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Experimental codes and levels of independent variables in the Box–Behnken design for optimal β-glucosidase production by the Neofusicoccum parvum strain F7.
| Variables | Symbol code | Experimental values | ||
|---|---|---|---|---|
| Low (−) | Zero (0) | High (+ 1) | ||
| Incubation time (days) | X1 | 8 | 10 | 12 |
| Incubation temperature (°C) | X2 | 5 | 6 | 7 |
| Glycerol (carbon source) (%) | X3 | 0.25 | 0.5 | 0.75 |
