کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1223418 | 967890 | 2009 | 13 صفحه PDF | دانلود رایگان |
Simultaneous characterization of quaternary alkaloids, 8-oxoprotoberberine alkaloids, and a steroid compound in Coscinium fenestratum was successfully performed by liquid chromatography hybrid ion trap time-of-flight mass spectrometry (LC/IT-TOF MS). A total of 32 compounds, including 2 benzylisoquinoline alkaloids, 3 aporphine alkaloids, 12 quaternary protoberberine alkaloids, 10 8-oxoprotoberberine alkaloids, 3 tetrahydroprotoberberine alkaloids, and a steroid compound were simultaneously separated and characterized by matching the empirical molecular formulae with those published in literature and the multi-stage mass spectrometry (MSn) data obtained using structural information from IT, accurate mass measurement obtained from TOF MS, and HPLC separation. A total of 20 compounds, including 4 novel natural products were identified or tentatively identified for the first time from Coscinium fenestratum. In the positive-ion mode, 8-oxoprotoberberines produced [M + H]+ and [M + Na]+; the fragmentation of 8-oxodihydroprotoberberines produced [M + H–CH3] +, [M + H–CH3–CH3]+, and [M + H–CH3–CH3–CO]+, while 8-oxotetrahydroprotoberberines generated [M + H–CH3]+, [M + H–CH3–CH3]+, [M + H–CH3–H]+, and iminium ions from the cleavage of the protoberberine skeleton. The method can be applied for the analysis of 8-oxoberberine and other alkaloids in Coptis japonica, Phellodendron amurense, and other herbal medicines.
Journal: Journal of Pharmaceutical and Biomedical Analysis - Volume 50, Issue 3, 15 October 2009, Pages 413–425