Table 2.
Central composite design and experimental data for 4-level-4-factor response surface analysis.
| Run | X 1 | X 2 | X 3 | X 4 | Res1 | Res2 | Res3 | Res4 | Res5 | Res6 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UAE | MAE | UAE/MAE | UAE/MAE | UAE | MAE | UAE | MAE | UAE | MAE | UAE | MAE | UAE | MAE | UAE | MAE | UAE | MAE | |
| 1 | 1 | 5 | 15 | 25 | 12.5 | 45.0 | 182 | 112 | 8.9 | 6.4 | 1.13 | 0.94 | 62 | 66 | 3.1 | 4.0 | 83.2 | 75.0 |
| 2 | 2 | 10 | 15 | 25 | 12.5 | 45.0 | 149 | 140 | 7.3 | 7.0 | 0.95 | 1.16 | 64 | 67 | 3.4 | 3.8 | 83.6 | 74.4 |
| 3 | 1 | 5 | 35 | 25 | 12.5 | 45.0 | 134 | 112 | 6.4 | 5.7 | 0.77 | 0.80 | 60 | 62 | 3.4 | 4.2 | 83.3 | 74.3 |
| 4 | 2 | 10 | 35 | 25 | 12.5 | 45.0 | 153 | 129 | 7.3 | 6.6 | 0.88 | 0.76 | 61 | 51 | 3.4 | 3.4 | 83.4 | 77.8 |
| 5 | 1 | 5 | 15 | 75 | 12.5 | 45.0 | 109 | 108 | 6.7 | 5.8 | 0.73 | 0.72 | 66 | 73 | 3.6 | 4.5 | 83.1 | 72.3 |
| 6 | 2 | 10 | 15 | 75 | 12.5 | 45.0 | 113 | 113 | 6.4 | 6.2 | 0.96 | 1.09 | 66 | 71 | 3.6 | 3.7 | 85.8 | 72.6 |
| 7 | 1 | 5 | 35 | 75 | 12.5 | 45.0 | 124 | 141 | 7.0 | 7.5 | 0.96 | 1.13 | 66 | 40 | 3.1 | 3.3 | 86.6 | 78.0 |
| 8 | 2 | 10 | 35 | 75 | 12.5 | 45.0 | 128 | 120 | 7.0 | 6.4 | 0.88 | 0.89 | 64 | 65 | 3.7 | 3.5 | 86.3 | 77.3 |
| 9 | 1 | 5 | 15 | 25 | 27.5 | 85.0 | 170 | 83 | 8.6 | 5.6 | 1.14 | 0.90 | 63 | 67 | 3.1 | 3.6 | 83.1 | 73.8 |
| 10 | 2 | 10 | 15 | 25 | 27.5 | 85.0 | 190 | 81 | 13 | 5.6 | 2.06 | 0.88 | 63 | 89 | 3.0 | 4.1 | 83.0 | 73.5 |
| 11 | 1 | 5 | 35 | 25 | 27.5 | 85.0 | 133 | 116 | 6.6 | 6.2 | 0.79 | 1.02 | 44 | 65 | 3.4 | 3.6 | 83.8 | 75.2 |
| 12 | 2 | 10 | 35 | 25 | 27.5 | 85.0 | 139 | 108 | 6.8 | 6.7 | 0.89 | 0.86 | 57 | 55 | 3.4 | 3.7 | 83.3 | 76.3 |
| 13 | 1 | 5 | 15 | 75 | 27.5 | 85.0 | 143 | 54 | 7.7 | 7.2 | 1.13 | 1.03 | 65 | 70 | 3.4 | 2.6 | 85.7 | 59.3 |
| 14 | 2 | 10 | 15 | 75 | 27.5 | 85.0 | 125 | 25 | 7.0 | 4.0 | 0.96 | 0.47 | 66 | 66 | 3.9 | 3.9 | 85.4 | 74.9 |
| 15 | 1 | 5 | 35 | 75 | 27.5 | 85.0 | 116 | 66 | 6.5 | 6.3 | 0.83 | 0.93 | 64 | 67 | 3.6 | 3.4 | 85.3 | 76.4 |
| 16 | 2.5 | 10 | 35 | 75 | 27.5 | 85.0 | 119 | 60 | 6.8 | 6.7 | 0.95 | 0.91 | 63 | 65 | 3.7 | 3.9 | 86.4 | 79.0 |
| 17 | 0.5 | 2.5 | 25 | 50 | 20 | 65.0 | 159 | 107 | 8.4 | 6.2 | 0.96 | 0.87 | 64 | 56 | 3.4 | 3.6 | 85.2 | 74.0 |
| 18 | 2.5 | 12.5 | 25 | 50 | 20 | 65.0 | 174 | 77 | 8.4 | 6.2 | 1.21 | 0.94 | 65 | 68 | 3.1 | 3.7 | 84.7 | 75.5 |
| 19 | 1.5 | 7.5 | 5 | 50 | 20 | 65.0 | 198 | 97 | 9.6 | 6.0 | 1.28 | 0.99 | 68 | 72 | 3.5 | 4.1 | 84.8 | 72.9 |
| 20 | 1.5 | 7.5 | 45 | 50 | 20 | 65.0 | 160 | 80 | 7.8 | 6.6 | 1.02 | 0.99 | 63 | 53 | 3.0 | 3.6 | 84.8 | 75.3 |
| 21 | 1.5 | 7.5 | 25 | 0 | 20 | 65.0 | 175 | 155 | 8.2 | 6.4 | 1.03 | 0.86 | 62 | 59 | 3.1 | 3.3 | 83.2 | 76.1 |
| 22 | 1.5 | 7.5 | 25 | 100 | 20 | 65.0 | 72 | 53 | 6.5 | 6.1 | 0.64 | 0.76 | 62 | 65 | 4.0 | 3.8 | 76.3 | 74.0 |
| 23 | 1.5 | 7.5 | 25 | 50 | 5 | 25.0 | 134 | 135 | 6.7 | 6.8 | 0.81 | 0.78 | 65 | 69 | 3.0 | 3.1 | 84.9 | 77.7 |
| 24 | 1.5 | 7.5 | 25 | 50 | 35 | 105 | 179 | 49 | 8.3 | 6.6 | 1.15 | 0.93 | 65 | 56 | 3.2 | 5.7 | 84.7 | 73.1 |
| 25 | 1.5 | 7.5 | 25 | 50 | 20 | 65.0 | 143 | 185 | 7.4 | 6.7 | 0.99 | 1.04 | 63 | 59 | 3.5 | 3.5 | 84.5 | 76.7 |
| 26 | 1.5 | 7.5 | 25 | 50 | 20 | 65.0 | 184 | 115 | 9.2 | 6.0 | 1.21 | 0.87 | 64 | 69 | 3.4 | 3.7 | 84.5 | 73.5 |
| 27 | 1.5 | 7.5 | 25 | 50 | 20 | 65.0 | 135 | 112 | 6.6 | 5.9 | 0.96 | 0.93 | 64 | 68 | 3.5 | 3.6 | 86.5 | 73.5 |
| 28 | 1.5 | 7.5 | 25 | 50 | 20 | 65.0 | 187 | 127 | 9.0 | 6.2 | 1.20 | 0.86 | 64 | 68 | 3.4 | 3.5 | 85 | 74.1 |
| 29 | 1.5 | 7.5 | 25 | 50 | 20 | 65.0 | 161 | 126 | 7.7 | 6.2 | 0.98 | 0.90 | 64 | 67 | 3.3 | 3.5 | 85.2 | 74.0 |
| 30 | 1.5 | 7.5 | 25 | 50 | 20 | 65.0 | 169 | 115 | 8.6 | 6.8 | 0.95 | 1.09 | 64 | 65 | 2.9 | 3.3 | 84.8 | 73.3 |
| 31 | 1.5 | 7.5 | 25 | 50 | 20 | 65.0 | 165 | 112 | 8.0 | 7.0 | 1.03 | 1.08 | 65 | 64 | 3.4 | 3.3 | 84.6 | 74.1 |
X1: Time (min), X2: Ratio (g/L), X3: Concentration (% methanol), X4: Temperature (°C), and Res1: Total betacyanins (mg/g), Res2: Total phenolic acids (mg/g), Res3: Total flavonoids (mg/g), Res4: Extractable solid (mg/g), Res5: Antioxidant activity (mg/mL), Res6: Color (a* coordinates).