Table 2 Central composite rotatable design arrangement and responses
Variable levels | Yield (%) | ||||
|---|---|---|---|---|---|
Design point | A: water content (wt. %) | B: Methanol to oil molar ratio | C: Enzyme concentration (wt. %) | Experimental | Predicted |
1 | 2.00 | 2.00 | 10.00 | 50.7 | 51.0 |
2 | 7.00 | 2.00 | 10.00 | 81.4 | 79.7 |
3 | 2.00 | 5.00 | 10.00 | 70.2 | 65.8 |
4 | 7.00 | 5.00 | 10.00 | 81.2 | 83.9 |
5 | 2.00 | 2.00 | 15.00 | 65.6 | 62.6 |
6 | 7.00 | 2.00 | 15.00 | 77.7 | 81.8 |
7 | 2.00 | 5.00 | 15.00 | 73.4 | 74.8 |
8 | 7.00 | 5.00 | 15.00 | 84.2 | 83.6 |
9 | 0.30 | 3.50 | 12.50 | 46.2 | 49.4 |
10 | 8.70 | 3.50 | 12.50 | 83.7 | 80.9 |
11 | 4.50 | 0.98 | 12.50 | 67.2 | 67.3 |
12 | 4.50 | 6.02 | 12.50 | 80.8 | 81.2 |
13 | 4.50 | 3.50 | 8.30 | 75.8 | 77.5 |
14 | 4.50 | 3.50 | 16.70 | 88.1 | 86.9 |
15 | 4.50 | 3.50 | 12.50 | 92.1 | 89.5 |
16 | 4.50 | 3.50 | 12.50 | 90.9 | 89.5 |
17 | 4.50 | 3.50 | 12.50 | 90.1 | 89.5 |
18 | 4.50 | 3.50 | 12.50 | 90.3 | 89.5 |
19 | 4.50 | 3.50 | 12.50 | 86.1 | 89.5 |
20 | 4.50 | 3.50 | 12.50 | 87.7 | 89.5 |