The crude proteins of green tea were extracted by saturated ammonium sulfate precipitation from dry green tea in this experiment,and the dialyzed crude proteins were purified further by dextran gel Sephadex G-75 column.The purity and relative molecular weight of the purified samples were determined by SDS- PAGE method.The scavenging capacity to ·OH and O-2· free radical were also examined in order to investigate antioxidant activity of the antioxidant peptide.The results showed that the antioxidant peptide ...