Table 2.
Box–Behnken design for independent variables and observed responses.
| Run no. | Experimental design | Dependent variables | |||
|---|---|---|---|---|---|
| Liquid-solid ratio | Ultrasonic time | Extraction temperature | Ultrasonic power | Yield (%) | |
| 1 | −1 | −1 | 0 | 0 | 1.122 |
| 2 | 1 | −1 | 0 | 0 | 1.206 |
| 3 | −1 | 1 | 0 | 0 | 1.11 |
| 4 | 1 | 1 | 0 | 0 | 1.157 |
| 5 | 0 | 0 | −1 | −1 | 1.224 |
| 6 | 0 | 0 | 1 | −1 | 1.191 |
| 7 | 0 | 0 | −1 | 1 | 1.213 |
| 8 | 0 | 0 | 1 | 1 | 1.229 |
| 9 | −1 | 0 | 0 | −1 | 1.12 |
| 10 | 1 | 0 | 0 | −1 | 1.172 |
| 11 | −1 | 0 | 0 | 1 | 1.128 |
| 12 | 1 | 0 | 0 | 1 | 1.198 |
| 13 | 0 | −1 | −1 | 0 | 1.221 |
| 14 | 0 | 1 | −1 | 0 | 1.172 |
| 15 | 0 | −1 | 1 | 0 | 1.217 |
| 16 | 0 | 1 | 1 | 0 | 1.18 |
| 17 | −1 | 0 | −1 | 0 | 1.137 |
| 18 | 1 | 0 | −1 | 0 | 1.211 |
| 19 | −1 | 0 | 1 | 0 | 1.154 |
| 20 | 1 | 0 | 1 | 0 | 1.19 |
| 21 | 0 | −1 | 0 | −1 | 1.18 |
| 22 | 0 | 1 | 0 | −1 | 1.173 |
| 23 | 0 | −1 | 0 | 1 | 1.189 |
| 24 | 0 | 1 | 0 | 1 | 1.175 |
| 25 | 0 | 0 | 0 | 0 | 1.253 |
| 26 | 0 | 0 | 0 | 0 | 1.26 |
| 27 | 0 | 0 | 0 | 0 | 1.247 |
| 28 | 0 | 0 | 0 | 0 | 1.25 |
| 29 | 0 | 0 | 0 | 0 | 1.258 |