Aktivitas Antioksidan Hidrolisat Kolagen Kulit Ikan Nila (Oreochromis niloticus)
Deny Tri Prastyo, Wini Trilaksani, Nurjanah Nurjanah
Abstract
Tilapia skin is a by-product of fish processing which can be used as an alternative raw material for collagen and its hydrolyzate. Collagen hydrolyzate is known to have potential biological activities including antioxidants. This study aims to examine the antioxidant activity of collagen hydrolyzate from the skin of tilapia (Oreochromis niloticus) in vitro. This research was divided into three stages including collagen pretratment, collagen extraction and collagen hydrolysis. In the hydrolysis process papain enzymes are used with different concentrations (4,000 U/g, 6,000 U/g, 8,000 U/g samples) with hydrolysis time for 60, 120 and 180 minutes. The average yield value of tilapia skin collagen hydrolyzate was 15.17%. The hydrolysis time, the concentration of enzymes given and the interaction between the two factors significantly affected the value of the degree of hydrolysis and antioxidant activity of the hydrolyzed collagen of tilapia skin. Collagen hydrolyzed for 120 minutes by giving an enzyme concentration of 8,000 U had an average percentage of degree of hydrolysis of 33.94%, and the best IC50 value was 93.32 µg/mL, categorized as strong antioxidant compounds. The zeta potential value of the tilapia skin collagen hydrolyzate was -10.9 mV.