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Optimization of the extraction solvent (shown as recovery).
| Solvents | Low | Middle | High |
|---|---|---|---|
| Ethyl acetate | 66% | 70% | 65% |
| Methanol-tetrahydrofuran (1:1) | 70% | 67% | 65% |
| Methanol –trichloromethane (1:1) |
70% |
72% |
71% |
| Methanol |
A great deal of impure peaks |
||
| Acetone- ethyl acetate (2:1) | 80% | 82% | 78% |
| Acetone -ethyl acetate (1:1) | 81% | 80% | 83% |
| Acetone -ethyl acetate (1:2) | 82% | 81% | 83% |
