Table 1.
Value of pretreatment parameters with corresponding coded level.
| Pretreatment Factor | Level of Factor | ||
|---|---|---|---|
| Low | Med | High | |
| Abbreviation | −1 | 0 | 1 |
| Loading ratio (wt%) (X1) | 5 | 10 | 15 |
| Temperature (°C) (X2) | 100 | 120 | 140 |
| Time (min) (X3) | 30 | 60 | 90 |
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