Table 1.
Response surface analysis factors and levels.
| Variables | Level |
||
|---|---|---|---|
| −1 | 0 | 1 | |
| X1 solid-to-liquid ratio (v/w) | 10 | 20 | 30 |
| X2 extraction time (min) | 40 | 50 | 60 |
| X3 extraction temperature (°C) | 50 | 60 | 70 |
| X4 ethanol concentration (%) | 50 | 60 | 70 |
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