Table 2.
Independent factors and their levels used in the response surface design
| Factors | Factor levels | ||
|---|---|---|---|
| Coded levels | −1 | 0 | 1 |
| X 1: enzyme dosage (mg g−1) | 10 | 15 | 20 |
| X 2: pH | 2 | 3 | 4 |
| X 3: extraction temperature (°C) | 40 | 45 | 50 |
| X 4: extraction time (h) | 1 | 2 | 3 |
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