Patent ID: 7034002

Claim:
A food comprising an angiotensin converting enzyme inhibitor containing a mixture of an oligopeptide having angiotensin converting enzyme inhibitory activity and polypeptides, said mixture being obtained by the steps of: digesting a fish meat with thermolysin enzyme to produce a hydrolyzate, and treating the hydrolyzate with membrane or by solvent extraction with a polar organic solvent to reduce the content of polypeptides having a molecular weight of at least 5000 to 0.1 to 10% by weight of the total hydrolyzate in the mixture; and said oligopeptide having angiotensin converting enzyme inhibitory activity is at least one selected from the group consisting of Ile-Tyr-(SEQ. ID. NO. 2), Phe-Gln-Pro (SEQ. ID. NO. 3), Ile-Leu-Tyr (SEQ. ID. NO. 4), Ile-Tyr-Ala (SEQ. ID. NO. 5), Ile-Lys-Trp (SEQ. ID. NO. 6), Leu-Lys-Tyr-Pro (SEQ. ID. NO. 7), Ile-Val-Arg-Asp (SEQ. ID. NO. 8), Leu-Lys-Pro-Asn-Met (SEQ. ID. NO. 9), Ile-Trp-His-His-Thr (SEQ. ID. NO. 10), Ala-Leu-Pro-His-Ala (SEQ. ID. NO. 11), Ile-Lys-Pro-Leu-Asn-Tyr (SEQ. ID. NO. 12), Asp-Tyr-Gly-Leu-Tyr-Pro (SEQ. ID. NO. 13), and Ile-Val-Gly-Arg-Pro-Arg-His-Gln-Gly (SEQ. ID. NO. 14).