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Experimental ranges of four parameters used in the central composite design of response surface methodology (RSM).
| Code Value | Independent Variables | Range Coding Level | ||
|---|---|---|---|---|
| −1 | 0 | +1 | ||
| A(X1) | Xylose (%; w/v) | 0.4 | 0.6 | 0.8 |
| B(X2) | pH | 5.0 | 6.0 | 7.0 |
| C(X3) | Feather (%; w/v) | 1.0 | 1.25 | 1.5 |
| D(X4) | Inoculum (%; v/v) | 1.0 | 2.0 | 3.0 |
