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| No. | X 1 extraction 4time (h) | X 2: extraction temperature (°C) | X 3: ratio of water to material (mL g−1) | Y: extraction yielda (%) |
|---|---|---|---|---|
| 1 | −1 | −1 | 0 | 12.015 |
| 2 | 1 | −1 | 0 | 12.09 |
| 3 | −1 | 1 | 0 | 12.405 |
| 4 | 1 | 1 | 0 | 12.75 |
| 5 | −1 | 0 | −1 | 11.46 |
| 6 | 1 | 0 | −1 | 10.885 |
| 7 | −1 | 0 | 1 | 11.745 |
| 8 | 1 | 0 | 1 | 12.21 |
| 9 | 0 | −1 | −1 | 9.885 |
| 10 | 0 | 1 | −1 | 12.51 |
| 11 | 0 | −1 | 1 | 12.91 |
| 12 | 0 | 1 | 1 | 10.805 |
| 13 | 0 | 0 | 0 | 14.19 |
| 14 | 0 | 0 | 0 | 14.04 |
| 15 | 0 | 0 | 0 | 14.475 |
| 16 | 0 | 0 | 0 | 13.95 |
| 17 | 0 | 0 | 0 | 13.875 |
Mean of triplicate determination.
