عنوان مقاله [English]
نویسندگان [English]چکیده [English]
The in-vitro effects of biochemical factors on trypsin activity from intestine and pyloric
caeca of common kilka (Clupeonella cultriventris caspia) was evaluated. Trypsin is known to
cause belly bursting in common kilka. The assessments showed that in a range of 4-70Â°C,
trypsin from pyloric caeca and intestine of common kilka had the maximum activity and the
satiability at 60 and 55Â°C, respectively. The pH assessments indicated that maximum activity
and stability for trypsin were at 8.5 at pH range of 4-11. The effects of metal ions on trypsin
activity revealed that CaCl2, MgCl2 and MnCl2 increased trypsin activity while CuCl2 ØZnCl2
and Al2(SO4)3 decreased its activity. The effect of inhibitors on trypsin activity also showed
that SBTI and TLCK (specific inhibitors for trypsin) significantly inhibited trypsin activity.
This study suggests that belly bursting in common kilka can be prevented by trypsin
inactivation through application of low temperature (4Â°C), acidic pH, metals of CuCl2, ZnCl2
and Al2(SO4)3 and inhibitors of SBTI and TLCK.