In search of antioxidant peptides from porcine liver hydrolysates using analytical and peptidomic approach

The search for antioxidant peptides as health-promoting agents is of great scientific interest for their biotechnological applications. Thus, the main goal of this study was to identify antioxidant peptides from pork liver using alcalase, bromelain, flavourzyme, and papain enzymes. All liver hydrolysates proved to be of adequate quality regarding the ratio EAA/NEAA, particularly flavourzyme hydrolysates. The peptidomic profiles were significantly different for each enzyme and their characterizations were performed, resulting in forty-four differentially abundant peptides among the four treatments. Porcine liver hydrolysates from alcalase and bromelain are demonstrated to have the most antioxidant capacity. On the other hand, hydrophobic amino acid residues (serine, threonine, histidine and aspartic acid) might be reducing the hydrolysates antioxidant capacity. Seventeen peptides from collagen, albumin, globin domain-containing protein, cytochrome β, fructose-bisphosphate aldolase, dihydropyrimidinase, argininosuccinate synthase, and ATP synthase seem to be antioxidant. Further studies are necessary to isolate these peptides and test them in in vivo experiments.Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria | Ref. RTA 2017-00024- CO4-04Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria | Ref. CPD2016-0030Axencia Galega de Innovacion | Ref. IN607A2019/01Programa Iberoamericano de Ciencia y Tecnología para el Desarrollo | Ref. 119RT056