Table 4.
UV absorption of 7-hydroxyflavanone (1) and its biotransformation products (2 ÷ 6).
| Compound | 1st band | 2nd band | 3rd band | |||
|---|---|---|---|---|---|---|
| λ max [nm] | log ε | λ max [nm] | log ε | λ max [nm] | log ε | |
| 7-Hydroxyflavanone (1) | 237 | 4.15 | 275 | 4.18 | 310 | 3.95 |
| 7-Methoxyflavanone (2) | 235 | 4.18 | 273 | 4.19 | 310 | 3.89 |
| 3′,4′-Dihydroxy-7-methoxyflavanone (3) | 238 | 4.25 | 272 | 4.39 | 335 | 4.01 |
| 2,4-cis-7-Hydroxyflavan-4-ol (4) | 220 | 3.95 | 282 | 4.20 | — | — |
| 2,4-trans-5,7-Dihydroxyflavan-4-ol (5) | 237 | 4.08 | 284 | 4.46 | — | — |
| 7-Hydroxyflavone (6) | 254 | 4.32 | 302 | 4.34 | — | — |