Fragmentation of Angiotensin-I Converting Enzyme Inhibitory Peptides from Bonito Meat Under Intestinal Digestion Conditions and their Characterization

Kinetics of fragmentation of angiotensin-I converting enzyme inhibitory peptides obtained by digestion in gastric juice were studied under intestinal digestion conditions and their inhibitory activities were determined. A fragment IKYGD produced by digestion, as well as IKWGD synthesized, showed similar inhibitory activity to the original peptides. These peptides somehow were resistant to tryptic and/or chymotryptic digestion, and IK + aromatic amino acid might be important functional parts in some kinds of ACE inhibitory peptides.