TABLE 4
Structural elements affecting the inhibitory activity of flavonoids
Structure of Flavonoids |  | ||||
|---|---|---|---|---|---|
| Functional Group | Compound Name | Structure | Percentage of Inhibition | ||
| 4′-Hydroxyl group | Apigenin |
| 52.5 | ||
| Chrysin |
| 48.6 | |||
| Methylation of 4′-hydroxyl group | Luteolin |
| 100 | ||
| Diosmetin |
| 49.1 | |||
| 2′-Hydroxyl group | Morin |
| 100 | ||
| Kaempferol |
| 71.3 | |||
| 3′-Hydroxyl group | Luteolin | See above | 100 | ||
| Apigenin | See above | 52.5 | |||
| 5-Hydroxyl group | Fisetin |
| 93.9 | ||
|
| Quercetin |
| 84.7 | ||