotus rhizome peel was optimized by orthogonal experiment,and the an riodant acitivity was investigated by measuring its inhibitory effect on peroxide value(POV) of oil.The results show that the opti mum conditions area as follows :L.rhizome (1g)extracted with 10 mL of 60％ ethanol at 80℃ water bath extract 2.5h,repeated extraction twice.Under this optimum extraction condition,the yield and purity of polyhenols are 2.374％ and 52.99％ respec tively.The L.rhizome peel extracts possess significant inhibitory effect on POV of oil.Thus,the oil storagge period was extended.
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