Abstract
Peptidic fractions which inhibit angiotensin I-converting enzyme (ACE) were separated from peptic digests of soybean by ion exchange chromatography and gel filtration. Further separation of the peptidic fractions by ODS HPLC afforded active peptides, the amino add sequences of which were identified by Edman's procedure as: Ile-Ata (inhibitory against ACE with an IC50of 153 μM), Tyr-Leu-Ala-Gly-Asn-Gln (14 μM), Phe-Phe-Leu (37 μM), Ile-Tyr-Leu-Leu (42 μM), and Val-Met-Asp-Lys-Pro-Gln-Gly (39 μM). The antihypertensive activity of the soybean peptides was also investigated. Peptide fractions (2.0 g/kg body weight, oral administration) markedly towered the blood pressure of spontaneously hypertensive rats (SHRs).
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