Improvement of interface in comprehensive two-dimensional liquid chromatography and its application in the research of proteomics
二维液相色谱接口的改进及其在蛋白质组学研究中的应用

A two-dimensional liquid chromatography (2D-LC) system was constructed with improved trap column interface. Weak anion exchange (WAX) LC was used as the first dimension separation mode and reversed-phase (RP) LC as the second dimension. Two 35 mm long columns (column 1 and column 2) were used as trap columns to retain the fraction from the first dimension, and forward-flushing was employed to pre-separate the components when the trap column was connected to the second dimension. The interface greatly increases the efficiency of the second dimension column without losing the separation speed. Rat serum sample was separated on this system to evaluate the performance of the constructed system. The viscous fingering (VF) phenomenon was generated attribute to the difference in the velocities of the mobile phases of the two dimensions. The separation efficiency was theoretically increased by 70% when the 35 mm trap columns were used in the forward-flush mode.