Pharmaceutical Sciences Faculty Publications
A Sheathless Nanoflow Electrospray Interface for On-Line Capillary Electrophoresis Mass Spectrometry
Document Type
Article
Publication Date
4-1-2003
Journal Title
Analytical Chemistry
ISSN
0003-2700
Volume
75
Issue
7
First Page
1615
Last Page
1619
DOI
10.1021/ac020661+
PubMed ID
12705593
Abstract
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.
Keywords
Amino acid sequence, apoproteins, chromatography, liquid, electrophoresis, capillary, horses, myoglobin, nanotechnology, proteins, spectrometry, mass, electrospray ionization
Recommended Citation
Janini, George M.; Conrads, Thomas P.; Wilkens, Kenneth L.; Issaq, Haleem J.; and Veenstra, Timothy D., "A Sheathless Nanoflow Electrospray Interface for On-Line Capillary Electrophoresis Mass Spectrometry" (2003). Pharmaceutical Sciences Faculty Publications. 504.
https://digitalcommons.cedarville.edu/pharmaceutical_sciences_publications/504
