| 摘要 |
PROBLEM TO BE SOLVED: To obtain a peptide-containing food having a hypotensor action by formulating an oligopeptide obtained by hydrolyzing a dried bonito with an enzyme. SOLUTION: This peptide-containing food contains an oligopeptide obtained by hydrolyzing a dried bonito with an enzyme. Preferably, thermolysin derived from a microorganism is used as the enzyme. When thermolysin is used, a product containing 0.1-0.3 wt.% of Leu-Lys-Pro-Asn-Met (Leu is leucine; Lys is Lysine; Pro is proline; Asn is asparagine; Met is methionine) as an oligopeptide having an excellent angiotensin transferase inhibiting effect is obtained. Preferably, hydrolysis is performed by using an enzyme in an amount of 0.1-1 wt.% based on the total of the dried bonito and water so as to a final hydrolysis fraction be 5-30% at 30-60 deg.C and pH 4-8 for 3-20 hrs. Preferably, the most exceeding effect is exhibited when tea is used as the food. Preferably, an oligopeptide may be formulated with the tea at a weight ratio of (oligopeptide/tea) is (70/30)-(55/45).
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