Independent factors and their levels used in MAE.
| Independent factor | Symbol | Levels | ||
|---|---|---|---|---|
| −1 | 0 | 1 | ||
| Extraction time (min) | A | 10 | 15 | 20 |
| Extraction temperature (°C) | B | 50 | 60 | 70 |
| Solvent-to-solid ratio (mL g−1) | C | 20 : 1 | 25 : 1 | 30 : 1 |
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