Table 1.
Independent variables and their levels used in the response surface design.
| Factors | Levels |
||
|---|---|---|---|
| −1 | 0 | 1 | |
| A | 10 | 15 | 20 |
| B | 120 | 140 | 160 |
| C | 4 | 6 | 8 |
A, inoculum concentration (%); B, volume of liquor (mL/500 mL); C, pH.
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