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

• 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

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.