Factor | level | ||
1 | 2 | 3 | |
Ratio of solid to liquid (A) | 1:1.5 | 1:2 | 1:2.5 |
Extraction time (B)/min | 3 | 5 | 8 |
Ratio of solvent (C) | 1:1 | 2:1 | 4:1 |