A sheathless nanoflow electrospray interface for on-line capillary electrophoresis mass spectrometry

George M. Janini*, Thomas P. Conrads, Kenneth L. Wilkens, Haleem J. Issaq, Timothy D. Veenstra

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

88 Scopus citations


A novel, rugged capillary electrophoresis-electrospray ionization (CE-ESI) interface where the separation column, an electrical porous junction, and the spray tip are integrated on a single piece of a fused-silica capillary is described. ESI is accomplished by applying an electrical potential through an easily prepared porous junction across a 3-4-mm length of fused silica. A stable electrospray is produced at nanoflow rates generated in the capillary by electrophoretic and electroosmotic forces. The interface is particularly well suited for the detection of low-femtomole levels of proteins and peptides. The ruggedness of this interface was evident by the continuous operation of the same column for over a 2-week period with no detectable deterioration in separation or electrospray performance. The new interface was used for the LC-ESI-MS separation and analysis of peptides and proteins. Injection of 25 fmol of [Glu1]-fibrinopeptide B using the new device produced a CE-ESI-MS electropherogram with a signal-to-noise ratio of over 100 for this peptide.

Original languageEnglish
Pages (from-to)1615-1619
Number of pages5
JournalAnalytical Chemistry
Issue number7
StatePublished - 1 Apr 2003
Externally publishedYes


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