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Factors and levels in the fractional factorial design.
| Factors |
Level of factors (g/L) | ||
|---|---|---|---|
| –1 | 0 | +1 | |
| Carbon source (x1) | 50.0 | 70.0 | 90.0 |
| (NH4)2SO4 (x2) | 3.0 | 8.0 | 13.0 |
| K2HPO4 (x3) | 0.0 | 0.5 | 1.0 |
| MgSO4 (x4) | 1.0 | 2.0 | 3.0 |
| Tween-80 (x5) | 1.0 | 2.0 | 3.0 |
| Initial pH (x6) | 7.5 | 8.5 | 9.5 |
