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Inhibition of angiotensin-converting enzyme I (ACE-I) in vitro and in vivo from peptide fractions by enzymatic hydrolysis of the Vigna unguiculata protein concentrate was evaluated. Hydrolysis was done with Pepsin-Pancreatin and Flavourzima in two separate systems. The resulting hidrolysates were ultrafiltrated to obtain fractions with different molecular weight. The fractions with better inhibition Flavourzima were size > 1 kDa (> 1 kDa-F) and < 1 kDa (< 1 kDa-F), with an IC50 of 1222.84 and 1098.6 μg/ml respectively. Pepsin-Pancreatin fraction. [ABSTRACT FROM AUTHOR]