加压毛细管电色谱(pCEC)具有电泳和液相色谱的双重分离机理,其柱效高、选择性强、分辨率高和分离速度快并可进行梯度洗脱.我们在此基础上加入离子交换色谱模式,构建了强阳离子交换-反相加压毛细管液相色谱(micro strong cation exchange liquid chromatography/reversed phase pressurized capillary electrochromatography,μ-SCXLC/RP-pCEC)二维系统,并对中药黄柏的提取物进行了优化分离.第一维μ-SCXLC采用线性盐梯度分离,样品被切割成11个馏分洗脱收集后进入第二维,第二维脱盐后,采用RP-pCEC进行分离分析,梯度洗脱.以中药黄柏提取物为样品,此二维系统的分辨率和峰容量都较一维系统有很大提高,理论峰容量可达900左右,证明构建的二维体系非常适合复杂样品的分离分析.
Pressurized capillary electrochromatography (pCEC) combines capillary electrophoresis (CE) with high performance liquid chromatography (HPLC),resulting in high separation efficiency,high selectivity,high resolution and fast speed.In addition,it provides a solvent gradient capability.Based on pCEC,a two-dimensional chromatography was constructed using micro strong cation exchange liquid chromatography and reversed phase pressurized capillary electrochromatography (μ-SCXLC/RP-pCEC) for the analysis of Cortex Phellodendri extract.A sample was separated by the first dimensional SCX column with a linear salt gradient elution into 11 plugs.Each plug was collected and injected into the second dimensional RP-pCEC column with a linear gradient for further separation.Compared with one-dimensional liquid chromatography,it has higher resolution and larger peak capacity.The two-dimensional chromatographic system is suitable for the separation and analysis of complex samples.
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