Table 2.
Experimental design and results for response surface analysis. A, B, and C are extraction time, alcohol content, and ratio of liquor to material (v/w), respectively.
| Run Order | Variable | Total Flavonoids Y (%) | |||
|---|---|---|---|---|---|
| A | B | C | Observed | Predicted | |
| 1 | 0 | −1 | 1 | 4.59 | 4.42 |
| 2 | −1 | 0 | 1 | 3.42 | 3.1325 |
| 3 | 0 | −1 | −1 | 3.81 | 3.42 |
| 4 | 0 | 0 | 0 | 4.38 | 4.23 |
| 5 | 1 | −1 | 0 | 4.38 | 3.9425 |
| 6 | 0 | 0 | 0 | 4.68 | 4.23 |
| 7 | 1 | 1 | 0 | 3.24 | 2.7125 |
| 8 | 0 | 0 | 0 | 4.47 | 4.23 |
| 9 | 0 | 0 | 0 | 4.71 | 4.23 |
| 10 | 1 | 0 | 1 | 4.47 | 4.0325 |
| 11 | −1 | 0 | −1 | 3.78 | 3.4825 |
| 12 | 1 | 0 | −1 | 3.33 | 2.8825 |
| 13 | −1 | −1 | 0 | 3.39 | 3.1625 |
| 14 | −1 | 1 | 0 | 3.48 | 3.1925 |
| 15 | 0 | 0 | 0 | 4.77 | 4.23 |
| 16 | 0 | 1 | −1 | 3.99 | 3.42 |
| 17 | 0 | 1 | 1 | 3.57 | 3.22 |