The resultant supernatants were analyzed by high-performance liquid chromatog raphy(HPLC) to identify and quanti the antioxidants. An HPLC system(LC 20, Shimadzu) equipped with an auto sampler, 150 mm x 4.6 mm C18 column(Prodigy, Phenomenex), and photodiode array detector with the appropriate mo bile phase for phenolic compounds and carotenoids was used