Table 1.
The experimental planning and the CCRD responses used to optimize the extraction conditions of volatile papaya compounds by HS–SPME
| Experm | Coded | Uncoded | Response-variables | ||||
|---|---|---|---|---|---|---|---|
| X1 | X2 | Teq (min) | Texp (min) | Peaks | Area (106) | Aroma | |
| 1 | 1 | − 1 | 26 | 26 | 46 | 8.53 | 6.8 |
| 2 | 1 | 1 | 26 | 54 | 61 | 11.13 | 7.4 |
| 3 | − 1 | − 1 | 4 | 26 | 39 | 7.26 | 3.1 |
| 4 | − 1 | 1 | 4 | 54 | 53 | 10.43 | 5.7 |
| 5 | 0 | 1.41 | 15 | 60 | 59 | 12.00 | 7.7 |
| 6 | 1.41 | 0 | 30 | 40 | 49 | 9.18 | 7.8 |
| 7 | 0 | − 1.41 | 15 | 20 | 34 | 6.22 | 5.2 |
| 8 | − 1.41 | 0 | 0 | 40 | 52 | 8.76 | 1.5 |
| 9 | 0 | 0 | 15 | 40 | 50 | 9.90 | 4.8 |
| 10 | 0 | 0 | 15 | 40 | 50 | 10.46 | 5.8 |
| 11 | 0 | 0 | 15 | 40 | 52 | 10.77 | 6.3 |
The experiments 9, 10 and 11 are repetitions (center point) for calculation of pure error. Teq: equilibrium time (min); Texp: fiber exposure time (min). Aroma intensity in scale of 9 cm
CCRD, Central Composite Rotatable Design