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Factors and levels of central composite design for carbon sources and inorganic salts.
| Symbol | Variables | Code level | ||||
|---|---|---|---|---|---|---|
| −1.6818 | −1 | 0 | 1 | 1.6818 | ||
| X 1 | Sucrose (g/L) | 3.1821 | 10 | 20 | 30 | 36.8179 |
| X 4 | K2HPO4 ·3H2O (g/L) | 0.1591 | 0.5 | 1 | 1.5 | 1.8409 |
| X 6 | MgSO4 ·7H2O (g/L) | 0.1591 | 0.5 | 1 | 1.5 | 1.8409 |
