Table 4: UV absorption of 7-hydroxyflavanone (1) and its biotransformation products (2 ÷ 6).

Compound1st band2nd band3rd band
𝜆 m a x [nm]log ε 𝜆 m a x [nm]log ε 𝜆 m a x [nm]log ε

7-Hydroxyflavanone (1)2374.152754.183103.95
7-Methoxyflavanone (2)2354.182734.193103.89
3′,4′-Dihydroxy-7-methoxyflavanone (3)2384.252724.393354.01
2,4-cis-7-Hydroxyflavan-4-ol (4)2203.952824.20
2,4-trans-5,7-Dihydroxyflavan-4-ol (5)2374.082844.46
7-Hydroxyflavone (6)2544.323024.34