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Different extraction parameters used for triterpenoid extraction from Swertia chirata
| Variable code | Variables | High level (+) | Low level (−) |
|---|---|---|---|
| X 1 | Temperature | 70 °C | 35 °C |
| X 2 | Time | 60 min. | 30 min. |
| X 3 | Solvent composition (methanol and ethyl acetate ratio) | 80% (v/v) | 20% (v/v) |
| X 4 | Solvent:solid ratio | 60:1 (ml/g) | 30:1 (ml/g) |
| X 5 | Particle size | 6 mm | 3 mm |
