Table 1.
Level and code of independent variable used for response surface analysis.
| Level | A: Extraction Time (min) | B: Ethanol Content (%) | C: Ratio of Liquor to Material (v/w) |
|---|---|---|---|
| −1 | 45 | 50 | 40 |
| 0 | 60 | 60 | 50 |
| 1 | 75 | 70 | 60 |
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