Table 1.
Design and results by RSM for extraction efficiency of phenolic acid
| Run | X 1 | X2 (°C) | X3 (min) | Extraction efficiency of ferulic acid (%) | Extraction efficiency of vanilla acid (%) | ||
|---|---|---|---|---|---|---|---|
| Actual | Predicted | Actual | Predicted | ||||
| 1 | 0 (1.0) | 1 (70) | 1 (50) | 94.99 | 95.08 | 81.72 | 81.55 |
| 2 | 1 (1.8) | 0 (30) | 1 | 94.10 | 94.15 | 81.55 | 81.37 |
| 3 | 0 | − 1 (50) | − 1 (10) | 91.40 | 91.33 | 79.62 | 79.79 |
| 4 | − 1 (0.2) | 0 | 1 | 73.51 | 73.75 | 66.63 | 66.40 |
| 5 | 0 | 0 | 0 (30) | 94.18 | 94.98 | 84.37 | 84.80 |
| 6 | 0 | 0 | 0 | 95.32 | 94.98 | 85.37 | 84.80 |
| 7 | − 1 | 1 | 0 | 74.89 | 74.58 | 65.3 | 65.70 |
| 8 | 1 | 1 | 0 | 95.21 | 95.08 | 76.47 | 76.82 |
| 9 | 0 | 0 | 0 | 94.60 | 94.98 | 83.63 | 84.80 |
| 10 | 0 | 1 | − 1 | 94.11 | 94.48 | 78.48 | 77.90 |
| 11 | − 1 | 0 | − 1 | 72.70 | 72.65 | 65.54 | 65.72 |
| 12 | 1 | − 1 | 0 | 92.00 | 92.33 | 80.01 | 79.61 |
| 13 | 1 | 0 | − 1 | 93.60 | 93.35 | 78.03 | 78.26 |
| 14 | − 1 | − 1 | 0 | 71.61 | 71.73 | 63.54 | 63.19 |
| 15 | 0 | − 1 | 1 | 93.02 | 92.63 | 79.35 | 79.93 |
| 16 | 0 | 0 | 0 | 95.10 | 94.98 | 85.43 | 84.80 |
| 17 | 0 | 0 | 0 | 95.71 | 94.98 | 85.19 | 84.80 |