LAUSR

Bioactive peptides have been investigated largely for many biofunctional properties. The aim of this research was to determine the inhibitory activity of ultrafiltration (UF) and gel filtration (GF) fractions of gelatin derived from bone of Pangasius catfish against dipeptidyl peptidase IV (DPP-IV). Previous studies have shown that gelatin from skins of salmon, hake, halibut, milkfish, tilapia and bone of pangasius catfish have the activity in DPP-IV inhibition. While, as inhibitor, most of previous and recent studies shown that separation and fractination of gelatin hydrolysate increase their activity. This research was conducted in three stages including gelatin hydrolysates fractination by ultrafiltration (UF), UF fraction loaded into gel filtration (GF) and DPP-IV inhibition measurement. The fish bone gelatin was hydrolyzed using flavourzyme at three enzyme/substrate ratios (E/S of 3%, 6% and 9%) with incubation times 4, 6, and 8 h. Then, the hydrolysates fractioned by ultrafiltration with 3 kDa cutoff membrane continued with Superfine G-25 sephadex column (65 cm x 3 cm, flow rate 1 mL/min). The result shown that both group of fractions i.e UF and GF have inhibitory activity regarding their capacity to inhibit DPP-IV.  The UF fraction >3 kDa derived from 9% (E/S) ratio for hdyrolysis were superb as DPP-IV inhibitor than other fractions, the highest one also has bioactivity higher than other previous fish gelatin fractions.