Table 4 The matrix of central composite design (CCD) and experimental data obtained for the response variables studied ( Y 1 - Y 5 ) (mean ± SD)
Treatment runs | Blocks | Independent variables | Response variables | ||||||
|---|---|---|---|---|---|---|---|---|---|
Temperature (°C),X 1 | Time (min),X 2 | pH,X 3 | Colour L,Y 1 | Colour a,Y 2 | Colour b,Y 3 | Browning index,Y 4 | Fracturability (g/s),Y 5 | ||
8 | 2 | 100.00 | 30.00 | 5.00 | 53.10 ± 0.54a | 3.85 ± 0.05c | 8.41 ± 0.17b | 22.41 ± 0.23c | 1315.48 ± 3.36b |
9 | 2 | 100.00 | 5.00 | 7.00 | 43.85 ± 0.08d | 2.19 ± 0.04e | 5.32 ± 0.07e | 16.50 ± 0.22d | 1221.65 ± 3.23c |
10 | 2 | 180.00 | 30.00 | 7.00 | 47.17 ± 0.45c | 2.85 ± 0.12d | 9.04 ± 0.29a | 25.51 ± 0.71b | 1546.31 ± 15.09a |
11(C) | 2 | 140.00 | 17.50 | 6.00 | 48.41 ± 0.39c | 2.82 ± 0.07d | 7.39 ± 0.07c | 20.70 ± 0.19c | 1289.27 ± 5.87c |
12(C) | 2 | 140.00 | 17.50 | 6.00 | 49.12 ± 0.29bc | 2.83 ± 0.13d | 7.23 ± 0.11c | 19.80 ± 0.06d | 1419.53 ± 20.03b |
7 | 2 | 180.00 | 5.00 | 5.00 | 48.67 ± 0.08c | 4.79 ± 0.09a | 8.51 ± 0.08b | 26.12 ± 0.50b | 1117.77 ± 8.20d |
2 | 1 | 180.00 | 30.00 | 5.00 | 41.71 ± 0.09d | 4.97 ± 0.09a | 9.76 ± 0.27a | 35.18 ± 1.10a | 920.68 ± 17.92e |
6(C) | 1 | 140.00 | 17.50 | 6.00 | 49.40 ± 0.32bc | 2.79 ± 0.08d | 7.33 ± 0.21c | 20.06 ± 0.49c | 1247.72 ± 11.96c |
5(C) | 1 | 140.00 | 17.50 | 6.00 | 50.78 ± 0.42b | 3.00 ± 0.06d | 7.98 ± 0.08c | 21.28 ± 0.11c | 1216.48 ± 14.16c |
4 | 1 | 100.00 | 30.00 | 7.00 | 51.21 ± 0.41b | 2.22 ± 0.02e | 6.79 ± 0.15d | 17.29 ± 0.24d | 1147.99 ± 17.68d |
3 | 1 | 180.00 | 5.00 | 7.00 | 49.37 ± 0.57bc | 2.82 ± 0.05d | 6.59 ± 0.11d | 18.40 ± 0.20d | 1430.61 ± 17.06b |
1 | 1 | 100.00 | 5.00 | 5.00 | 43.82 ± 0.06d | 4.41 ± 0.07b | 7.02 ± 0.04d | 24.68 ± 0.08b | 1146.64 ± 8.53d |
20(C) | 3 | 140.00 | 17.50 | 6.00 | 50.54 ± 0.35b | 3.22 ± 0.03d | 7.52 ± 0.09c | 20.65 ± 0.02c | 1251.09 ± 16.27c |
13 | 3 | 74.68 | 17.50 | 6.00 | 36.75 ± 6.37e | 3.11 ± 0.14d | 4.84 ± 0.15e | 20.21 ± 0.56c | 981.28 ± 19.17e |
19(C) | 3 | 140.00 | 17.50 | 6.00 | 49.10 ± 0.32bc | 2.93 ± 0.06d | 7.27 ± 0.04c | 20.27 ± 0.25c | 1302.49 ± 16.28b |
17 | 3 | 140.00 | 17.50 | 4.37 | 51.76 ± 1.03b | 4.18 ± 0.08b | 8.49 ± 0.31b | 23.69 ± 0.24b | 1215.75 ± 16.54c |
16 | 3 | 140.00 | 37.91 | 6.00 | 45.53 ± 0.49d | 2.61 ± 0.03de | 7.06 ± 0.21d | 20.91 ± 0.33c | 991.15 ± 5.14e |
18 | 3 | 140.00 | 17.50 | 7.63 | 50.49 ± 0.54b | 1.51 ± 0.03f | 7.42 ± 0.12c | 24.86 ± 0.12b | 1679.96 ± 23.81a |
15 | 3 | 140.00 | -2.91 | 6.00 | 51.06 ± 0.37b | 2.37 ± 0.11e | 6.74 ± 0.25d | 17.46 ± 0.84d | 518.60 ± 10.11f |
14 | 3 | 205.32 | 17.50 | 6.00 | 42.88 ± 1.29d | 5.11 ± 0.18a | 10.06 ± 0.44a | 34.93 ± 0.93a | 665.62 ± 12.26f |