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Different variables for optimal extraction of flavonoids from the flowers of T. heyneana (ethyl acetate as extraction solvent, 34-L9 design).
| Levels | A | B | C | D |
|---|---|---|---|---|
| Temp. (°C) | Ext. tim. (hrs) | Material ratio (g : mL) | No. of ext. cycles | |
| 1 | 60 | 1 | 1 : 10 | 1 |
| 2 | 70 | 2 | 1 : 15 | 2 |
| 3 | 80 | 3 | 1 : 20 | 3 |
