Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1253251 | Chemical Research in Chinese Universities | 2007 | 4 Pages |
Abstract
As a part of the ongoing search for new constituents of Stemona species in China, chemical investigation of Stemona sessilifolia, a plant used in the traditional Chinese medicine to treat respiratory disorders, was carried out. To identify the chemical components rapidly, a selected sample of S. sessilifolia containing bibenzyls was tested using LC-ESIMS and analyzed further using stop-flow LC-UV-NMR, which was sensitive for the detection of the main constituents. LC microfractions were collected using the LC-UV-NMR technique and HR-EIMS off-line analysis was carried out on the collected fractions. This chemical screening strategy allowed for the on-line identification of the main constituents of S. sessilifolia and provided information that was useful for a further peak-guided isolation procedure. Using these methods, four bibenzyls were isolated: two known compounds, 3,5-dihydroxy-4-methyl bibenzyl(1) and 3, 5-dihydroxy-2â²-methoxy-4-methyl bibenzyl (2), and two novel compounds, 3, 3â²-dihydroxy-5, 6â²-dimethoxy bibenzyl (3) and 3,5-dihydroxy-2â²,5â²-dimethoxy bibenzyl (4).
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Chemistry (General)
Authors
YANG Xin-zhou, YANG Yi-ping, TANG Chun-ping, KE Chang-qiang, YE Yang,