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. 2014 Apr 1;14:119. doi: 10.1186/1472-6882-14-119

Table 4.

Effect of metal cations on miswak α-amylases

Metal Relative activity %
A1 A4a A4b A5a A5b
Ni2+
 43
 205
 131
 103
 40
Ca2+
 108
 152
 141
 110
 195
Co2+
 17
 242
 139
 111
 98
Zn2+
 18
 217
 42
 112
 27
Cu2+
 34
 114
 103
 65
 85
Pb2+
 86
 90
 99
 85
 82
Hg2+ 1 5 2 2 2