Table 5.
Five variables and their levels of CCRD.
| Variable | Units | Symbol | Code Levels | ||||
|---|---|---|---|---|---|---|---|
| −1.68 | −1 | 0 | 1 | 1.68 | |||
| Ethanol concentration | % (v/v) | X1 | 23.18 | 30 | 40 | 50 | 56.82 |
| Extraction time | min | X2 | 4.77 | 15 | 30 | 45 | 55.23 |
| Temperature | °C | X3 | 43.18 | 50 | 60 | 70 | 76.82 |
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