Table 2.
Effect of some metal ions on the mannanase activity from B. pumilus (M27)
| Chemical compounds | Concentration (mM) | Relative activity (%) | Concentration (mM) | Relative activity (%) |
|---|---|---|---|---|
| None | – | 100 ± 0.0 | – | 100 ± 0.0 |
| Ca2+ | 1 | 140.0 ± 0.1 | 5 | 140.2 ± 0.6 |
| Mn2+ | 1 | 288.6 ± 1.3 | 5 | 328.7 ± 1.01 |
| Co2+ | 1 | 130.4 ± 0.5 | 5 | 218.6 ± 0.2 |
| Zn2+ | 1 | 272.2 ± 2.3 | 5 | 315.7 ± 2.4 |
| Cu2+ | 1 | 100.2 ± 0.2 | 5 | 228.2 ± 0.6 |
| Fe2+ | 1 | 343.2 ± 1.6 | 5 | 344.1 ± 0.3 |
| Ni2+ | 1 | 100.2 ± 2.0 | 5 | 123.7 ± 1.8 |
Each value represents the mean of 3 replicates experiments ± standard deviation