Chemical

Relative activity (%)

1 mM concentration

Relative activity (%)

5 mM concentration

Control

100

100

EDTA

84

76

SDS

150

204

Urea

85

40

ZnCl2

28

44

MgCl2

51

72

NiCl2

47

24

CaCl2

56

80

HgCl2

20

0

CuCl2

96

83

Tween20

127

215