Table 4.
Plan and results for response surface methodology of EAP and EAF
| Run | Independent variable |
Response (%) |
||||||
| X 1 (%) | X 2 (min) | X 3 (°C) | X 4 | Observed EAP | Predicted EAP | Observed EAF | Predicted EAF | |
| 1 | 80 (+1) | 50 (+1) | 40 (−1) | 1 (−1) | 3.10 | 3.11 | 2.53 | 2.49 |
| 2 | 80 (+1) | 50 (+1) | 60 (+1) | 3 (+1) | 4.52 | 4.51 | 2.63 | 2.67 |
| 3 | 80 (+1) | 30 (−1) | 60 (+1) | 1 (−1) | 3.29 | 3.28 | 2.33 | 2.35 |
| 4 | 60 (0) | 40 (0) | 50 (0) | 2 (0) | 5.02 | 4.97 | 2.97 | 2.96 |
| 5 | 60 (0) | 40 (0) | 50 (0) | 2 (0) | 4.96 | 4.97 | 3.02 | 2.96 |
| 6 | 60 (0) | 40 (0) | 50 (0) | 2 (0) | 4.99 | 4.97 | 2.92 | 2.96 |
| 7 | 60 (0) | 40 (0) | 60 (+1) | 2 (0) | 4.91 | 4.93 | 3.23 | 3.18 |
| 8 | 40 (−1) | 30 (−1) | 40 (−1) | 1 (−1) | 3.79 | 3.79 | 2.85 | 2.81 |
| 9 | 80 (+1) | 30 (−1) | 40 (−1) | 3 (+1) | 4.07 | 4.07 | 2.12 | 2.09 |
| 10 | 60 (0) | 30 (−1) | 50 (0) | 2 (0) | 4.90 | 4.91 | 2.93 | 2.89 |
| 11 | 60 (0) | 40 (0) | 50 (0) | 1 (−1) | 4.48 | 4.49 | 2.94 | 3.01 |
| 12 | 60 (0) | 50 (+1) | 50 (0) | 2 (0) | 5.04 | 5.06 | 2.96 | 3.02 |
| 13 | 60 (0) | 40 (0) | 40 (−1) | 2 (0) | 4.49 | 4.49 | 2.75 | 2.82 |
| 14 | 40 (−1) | 50 (+1) | 40 (−1) | 1 (−1) | 4.13 | 4.12 | 2.92 | 2.91 |
| 15 | 40 (−1) | 50 (+1) | 40 (−1) | 3 (+1) | 4.93 | 4.94 | 2.56 | 2.53 |
| 16 | 80 (+1) | 50 (+1) | 40 (−1) | 3 (+1) | 4.04 | 4.04 | 2.12 | 2.14 |
| 17 | 80 (+1) | 30 (−1) | 40 (−1) | 1 (−1) | 2.60 | 2.61 | 2.11 | 2.14 |
| 18 | 80 (+1) | 50 (+1) | 60 (+1) | 1 (−1) | 3.78 | 3.79 | 2.83 | 2.80 |
| 19 | 60 (0) | 40 (0) | 50 (0) | 2 (0) | 5.02 | 4.97 | 2.93 | 2.96 |
| 20 | 40 (−1) | 30 (−1) | 60 (+1) | 1 (−1) | 4.19 | 4.19 | 3.04 | 3.01 |
| 21 | 40 (−1) | 30 (−1) | 40 (−1) | 3 (+1) | 5.16 | 5.15 | 2.71 | 2.73 |
| 22 | 40 (−1) | 30 (−1) | 60 (+1) | 3 (+1) | 5.35 | 5.35 | 3.11 | 3.15 |
| 23 | 40 (−1) | 50 (+1) | 60 (+1) | 3 (+1) | 5.16 | 5.15 | 3.08 | 3.04 |
| 24 | 80 (+1) | 30 (−1) | 60 (+1) | 3 (+1) | 4.54 | 4.54 | 2.52 | 2.53 |
| 25 | 60 (0) | 40 (0) | 50 (0) | 2 (0) | 4.94 | 4.97 | 3.01 | 2.96 |
| 26 | 60 (0) | 40 (0) | 50 (0) | 3 (+1) | 5.50 | 5.53 | 2.96 | 2.91 |
| 27 | 80 (+1) | 40 (0) | 50 (0) | 2 (0) | 3.95 | 3.95 | 2.38 | 2.35 |
| 28 | 60 (0) | 40 (0) | 50 (0) | 2 (0) | 4.94 | 4.97 | 2.96 | 2.96 |
| 29 | 40 (−1) | 40 (0) | 50 (0) | 2 (0) | 4.82 | 4.86 | 2.83 | 2.88 |
| 30 | 40 (−1) | 50 (+1) | 60 (+1) | 1 (−1) | 4.55 | 4.54 | 3.18 | 3.21 |
X 1: ethanol concentration; X 2: extraction time; X 3: extraction temperature; X 4: number of extraction cycles. The coded forms of the variables are shown in parentheses