Table 3. Faced central composite design for microencapsulation of caramel flavor
| Run number | Coded variable1) | Process variable | Response variable2) |
| X1 | X2 | X1 | X2 | Y |
| 1 | 0 | 0 | 2.5:7.5 | 2.5:7.5 | 83.4448 |
| 2 | 0 | 0 | 2.5:7.5 | 2.5:7.5 | 88.7147 |
| 3 | +1 | 0 | 4.0:6.0 | 2.5:7.5 | 74.9672 |
| 4 | 0 | −1 | 2.5:7.5 | 1.0:9.0 | 90.5918 |
| 5 | 0 | 0 | 2.5:7.5 | 2.5:7.5 | 83.5395 |
| 6 | −1 | 0 | 1.0:9.0 | 2.5:7.5 | 90.7476 |
| 7 | 0 | 0 | 2.5:7.5 | 2.5:7.5 | 83.9005 |
| 8 | −1 | +1 | 1.0:9.0 | 4.0:6.0 | 89.1289 |
| 9 | +1 | +1 | 4.0:6.0 | 4.0:6.0 | 67.0371 |
| 10 | +1 | −1 | 4.0:6.0 | 1.0:9.0 | 87.1872 |
| 11 | −1 | −1 | 1.0:9.0 | 1.0:9.0 | 93.1072 |
| 12 | 0 | +1 | 2.5:7.5 | 4.0:6.0 | 80.1273 |
| 13 | 0 | 0 | 2.5:7.5 | 2.5:7.5 | 84.8162 |
X1 and X2 are the ratio of core to coating material and the ratio of primary emulsion and secondary coating material, respectively.
Y is the yield of microencapsulation.