Metal ions

5 mM

10 mM

Residual activity (%)

Residual activity (%)

Control

100.0 ± 2.12

100.0 ± 2.12

K⁺

100.0 ± 2.45

100.0 ± 1.19

Ca²⁺

100.0 ± 2.01

112.88 ± 0.24

Zn²⁺

100.0 ± 1.13

111.36 ± 0.40

Mg²⁺

106.89 ± 1.89

116.39 ± 1.67

Na⁺

115.86 ± 1.90

114.98 ± 1.66

Fe²⁺

115.82 ± 1.86

93.95 ± 0.23

Hg²⁺

91.21 ± 1.27

77.31 ± 0.83

Cu²⁺

78.34 ± 0.65

66.02 ± 3.31