title: Two-dimensional LC-MS analysis of components in Swertia franchetiana Smith.
abstract: An off-line 2-D-LC approach was developed for the separation and identification of components in extracts of Swertia franchetiana Smith, which is a traditional Chinese medicine. An octadecylsilica column was used for further separation of fractions from a cyano column with UV and MS detection. In this method, a longer column was used in the second dimension to improve the separation ability, and "on-column focusing" was adopted to reduce sample loss and pollution on concentrating the fractions from the first dimension. More than 118 and 575 components were detected in the chloroform and n-butanol extracts by this method, respectively. In contrast, only 20 and 95 peaks were detected by the one-dimensional method. Most of the additionally detected compounds were of low-abundance components. Many compounds can be preliminarily identified according to their UV and mass spectra in the two-dimensional method. The obtained results not only demonstrated the powerful resolution of 2-D-LC, but also led to in-depth comprehension of the UV and mass spectra of complex samples.
authors.affiliation: Dalian Institute of Chemical Physics, Graduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences, Dalian, PR China.
authors.forename: Yanming
authors.initials: Y
authors.lastname: Liu
authors.forename: Qing
authors.initials: Q
authors.lastname: Xu
authors.forename: Xingya
authors.initials: X
authors.lastname: Xue
authors.forename: Feifang
authors.initials: F
authors.lastname: Zhang
authors.forename: Xinmiao
authors.initials: X
authors.lastname: Liang
mesh_terms: D002725:Chloroform; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D013058:Mass Spectrometry / Q000379:methods*; D010936:Plant Extracts / Q000032:analysis* / Q000737:chemistry*; D029967:Swertia / Q000737:chemistry* / Q000145:classification*
chemical_list: D010936:Plant Extracts; D002725:Chloroform