Table 2.
Analysis of variance of the second order polynomial models for the responses
| Source | df | Sum of Squares | Mean Square | F-value | p-value |
|---|---|---|---|---|---|
| Hesperetin | |||||
| Regression | 9 | 9.24 | 1.03 | 18.40 | 0.0004 |
| Lack of Fit | 5 | 0.38 | 0.08 | 11.11 | 0.0847 |
| Pure error | 2 | 0.01 | 0.01 | ||
| R2 | 0.96 | R2adj | 0.91 | ||
| Naringenin | |||||
| Regression | 9 | 0.17 | 0.02 | 43.11 | 0.0000 |
| Lack of Fit | 5 | 0.00 | 0.00 | 7.01 | 0.1295 |
| Pure error | 2 | 0.00 | 0.00 | ||
| R2 | 0.98 | R2adj | 0.96 | ||
| TPC | |||||
| Regression | 9 | 20119.83 | 2235.54 | 8.24 | 0.0055 |
| Lack of Fit | 5 | 1335.92 | 267.189 | 0.975 | 0.5854 |
| Pure error | 2 | 564.00 | 282.00 | ||
| R2 | 0.91 | R2adj | 0.80 | ||
| DPPH RSC | |||||
| Regression | 9 | 196.00 | 21.78 | 27.18 | 0.0001 |
| Lack of Fit | 5 | 4.93 | 0.99 | 2.92 | 0.2748 |
| Pure error | 2 | 0.68 | 0.34 | ||
| R2 | 0.97 | R2adj | 0.94 | ||
| FRAP | |||||
| Regression | 9 | 5322.80 | 591.42 | 8.90 | 0.0044 |
| Lack of Fit | 5 | 396.77 | 79.35 | 2.31 | 0.3290 |
| Pure error | 2 | 68.65 | 34.33 | ||
| R2 | 0.92 | R2adj | 0.82 | ||
R2, the coefficient of determination; R2adj, the adjusted coefficient
TPC total phenolic compounds, DPPH RSC 2,2-diphenyl-1-picrylhydrazyl radical’s scavenging capacity, FRAP ferric reducing antioxidant power, GAE gallic acid equivalent, QE quercetin equivalent, AAE ascorbic acid equivalent.