abDifferent lowercase letters indicate significant differences (P<0.05) betweensamples. a is the hydrolysate by alcalase after 1 hour hydrolysis; a is the hydrolysate by alcalase after 2 hours; a is the hydrolysate by thermolysin after 1 hour; a is the hydrolysate after 2 hours; a is the hydrolysate by alcalase with 10 kDa molecular weight (MW) cut-off; b is the hydrolysate by alcalase with 3 kDa MW cut-off; b is the hydrolysate by thermolysin with 10 kDa MW cut-off; b is the hydrolysate with 3 kDa MW cut-off.

Figure 1: Effect of hydrolysis time and different enzymes on antioxidative activity of O. niloticus protein hydrolysate with reducing power assay; (b) Antioxidative activity on low molecular weight of O. niloticus protein hydrolysate after one hour hydrolysis with reducing power assay (n=3).