Table 5.
Independent variables and their levels used in BBD.
| Symbols | Independent Variables | Levels | ||
|---|---|---|---|---|
| −1 | 0 | +1 | ||
| X 1 | Solvent concentration (%, v/v) | 40 | 60 | 100 |
| X 2 | Temperature (°C) | 75 | 100 | 125 |
| X 3 | Time (min) | 1 | 3 | 5 |
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