The objectives of this study were to separate angiotensin converting enzyme(ACE) inhibitory peptides from casein hydrolysate produced by sequential hydrolysis of casein with pepsin followed by trypsin and to analyze their amino acid sequences. The hydrolysate was concentrated by ultrafiltration and separated by Sephadex G-15 column chromatography into three components. Components Ⅱ and Ⅲ, which had higher inhibitory effect on ACE activity, were collected. Ion chromatography was used to analyze amino acid co...