A novel anticancer peptide was purified from Crassostrea gigas and investigated for its cytotoxic activity. To prepare the peptide, eight proteases were employed for enzymatic hydrolysis. Flavourzyme hydrolysate, which showed clearly superior cytotoxic activity on prostate cancer cells, was further purified using a membrane system and consecutive chromatographic methods. Finally, a novel anticancer peptide was obtained, and the sequence was partially purified as His-Phe-Asn-Ile-Gly-Asn-Arg-Cys-Leu-Cys at the N-terminus. The peptide purified from C. gigas effectively induced the death of prostate, breast, and lung cancer cells but not normal liver cells. This is the first report of an anticancer peptide derived from the enzymatic hydrolysates of C. gigas.
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