title: Sustainable use of silver warehou (Seriollela punctata): effects of storage, processing conditions and simulated gastrointestinal digestion on selected in-vitro bioactivities.
abstract: Australian underutilised fish species may serve as a potential source of valuable proteins and potent bioactive peptides. This novel research is the first to investigate the effects of storage-processing conditions and an in-vitro simulated gastrointestinal digestion (pepsin-pancreatin) on bioactive peptides' release during storage of fish fillet, derived from Australian silver warehou (Seriolella punctata). In-vitro bioactivities including angiotensin-converting enzyme and trypsin inhibitory and antioxidant activities were analysed. The antioxidant power was evaluated by DPPH free radical scavenging activity, Cu2+chelating and Fe3+reducing abilities. Fillets were stored at chilled (4 and 6 °C) and freezing (-18 °C) temperatures for 7 and 28 days, respectively. Results indicated that during postmortem storage, endogenous enzymes released from fillets an array of polypeptides during storage. The demonstrated physiological activities were further increased during simulated digestion. Bioactivities were greater at 4 °C, increasing over 7 days as compared to at 6 and -18 °C. An increase by 2 °C for chilled temperature was enough to cause significant changes in activities. The crude extracts obtained by pancreatin treatment demonstrated the highest metal chelating activities at 4 °C (86.3 ± 0.1 % on day 7). Physiological potency, especially metal chelating activity, of fillets obtained from silver warehou may be manipulated by storage conditions that would consequently be further enhanced during simulated digestion.
authors: Advanced Food Systems Research Unit, College of Health and Biomedicine, Victoria University, P.O. BOX 14428, Melbourne, VIC 8001 Australia.
authors: V
authors: V
authors: Manikkam
authors: Center for Chronic Diseases, College of Health and Biomedicine, Victoria University, P.O. BOX 14428, Melbourne, VIC 8001 Australia.
authors: M L
authors: ML
authors: Mathai
authors: Geelong Food Co-products Cluster, P.O. Box 842, Gisborne, VIC 3437 Australia.
authors: W A
authors: WA
authors: Street
authors: Advanced Food Systems Research Unit, College of Health and Biomedicine, Victoria University, P.O. BOX 14428, Melbourne, VIC 8001 Australia.
authors: O N
authors: ON
authors: Donkor
authors: Advanced Food Systems Research Unit, College of Health and Biomedicine, Victoria University, P.O. BOX 14428, Melbourne, VIC 8001 Australia.
authors: T
authors: 0000-0003-1395-7349
authors: T
authors: Vasiljevic
keywords: Bioactivity; By-catch; Digestion; Storage; Underutilized fish