Research Article
Optimized Extraction Method for Kleeb Bua Daeng Formula with the Aid of the Experimental Design
Table 1
Box–Behnken design for the optimization of extraction conditions.
| | Factor | Symbol | Levels | | −1 | 0 | 1 |
| | Type of solvent | A | Ethyl acetate | Ethanol | Methanol | | Number of extraction times (times) | B | 1 | 2 | 4 | | Material-to-solvent ratio (g/ml) | C | 1 : 3 | 1 : 6 | 1 : 9 |
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