Several flavonols have been transformed upon treatment by Trametes versicolor laccase. Most of the major oxidation products have been isolated by HPLC as pure compounds and their structures have been, when possible, investigated through spectral methods (HPLC–MS and NMR). The results are coherent with the predominance of a dismutation process, leading to cation formation, over direct radical–radical
The invention relates to novel compositions, in particular cosmetic and/or pharmaceutical compositions or food supplements, comprising at least one oxidised flavonoid derivative of the formula I, to novel oxidised flavonoid derivatives, and to novel uses of the oxidised flavonoid derivatives.
US7867993B2
申请人:——
公开号:US7867993B2
公开(公告)日:2011-01-11
Copper(II)-catalysed oxidation of quercetin and 3-hydroxyflavone
作者:Masanori Utaka、Akira Takeda
DOI:10.1039/c39850001824
日期:——
Quercetin and 3-hydroxyflavone are oxidized to the corresponding 2-alkoxyflavan-3,4-diones by CuCl2 catalysis in MeOH or EtOH under oxygen or nitrogen, the mechanism of which is proposed.