Abstract
Fish discards are of major concern in new EU policies. Alternatives for the management of the new biomass that has to be landed is compulsory. The production of bioactive compounds from fish protein hydrolysates (FPH) has been explored in recent years. However, the viability of Scyliorhinus canicula discards, which might account for up to 90–100% of captures in mixed trawler, gillnet, and longline industrial fisheries, to produce FPH from the muscle with bioactivities has still not been studied in terms of the optimization of the experimental conditions to enhance its production. The effect of pH and temperature on the hydrolysis of the S. canicula muscle was mediated by three commercial proteases using response surface methodology. Temperatures of 64.6 °C and 60.8 °C and pHs of 9.40 and 8.90 were established as the best hydrolysis conditions for Alcalase and Esperase, respectively. Optimization of the best conditions for the maximization of antihypertensive and antioxidant activities was performed. Higher Angiotensin-converting enzyme (ACE) activity was found with Esperase. The pH optimum and temperature optimum for antioxidants were 55 °C/pH8.0 for ABTS/DPPH-Esperase, 63.1 °C/pH9.0 for DPPH-Alcalase, and 55 °C/pH9.0 for ABTS-Alcalase. No hydrolysis was detected when using Protamex.
Highlights
Fishery Policy, along with new guidelines to reduce the wasteful practice of discarding by the introduction of a landing obligation (Regulation EU N◦ 1380/2013)
The effect of pH and temperature on the hydrolysis of the S. canicula muscle was mediated by three commercial proteases using response surface methodology
The corresponding muscle from S. canicula discards that cannot be used for human consumption may be a valuable substrate for the production of fish protein hydrolysates (FPH) and bioactive peptides
Summary
Fishery Policy, along with new guidelines to reduce the wasteful practice of discarding by the introduction of a landing obligation (Regulation EU N◦ 1380/2013). Mar. Drugs 2017, 15, 306 alternatives for the management of the new biomass that should be landed is compulsory. Drugs 2017, 15, 306 alternatives for the management of the new biomass that should be landed is compulsory Such an approach is consistent with the Blue Growth initiative of European Horizon 2020, which aims to ensure and support the sustainable growth of natural marine resources. The success of this blue strategy depends on the development of a blue technology focused on the exploration of bioactive compounds obtained from marine organisms including discards and by-products with potential interest in the food/feed/pharmaceutical/cosmetical industries
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