Table 2.
Box-Behnken experimental design factors and their levels.
| Factor | Low Level (−1) | Medium level (0) | High level (+1) |
|---|---|---|---|
| Time (min) | 15 | 47.5 | 80 |
| Feed ratio | 5 | 12.5 | 20 |
| Amplitude (%) | 50 | 75 | 100 |
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