Table 2: The effect of metal ions on phytase activity. Activity at pH 4.5 and 37°C without any metal ions was taken as 100%. The data are the means ± the standard deviations of at least three independent assays.
| Metal ions |
Relative activity (%) |
| AgpP-N |
AgpP-P |
| Control |
100 |
100 |
| Ca2+
|
230±16 |
220±15 |
| Mg2+
|
218±14 |
200±14 |
| Mn2+
|
215±14 |
200±14 |
| Co2+
|
100±7 |
98±7 |
| Fe2+
|
90±6 |
40±3 |
| Cu2+
|
84±5 |
45±3 |
| Zn2+
|
58±4 |
40±3 |