Abstract
Abstract Collagen, in a form suitable for human consumption, can be obtained from the large amounts of fish skin via protein hydrolysis to produce low-molecular-weight substances with enhanced bioavailability and function. To optimize this method, we investigated the synergistic effect of elevated temperature (150–250 °C) and pressure (350–3900 kPa) of a hydrothermal process on the hydrolytic ability and characteristics of collagen hydrolysates. Elevated temperature and pressure of the hydrothermal process increased the levels of free amino groups and lower-molecular-weight collagen hydrolysates, particularly at 210 °C and 2100 kPa. The resulting hydrolysates were fractionated by ultrafiltration membranes of different molecular weight cutoff and evaluated for their antioxidant (ABTS radical scavenging activity and reducing power) and anti-aging (tyrosinase and collagenase inhibition) activities. The
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