Bulletin of the National Research Centre

Table 3 Effect of metal ion concentration on ginger PGII

From: Purification and characterization of cationic peroxidase from ginger (Zingiber officinale)

Metals	% Relative activity (2 mM)	% Relative activity (5 mM)
Non	100 ± 3.2	100 ± 3.4
Ba²⁺	130 ± 3.8	180 ± 4.8
Ca²⁺	120 ± 4.2	150 ± 5.2
Zn²⁺	110 ± 2.8	130 ± 3.3
Mg²⁺	145 ± 4. 3	170 ± 4.5
Mn²⁺	125 ± 3.4	145 ± 3.5
Ni²⁺	130 ± 4.0	145 ± 3.8
Co²⁺	110 ± 2.7	130 ± 2.9
Fe²⁺	155 ± 4.4	215 ± 5.8
Hg²⁺	65 ± 1.5	45 ± 1.7
Cu²⁺	22 ± 0.6	18 ± 0.7

Enzyme was preincubated for 15 min at 37 °C with 2 and 5 mM of listed ions as a final concentration prior to substrate addition. The values are presented as mean ± S.E. (n = 3)

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