Research Article
Optimization of Extract Method for Cynomorium songaricum Rupr. by Response Surface Methodology
Table 2
Independent and dependent variables used in the Box-Behnken design for the optimization of C. songaricum extraction.
| Factor | Level used, actual coded | Independent variables | Low (−1) | Medium (0) | High (+1) |
| X1 = material-to-solvent ratio (g/mL) | 1/10 | 1/20 | 1/30 | X2 = ultrasonic time (min) | 20 | 40 | 60 | X3 = ultrasonic power (W) | 60 | 80 | 100 |
| Dependent variables | | | Goal |
| Y1 = content of gallic acid | | | Maximize | Y2 = content of protocatechuic acid | | | Maximize | Y3 = content of catechin | | | Maximize |
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