Table 1.
Factors and levels of orthogonal test
| No | Factor | |||
| A (ethanol concentration) (%) |
B (ratio of solvent to raw material) |
C (extraction temperature) (°) |
D (extraction time) (h) |
|
| 1 | 55 | 25 | 65 | 1.5 |
| 2 | 60 | 30 | 70 | 2 |
| 3 | 65 | 35 | 75 | 2.5 |
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