1H NMR (500 MHz) spectral data of luteolin and glucosides in DMSO-d6.
| Position | δ H (J, Hz) | |||||
|---|---|---|---|---|---|---|
| Luteolin (1) | Luteolin 3′-O-β-glucoside (2) | Luteolin 4′-O-β-glucoside (3) | Luteolin 7-O-β-glucoside (4) | Luteolin 7,3′-di-O-β-glucoside (5) | Luteolin 7,4′-di-O-β-glucoside (6) | |
| 3 | 6.67 (s) | 6.77 (s) | 6.82 (s) | 6.74 (s) | 6.79 (s) | 6.92 (s) |
| 5-OH | 12.97 (s) | 12.98 (s) | 12.91 (s) | 13.07 (s) | 12.96 (s) | 12.96 (s) |
| 6 | 6.19 (s) | 6.16 (s) | 6.19 (d, J = 1.9 Hz) | 6.44 (d, J = 2.1 Hz) | 6.44 (d, J = 2.1 Hz) | 6.45 (d, J = 2.0 Hz) |
| 7-OH | 10.81 (s) | |||||
| 8 | 6.44 (s) | 6.50 (s) | 6.49 (d, J = 1.9 Hz) | 6.79 (d, J = 1.9 Hz) | 6.75 (s) | 6.86 (d, J = 2.0 Hz) |
| 2′ | 7.40 (d, J = 2.6 Hz) | 7.63 (m) | 7.49 (d, J = 2.1 Hz) | 7.43 (m) | 7.42 (d, J = 1.7 Hz) | 7.54 (d, J = 2.0 Hz) |
| 3′-OH | 9.47 (s) | |||||
| 4′-OH | 9.92 (s) | |||||
| 5′ | 6.89 (d, J = 8.2 Hz) | 6.93 (d, J =8.5 Hz) | 7.24 (d, J = 8.6 Hz) | 6.89 (d, J = 8.2 Hz) | 6.90 (d, J = 8.3 Hz) | 7.26 (d, J = 8.6 Hz) |
| 6′ | 7.42 (m) | 7.76 (m) | 7.51 (dd, J = 2.2, 8.5 Hz) | 7.44 (dd, J = 2.0, 8.4 Hz) | 7.44 (dd, J = 2.1, 8.3 Hz) | 7.56 (dd, J = 2.1, 8.6 Hz) |
| 1′′ | 4.87 (d, J = 7.2 Hz) | 4.88 (d, J = 7.3 Hz) | 5.08 (d, J = 7.4 Hz) | 5.08 (d, J = 7.5 Hz) | 5.09 (d, J = 7.4 Hz) | |
| 1′′′ | 5.01 (d, J = 7.6 Hz) | 4.89 (d, J = 7.3 Hz) | ||||