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Areas of variation of the experimental conditions necessary to improve the extraction of polyphenols from apples using sonication.
| Variable | (−1.68) | (−1) | (0) | (1) | (1.68) |
|---|---|---|---|---|---|
| Ethanol concentration (%) | 33.2 | 40 | 50 | 60 | 66.8 |
| Temperature (°C) | 43.2 | 50 | 60 | 70 | 76.8 |
| Extraction time (min) | 1.6 | 5 | 10 | 15 | 23.4 |
