Table 2. Effects of metal ions and chemical compounds on xylanolytic enzyme activity.
| Metal ions and chemical compounds | Relative activity of xylanolytic enzyme (%)a | |
| 1 mM | 10 mM | |
| Control | 100.000 | 100.000 |
| Li+ | 97.813 | 105.243 |
| Na+ | 97.998 | 101.221 |
| K+ | 104.097 | 101.676 |
| Ca2+ | 105.752 | 100.485 |
| Mg2+ | 101.174 | 130.262 |
| Cu2+ | 98.324 | 45.751 |
| Zn2+ | 98.696 | 91.729 |
| Ni2+ | 96.774 | 92.818 |
| Fe3+ | 99.187 | 94.227 |
| Cr3+ | 109.497 | 108.752 |
| Co2+ | 124.776 | 154.135 |
| Al3+ | 100.010 | 111.729 |
| Ba2+ | 100.004 | 100.903 |
| EDTA | 8.241 | 2.779 |
| SDS | 5.692 | 1.566 |
a
The data represent the mean to untreated control samples from triplicate measurements (SD ≤5%).