Table 1.
Arrangement and results of the three-factor/three-level response surface design.
| Run | Factor A: IL Concentration (%, w/w) | Factor B: Liquid–Solid Ratio | Factor C:Ultrasonic Irradiation Time (min) | Response Average Extraction Yield (mg/g) |
|---|---|---|---|---|
| 1 | 60 | 10:1 | 50 | 12.5521 |
| 2 | 50 | 20:1 | 50 | 15.7939 |
| 3 | 50 | 20:1 | 50 | 15.9827 |
| 4 | 60 | 30:1 | 50 | 15.4370 |
| 5 | 50 | 10:1 | 40 | 13.7683 |
| 6 | 40 | 30:1 | 50 | 12.0817 |
| 7 | 50 | 30:1 | 60 | 15.3657 |
| 8 | 50 | 10:1 | 60 | 14.5096 |
| 9 | 50 | 30:1 | 40 | 15.5716 |
| 10 | 40 | 10:1 | 50 | 12.6094 |
| 11 | 60 | 20:1 | 60 | 15.5444 |
| 12 | 60 | 20:1 | 40 | 15.7341 |
| 13 | 50 | 20:1 | 50 | 15.8536 |
| 14 | 50 | 20:1 | 50 | 15.7837 |
| 15 | 40 | 20:1 | 40 | 14.3129 |
| 16 | 50 | 20:1 | 50 | 15.5716 |
| 17 | 40 | 20:1 | 60 | 14.9624 |