Table 3.

Effects of metal ions on the milk-clotting activity of the camel recombinant chymosin.

Metal ion	Concentration, mM	Relative activity, % (±st.d.)
Control	-	100 ± 3.95
Ca2+ (CaCl2)	10 mM	298.8 ± 16.04
Co2+ (CoCl2)	10 mM	182.7 ± 8.21
Ni2+ (NiCl2)	10 mM	19.9 ± 0.39
Fe2+ (FeCl2)	10 mM	338.7 ± 12.99
Ba2+ (BaCl2)	10 mM	373.5 ± 20.06
Zn2+ (ZnCl2)	10 mM	98.5 ± 4.54
Mg2+ (MgCl2)	10 mM	188.2 ± 5.31
Mn2+ (MnCl2)	10 mM	518.4 ± 19.02
Li1+ (LiCl)	10 mM	102.8 ± 2.73
K1+ (KCl)	10 mM	97 ± 4.61
Na1+ (NaCl)	10 mM	105 ± 4.06