Table 1.
Factors and levels of Plackett–Burman design (PBD).
| Parameters | Level | |
|---|---|---|
| −1 | 1 | |
| X1 Time (h) | 40 | 50 |
| X2 Temperature (°C) | 30 | 37.5 |
| X3 Inoculum level (%) | 1 | 1.25 |
| X4 Shaker speed (rpm) | 120 | 150 |
| X5 pH | 6 | 7.5 |
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