Table 3.
Analysis of variance for TPC and crude extraction yield quadratic models∗.
| Source | TPC (mg GAE/g d.w) |
EY (%) |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Sum of squares | df | Mean square | F-value | P-value P > F |
Sum of square | df | Mean squares | F-value | P-value P > F | |
| Model | 4994.74 | 9 | 554.97 | 41.16 | <0.0001 | 203.44 | 9 | 22.60 | 72.95 | <0.0001 |
| A | 1677.70 | 1 | 1697.70 | 125.90 | <0.0001 | 26.79 | 1 | 26.79 | 86.47 | <0.0001 |
| B | 1029.67 | 1 | 1029.67 | 76.36 | <0.0001 | 51.92 | 1 | 51.92 | 167.56 | <0.0001 |
| C | 112.95 | 1 | 112.95 | 8.38 | 0.0232 | 16.59 | 1 | 16.59 | 53.54 | 0.0002 |
| A2 | 472.94 | 1 | 472.94 | 35.07 | 0.0006 | 48.57 | 1 | 48.57 | 156.75 | <0.0001 |
| B2 | 0.92 | 1 | 0.92 | 0.068 | 0.8011 | 40.17 | 1 | 40.17 | 129.65 | <0.0001 |
| C2 | 304.44 | 1 | 304.44 | 22.58 | 0.0021 | 12.69 | 1 | 12.69 | 40.97 | 0.0004 |
| AB | 1148.87 | 1 | 1148.87 | 85.20 | <0.0001 | 1.53 | 1 | 1.53 | 4.92 | 0.0620 |
| AC | 70.48 | 1 | 70.48 | 5.23 | 0.0561 | 8.73 | 1 | 8.73 | 28.18 | 0.0011 |
| BC | 105.58 | 1 | 105.58 | 7.83 | 0.0266 | 0.54 | 1 | 0.54 | 1.74 | 0.2282 |
| Residual | 94.39 | 7 | 13.48 | 2.17 | 7 | 0.31 | ||||
| Lack of fit | 75.30 | 3 | 25.10 | 5.26 | 0.0713 | 1.39 | 3 | 0.46 | 2.39 | 0.2092 |
| Pure error | 19.09 | 4 | 4.77 | 0.78 | 4 | 0.19 | ||||
| Cor. Total | 5089.13 | 18 | 205.61 | 16 | ||||||
| CV% | 12.05 | 3.17 | ||||||||
| PRESS | 1234.62 | 23.50 | ||||||||
| Adeq Precision | 22.380 | 36.512 | ||||||||
| R2 | 0.9815 | 0.9895 | ||||||||
| Adj R2 | 0.9576 | 0.9759 | ||||||||
| Pred R2 | 0.7574 | 0.8857 | ||||||||
∗
A is extraction temperature; B is S/L ratio; C is extraction time.