Table 4.
Effect of metal ions and EDTA on C. comatus laccase activity.
| Metal ions | Residual activity (% of control) | |||
|---|---|---|---|---|
| 1.25 mM | 2.5 mM | 5 mM | 10 mM | |
| Al3+ | 89.1 | 88.5 | 85.4 | 84.3 |
| Ca2+ | 86.0 | 83.8 | 80.6 | 69.7 |
| Co2+ | 100 | 100 | 100.9 | 89.9 |
| Cu2+ | 98.0 | 100 | 110.8 | 110.4 |
| Fe2+ | 34.2 | 28.1 | 22.1 | 10.7 |
| Hg2+ | 82.3 | 71.2 | 61.8 | 45.5 |
| K+ | 98.0 | 106.4 | 97.8 | 91.0 |
| Li+ | 85.3 | 86.8 | 87.4 | 83.0 |
| Mg2+ | 99.7 | 100 | 86.8 | 80.9 |
| Mn2+ | 94.1 | 91.1 | 85.8 | 70.0 |
| Zn2+ | 100 | 98.9 | 90.0 | 88.0 |
| EDTA | 98.9 | 100 | 98.0 | 97.5 |
Laccase activity in the absence of metal ions was regarded as 100%.