Table 1.
Central composite design with code values and observed response values (n = 3, mean ± SD).
| No. | Code values of variables |
Actual values of variables |
Responses |
||||
|---|---|---|---|---|---|---|---|
| X1 | X2 | Amount of pterostilbene (mg) | Volume of hydration solution (mL) | YEE (%) | YDL (%) | YHD (nm) | |
| 1 | 0 | 0 | 11 | 9 | 68.7 ± 1.0 | 17.2 ± 0.3 | 138.2 ± 3.6 |
| 2 | −1 | 1 | 4.64 | 13.24 | 95.1 ± 4.3 | 11.7 ± 3.0 | 81.0 ± 2.9 |
| 3 | 1 | 1 | 17.36 | 13.24 | 68.5 ± 1.5 | 22.1 ± 1.5 | 169.2 ± 5.1 |
| 4 | 0 | −1.414 | 11 | 3 | 25.9 ± 0.4 | 6.5 ± 0.1 | 132.3 ± 5.6 |
| 5 | 1.414 | 0 | 20 | 9 | 28.0 ± 0.3 | 10.6 ± 0.1 | 132.7 ± 5.4 |
| 6 | −1.414 | 0 | 2 | 9 | 90.8 ± 1.4 | 5.2 ± 0.1 | 74.5 ± 2.3 |
| 7 | −1 | −1 | 4.64 | 4.76 | 72.9 ± 1.0 | 9.0 ± 0.1 | 85.4 ± 2.0 |
| 8 | 0 | 0 | 11 | 9 | 68.8 ± 0.4 | 17.2 ± 0.1 | 138.3 ± 2.3 |
| 9 | 0 | 0 | 11 | 9 | 67.7 ± 0.2 | 16.9 ± 0.1 | 134.2 ± 2.0 |
| 10 | 1 | −1 | 17.36 | 4.76 | 25.8 ± 0.3 | 8.9 ± 0.1 | 117.0 ± 2.7 |
| 11 | 0 | 0 | 11 | 9 | 67.8 ± 0.7 | 17.0 ± 0.2 | 134.2 ± 1.2 |
| 12 | 0 | 1.414 | 11 | 15 | 90.3 ± 1.1 | 22.6 ± 0.3 | 150.1 ± 2.0 |
| 13 | 0 | 0 | 11 | 9 | 59.0 ± 1.3 | 14.8 ± 0.2 | 147.9 ± 1.5 |