Journal
JOURNAL OF FUNCTIONAL FOODS
Volume 20, Issue -, Pages 276-290Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jff.2015.10.025
Keywords
ACE-inhibitory peptides; Hypertension; Medicinal sea cucumber; Mode of inhibition; Isoelectric focusing technique; In vivo ACE inhibition assay
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Funding
- Ministry of Science, Technology and Innovation, Malaysia [10-05-31-FB037]
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Stichopus horrens is the most popular species of sea cucumber due to strong beliefs of its numerous medicinal properties. In this study, ACE-inhibitory peptides of S. horrens generated through enzymatic hydrolysis using Alcalase were isolated. Three peptides EVSQGRP, CRQNTLGHNTQTSIAQ and VSRHFASYAN were found to exhibit high inhibition potency with IC50 values of 0.05, 0.08 and 0.21 mM, respectively. It was found that the EVSQGRP, VSRHFASYAN and SAAVGSP exhibiting mixed inhibition patterns were susceptible to degradation by ACE as well, suggesting that the mixed-mode inhibition could be a result of new generated peptide fragments while CRQNTLGHNTQTSIAQ inhibited ACE in a non-competitive manner. In vivo ACE inhibition studies showed that 400 mg/kg of Alcalase-generated proteolysate stabilized the blood pressure in normotensive rats. These results suggest that the hydrolysed protein components of S. horrens possess bioactive peptides that can be exploited as functional food ingredients against hypertension. (C) 2015 Elsevier Ltd. All rights reserved.
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