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Coded and actual levels of independent variables for optimization of total polyphenol extraction yield as determined by Box−Behnken design
| Independent Variables | Coded Levels | ||
|---|---|---|---|
| –1 | 0 | + 1 | |
| Extraction Temperature (°C) | 40 | 50 | 60 |
| Amplitude Level (%) | 30 | 60 | 90 |
| Water/meal ratio | 20 | 30 | 40 |
| Extraction Time (Minutes) | 20 | 40 | 60 |
| Extraction pH | 4 | 6 | 8 |
