基于液质联用数据库技术的中药及天然产物化学成分快速鉴定方法的建立

目的:应用液质联用数据库技术建立中药及天然产物化学成分的快速鉴定方法。方法:采用超高效液相色谱电喷雾离子化四级杆飞行时间串联质谱(UPLC-ESI-Q-TOF)技术,采集不同类型中药及天然产物化学成分的保留时间和质谱信息并建立质谱信息库,应用Masslynx工作站的Chromalynx XS模块的Identify功能,自动快速鉴定色谱图中各个色谱峰;运用保留时间校正方法,对相同化合物在不同色谱系统下的保留时间进行校正,以扩大该方法适应性。结果:该方法中建立的质谱信息库现收录了包含生物碱类、黄酮类、醌类、苯丙素类、萜类等不同类型的210余个化学成分的液质联用信息,包括正负离子模式下各成分的保留时间,准分子离子峰及其碎片离子的精确质量数。使用该方法进行样品成分鉴定测试,检出准确率90%左右。结论:与人工成分鉴定相比较,该方法简便、快捷、准确率高。保留时间校正方法的应用,一定程度上解决了不同色谱系统下保留时间不同导致质谱库无法统一的问题,扩大了本方法的应用范围。

Construction of a rapid identification method for chemical constituents in traditional Chinese medicine based on liquid chromatography- hybrid mass spectrometry-database

To establish a rapid component identification method for chemical constituents contained in traditional Chinese medicines and natural products by using liquid chromatography-mass spectrometry database technology.Method: Ultra-high performance liquid chromatography electrospray ionization quadrupole time-of-flight mass spectrometry (UPLC-Q-TOF-MS) was applied to collect the retention time and mass spectrum data of chemical constituents contained in traditional Chinese medicines and natural products, and establish a mass spectrum database. The Identify function from Chromalynx XS module in Masslynx workstation was applied to identifiy each chromatographic peak in an automatic and rapid manner. The retention time correction method was used to correct the retention time of identical compounds in different chromatographic systems, in order to improve the adaptability of the method.Result: Currently, the UPLC-MS library contains LC-MS information of more than 210 such chemical constituents as alkaloids, flavonoids, quinones, phenylpropanoids and terpenes, including retention times, xact molecular weights of quasi-molecular ion peaks and their fragment ions under positive and negative modes, respectively. The detection rate of identifying samples by suing the method was around 90%.Conclusion: Compared with manual identification, the method is simple, rapid and highly accurate. The usage of the linear correction for retention times helps solve the disunity of mass spectrum databases caused by different retention times in different chromatographic systems to a certain extent, and expand the application range of the method.