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Levels of the factors tested in the Plackett-Burman design
| Factor | Code level | ||
|---|---|---|---|
| −1 | 0 | +1 | |
| A-Dextrose (g/l) | 20 | 25 | 30 |
| B-Peptone (g/l) | 5 | 7.5 | 10 |
| C-Initial pH | 5 | 7 | 9 |
| D-Temperature (°C) | 25 | 30 | 35 |
| E-NaCl (g/l) | 1 | 3 | 5 |
| F-Fermentation time (days) | 10 | 12.5 | 15 |
| G- MgSO4.7H2O (g/l) | 0.1 | 0.3 | 0.5 |
