Table 3.
Central composite design (CCD) matrix for moisture residue content (MRR), vitamin C loss ratio (VCLR), total phenolic content loss ratio (TPCLR), and ellagic acid loss ratio (EALR) for semi-dried raspberr ies under cool-air drying conditions and vacuum
| Test runs | Temp (°C) | Time (h) | MRR (%) | VCLR (%) | TPCLR (%) | EALR (%) |
| 1 | 20 (-1)a | 22 (-1) | 86.52 | 27.36 | 17.16 | 32.63 |
| 2 | 20 (-1) | 66 (+1) | 61.37 | 47.77 | 46.58 | 55.69 |
| 3 | 40 (+1) | 22 (-1) | 61.35 | 33.53 | 22.17 | 49.16 |
| 4 | 40 (+1) | 66 (+1) | 36.83 | 53.87 | 70.73 | 62.23 |
| 5 | 20 (-1) | 44 (0) | 64.47 | 41.57 | 42.83 | 49.94 |
| 6 | 40 (+1) | 44 (0) | 45.47 | 44.11 | 58.06 | 74.03 |
| 7 | 30 (0) | 22 (-1) | 78.50 | 23.62 | 17.04 | 43.34 |
| 8 | 30 (0) | 66 (+1) | 51.90 | 60.54 | 64.52 | 63.83 |
| 9 | 30 (0) | 44 (0) | 65.93 | 48.18 | 50.35 | 49.07 |
| 10 | 30 (0) | 44 (0) | 61.73 | 48.14 | 51.38 | 51.39 |
| 11 | 30 (0) | 44 (0) | 62.64 | 48.77 | 52.48 | 50.17 |
| 12 | 30 (0) | 44 (0) | 63.66 | 49.47 | 55.74 | 48.46 |
| 13 | 30 (0) | 44 (0) | 61.53 | 49.96 | 53.87 | 50.07 |
The numbers in brackets are the coded level for process variables.