Screening and identification of multi-component in Qingkailing injection using combination of liquid chromatography/time-of-flight mass spectrometry and liquid chromatography/ion trap mass spectrometry.

An approach for screening and identification of multi-component in complex traditional Chinese medicine systems with a combinative LC/MS (MS(n)) technique was described in this paper. The chemical profile of Qingkailing injection, a well-known traditional Chinese formula in China, was studied using the established method as for an application. Benefit from combining the accurate mass measurement of LC/TOF-MS to generate elemental compositions and the complementary multilevel structural information provided by LC/ion trap MS(n), 33 components in Qingkailing injection were identified in all. The three isomers of chlorogenic acid, isochlorogenic acid and neochlorogenic acid which are derived from Flos Lonicerae, one of the medicinal materials in Qingkailing, were differentiated by verifying their MS3 fragmentation data. All the components identified were surveyed and classified according to their medicinal materials derivation. This study is expected to provide an effective and reliable pattern for comprehensive and systematic characterization of the complex traditional Chinese medicine systems.