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.
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Acknowledgments
The Australian Research Council (ARC) linkage grant (LP0991005), Geelong Food Co-Product Cluster (GFCC)/Ambaco P/L (North Geelong, Victoria, Australia) as an industry partner and the College of Health and Biomedicine, Victoria University (Melbourne, Australia) are all greatly acknowledged by the authors. Dr. Ian Knuckey, Director of Fishwell Consultings (Queenscliff, Victoria, Australia) and Mr. Kon Tsoumanis, Managing Director of Barwon Foods, North Geelong, Victoria, Australia) are also thankful for their support and fish sample provisions from Barwon foods.
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Manikkam, V., Mathai, M.L., Street, W.A. et al. Sustainable use of silver warehou (Seriollela punctata): effects of storage, processing conditions and simulated gastrointestinal digestion on selected in-vitro bioactivities. J Food Sci Technol 53, 3574–3582 (2016). https://doi.org/10.1007/s13197-016-2338-1
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DOI: https://doi.org/10.1007/s13197-016-2338-1