Table 4 UV absorption ranges for flavonoids [29]
From: Flavonoids: isolation, characterization, and health benefits
Absorption 1 (nm) | Absorption 2 (nm) | Types |
|---|---|---|
250–280 | 310–350 | Flavone |
250–280 | 330–360 | Flavonols (3-OH-substituted) |
250–280 | 350–385 | Flavonols (3-OH-free) |
245–275 | 310–330 shoulder | Isoflavone |
| Â | C. 320 peak | Isoflavones (5-deoxy-6,7-deoxygenated) |
275–295 | 300–330 shoulder | Flavonones and dihydroflavonols |
230–270 | 340–390 | Chalcones |
230–270 | 380–430 | Aurones |
270–280 | 465–560 | Anthocyanidins and Anthocyanins |