Table 2. Effect of metal ions on the stability of purified CD2-MnP from Irpex lacteus CD2.
| Chemicals | Concentration (mM) | Relative enzyme activity(%) | |
| 12 h | 24 h | ||
| None | 100% | 100% | |
| CoCl2 | 0.40 | 101.48 | 96.96 |
| 4.00 | 102.92 | 98.98 | |
| CaCl2 | 0.40 | 101.90 | 101.29 |
| 4.00 | 101.81 | 102.04 | |
| CdCl2 | 0.40 | 97.05 | 94.16 |
| 4.00 | 107.24 | 100.57 | |
| MgCl2 | 0.40 | 104.00 | 102.22 |
| 4.00 | 106.04 | 105.43 | |
| AlCl3 | 0.40 | 103.27 | 101.75 |
| 4.00 | 107.34 | 108.14 | |
| NiCl2 | 0.40 | 99.26 | 100.23 |
| 4.00 | 96.78 | 96.83 | |
| LiCl | 0.40 | 107.80 | 99.30 |
| 4.00 | 103.72 | 95.14 | |
| ZnCl2 | 0.40 | 105.80 | 110.78 |
| 4.00 | 106.44 | 103.17 | |
| FeCl3 | 0.40 | 102.63 | 98.60 |
| 4.00 | 97.78 | 90.00 | |
The MnP activity of control without adding any metal compound was set as 100%.