on 11-14-201407:34 AM - edited on 10-15-202111:36 AM by AnalyteGuru
Sun L, Hebert AS, Yan X, Zhao Y, Westphall MS, Rush MJ, Zhu G, Champion MM, Coon JJ, Dovichi NJ. Angew Chem Int Ed Engl. 2014 Oct 24. doi: 10.1002/anie.201409075. Capillary zone electrophoresis (CZE)-tandem mass spectrometry (MS/MS) has recently attracted attention as a tool for shotgun proteomics. However, its performance for this analysis has so far fallen far below that of reversed-phase liquid chromatography (RPLC)-MS/MS. The use of a CZE method with a wide separation window (up to 90 min) and high peak capacity (ca. 300) is reported. This method was coupled to an Orbitrap Fusion mass spectrometer through an electrokinetically pumped sheath-flow interface for the analysis of complex proteome digests. Single-shot CZE-MS/MS lead to the identification of over 10 000 peptides and 2100 proteins from a HeLa cell proteome digest in approximately 100 min. This performance is nearly an order of magnitude better than earlier CZE studies and is within a factor of two to four of the state-of-the-art nano ultrahigh-pressure LC system.