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The effect of metal divalent cations on crude amylase from the three isolates. Each value represents the mean of three independent assays.
| Metal ion | Concentration (mM) | Residual activity (%) | ||
|---|---|---|---|---|
| M13 | M8 | M2 | ||
| Ca | 1 | 91.1 | 91.6 | 90.4 |
| 5 | 93.3 | 106.3 | 110.2 | |
| 10 | 108.5 | 88.4 | 86.7 | |
|
| ||||
| Mg | 1 | 85.4 | 84.5 | 83.6 |
| 5 | 79.3 | 81.5 | 80.7 | |
| 10 | 76.9 | 78.3 | 77.6 | |
|
| ||||
| Zn | 1 | 48.3 | 50.2 | 48.5 |
| 5 | 19.5 | 20.7 | 24.6 | |
| 10 | 17.8 | 18.4 | 20.7 | |
|
| ||||
| None | 100 | 100 | 100 | |
