Table 7.
Prediction of antioxidant activity in leaves and flowers of Trifolium germplasm, based on multiple regression analysis of accession mean values of each antioxidant assay on accession mean concentrations of groups of phenolic compounds. Group concentrations in the models (in parentheses) are expressed as mg g−1 dry matter.
| Antioxidant Activity Assay | Best Linear Model | Model F Probability | Adjusted R2 |
|---|---|---|---|
| Leaves | |||
| Fremy’s salt scavenging * | 3.368 + 0.373 *(clovamides) − 0.026 *(isoflavones) | < 0.001 | 0.934 |
| Superoxid anion scavenging * | 1.194 + 0.059 *(clovamides) + 0.468 *(proanthocyanidins) | < 0.001 | 0.685 |
| Peroxyl radical scavenging * * | −2.217 − 12.624 *(phenolic acids) + 4.012 *(clovamides) + 1.317 *(other flavonoids) + 1.765 *(isoflavones) | < 0.05 | 0.554 |
| Flowers | |||
| Fremy’s salt scavenging * | 5.444 − 1.886 *(phenolic acids) + 0.233 *(other flavonoids) | < 0.001 | 0.524 |
| Superoxid anion scavenging * | 0.887 − 0.230 *(clovamides) + 0.127 *(other flavonoids) | < 0.001 | 0.728 |
| Peroxyl radical scavenging ** | −242.1 + 217.8 *(phenolic acids) − 80.8 *(clovamides) + 16.5 *(other flavonoids) + 52.5 *(isoflavones) | < 0.05 | 0.601 |
* μmol gallic acid equivalents (GAE)/100 g freeze-dried matter; ** mmol Trolox equivalents (TE)/100 g freeze-dried matter