Table 1.
Process parameters selected for optimization: fermentation temperature and time.
| Parameters | Code | High level (+1) | Medium level (0) | Low level (−1) |
|---|---|---|---|---|
| Temperature (°C) | X1 | 20 | 15 | 10 |
| Time (h) | X2 | 336 | 252 | 168 |
h – hour.
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