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The factor of extraction and its level used in BBD for optimization.
| Factors | Symbol | Range and Level |
||
|---|---|---|---|---|
| Low (-1) | Medium (0) | High (1) | ||
| Betaine–sorbitol ratio (mol) | X1 | 0.5:1.2 | 1.25:1.2 | 2:1.2 |
| Extraction time (min) | X2 | 10 | 35 | 60 |
| Solid–Liquid ratio (g/mL) | X3 | 1:10 | 1:20 | 1:30 |
