Table 1.
Experimental range and levels of the independent variables.
| Independent variables | Range and levels |
||
|---|---|---|---|
| −1 | 0 | 1 | |
| Initial pH | 4 | 5 | 6 |
| Glucose (g/L) | 10 | 30 | 50 |
| Agitation (rpm) | 50 | 100 | 150 |
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