Table 1.
Independent variables and their levels used in the RSM design
| Levels | |||
|---|---|---|---|
| −1 | 0 | 1 | |
| Ethanol concentration (%) (A) | 50 | 60 | 70 |
| Extraction time (h) (B) | 1.5 | 2 | 2.5 |
| Extraction temperature (°C) (C) | 50 | 60 | 70 |
| liquid–solid ratio (mL/g) (D) | 20 | 30 | 40 |
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