title: Analysis of anthraquinones in cell cultures of Cinchona 'Robusta' by HPLC with photodiode array and mass spectrometry detection.
abstract: An HPLC-PAD-ESI/MS method has been developed for the analysis of anthraquinones in cell cultures of Cinchona 'Robusta'. Using a C18 column and gradient elution with a mobile phase system containing acetonitrile, water and trifluoroacetic acid, a satisfactory separation of both anthraquinone glycosides and aglycones in a crude dichloromethane extract could be obtained. Robustaquinone B was identified as a major anthraquinone in the extracts, and another five anthraquinones were tentatively identified from spectroscopic data. A number of minor unknown compounds were detected and were distinguished from the known anthraquinones. An isocratic system for the quantitative determination of robustaquinone B has also been developed.
mesh_terms: D000880:Anthraquinones / Q000032:analysis*; D002478:Cells, Cultured; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D002929:Cinchona / Q000737:chemistry*; D013058:Mass Spectrometry / Q000379:methods; D015394:Molecular Structure; D013057:Spectrum Analysis
chemical_list: D000880:Anthraquinones; C450161:robustaquinone B