Peptides that inhibit angiotensin-converting enzyme (ACE) were isolated from tx-zein hydrolysate prepared with thermolysin.Their chemical structures were identified by Edman degradation and fast-atom bombardmentmass spectrometry.Mostof them were found to be tripeptides such as Leu-Arg-Pro, Leu-Ser-Pro, and Leu-Gin-Pro, having IC50 values of 0.27, 1.7, and 1.9/im,
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Miyoshi et al. (1991) studied this question.