Table 4: Effects of metal ions and EDTA on phytase activity.

Relative activity (%)
1 mM5 mM

K+101.5 ± 3.2104.9 ± 2.8
Ca2+107.6 ± 3.1114.8 ± 5.3
Mg2+102.7 ± 0.8103.5 ±3.5
Mn2+95.4 ± 5.169.6 ± 2.7
Zn2+90.2 ± 2.176.5 ± 1.6
Cu2+104.6 ± 2.582.8 ± 2.3
Fe3+96.9 ± 3.0100.2 ± 1.7
Al3+67.6 ± 1.332.5 ± 0.9
EDTA100.7 ± 2.8103.4 ± 2.3

The phytase activity in the absence of metal ions was regarded as 100%. Data are given as means ± SD, = 3.