Table 1.
Coded values and independent variables of the response surface experiment.
| Coded Level | Independent Variable | ||
|---|---|---|---|
| X1: pH | X2: Temperature (°C) | X3: Substrate Concentration (mg/mL) | |
| −1 | 7.5 | 27 | 10 |
| 0 | 8.0 | 32 | 15 |
| 1 | 8.5 | 37 | 20 |
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