Identification of bioactive peptides from brewers’ spent grain and contribution of Leu/Ile to bioactive potency

Brewer's spent grain (BSG) is a co-product of the brewing industry and is a potentially rich source of bioactive peptides. A BSG protein hydrolysate, manufactured at a semi-pilot scale, mediated significant hypotensive effects 6 h after ingestion in spontaneously hypertensive rats. This hydroly...

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Bibliographic Details
Published in:Journal of Functional Foods
Main Authors: Maria Cermeño, Alan Connolly, Martina B. O'Keeffe, Cal Flynn, Adeola M. Alashi, Rotimi E. Aluko, Richard J. FitzGerald
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier 2019
Subjects:
Brewers spent grain
Hypotensive
Antioxidant
Peptide
ACE
DPP-IV
Nutrition. Foods and food supply
TX341-641
IPY
Online Access:https://doi.org/10.1016/j.jff.2019.103455
https://doaj.org/article/71838990c9e643e28c652311fda61fe0
Description
Summary:Brewer's spent grain (BSG) is a co-product of the brewing industry and is a potentially rich source of bioactive peptides. A BSG protein hydrolysate, manufactured at a semi-pilot scale, mediated significant hypotensive effects 6 h after ingestion in spontaneously hypertensive rats. This hydrolysate was fractionated and further analysed by UPLC-ESI-MS/MS for peptide identification. The peptides, IPY and LPY demonstrated the highest antioxidant activity (0.37 ± 0.02 and 0.34 ± 0.02 µmol Trolox equivalents µM peptide−1, respectively), IPLQP and LPLQP had the highest ACE inhibitory activity (IC50: 3.10 ± 0.60 and 3.17 ± 0.60 µM, respectively) while IPVP had the highest DPP-IV inhibitory activity (IC50: 38.67 ± 5.94 µM). Overall, peptides containing I had higher in vitro bioactivities when compared to peptides having L. Novel BSG peptides were identified with potential for application as naturally derived ingredients for the management of cardiovascular disease and type 2 diabetes.

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