4 rezultatima
A high-performance liquid chromatographic-mass spectrometric method was developed for the simultaneous determination of 10 flavonoids in Viscum coloratum obtained from different host species and different sources. Viscum coloratum was extracted with 50% methanol. The extracts were separated on a
From the ethanol extract of Viscum coloratum (Kom.) Nakai, a new flavonoid has been isolated. Based on chemical and spectroscopic analysis, the structure of VII has been elucidated as rhamnazin-3-0-beta-D-apisoyl-(1----2)-[6"-O-(3-hydroxy-3- methylglutarate)]- glucoside and named Viscumneoside VII.
A simple, specific, and sensitive ultra high performance liquid chromatography with tandem mass spectrometry method was developed and validated for the simultaneous quantification of nine compounds including a new compound,
Two new flavonoid glycosides, (2S)-5-hydroxy-7, 3'-dimethoxyflavanone-4'-O-beta-[apiosyl (1 --> 2)]glucoside (1) and rhamnazin-4'-O-beta-[apiosyl (1 --> 2)]glucoside (2) were isolated from Viscum alniformosanae. Structures were elucidated by NMR and mass spectroscopic analysis.