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Relative changes in the 1H and 13C NMR chemical shifts, expressed in ppm as δ (sulfate flavonoid) – δ (flavonoid).
| Position | Taxifolin-7-O-sulfate (1) |
Eriodictyol-7-O-sulfate (3) |
Narigenin-7-O-sulfate (4) |
|||
|---|---|---|---|---|---|---|
| δC | δH | δC | δH | δC | δH | |
| ipso (7) | –4.1 | – | –4.2 | – | –4.2 | – |
| ortho (6) | +4.6 | 0.49 | +5.0 | +0.47 | +4.6 | +0.45 |
| ortho (8) | +4.6 | 0.48 | +5.0 | +0.46 | +4.9 | +0.45 |
| meta (5) | –4.8 | – | –5.3 | – | –4.8 | – |
| meta (9) | –3.1 | – | –2.4 | – | –3.1 | – |
| para (10) | +3.8 | – | +3.8 | – | +3.8 | – |
