Table 2.

Effects of different metal salts and chemical additives on activity of NFAmy13A

Additives	Relative activity (%)
	1 mM	10 mM
α-Amylase (no additives)	100.0 ± 2.5	100.0 ± 1.1
CaCl2	98.1 ± 1.1	147.5 ± 5.1
AlCl3	96.4 ± 5.0	98.9 ± 5.1
BaCl2	94.3 ± 3.2	90.8 ± 2.7
CoCl2	64.6 ± 0.8	47.5 ± 3.9
FeCl3	93.2 ± 1.7	81.1 ± 5.9
CuCl2	95.0 ± 0.6	83.9 ± 0.0
KCl	97.7 ± 0.9	95.7 ± 0.5
MgSO4	95.5 ± 2.8	115.8 ± 3.2
ZnSO4	97.2 ± 0.4	90.9 ± 1.4
NiSO4	95.0 ± 2.6	84.2 ± 5.4
MnSO4	94.4 ± 2.0	92.3 ± 1.4
HgCl2	49.0 ± 4.4	2.2 ± 0.6
EDTA	97.8 ± 0.8	87.2 ± 3.9
SDS	80.0 ± 3.7	61.7 ± 6.7