Quantitative Multiple Reaction Monitoring of Peptide Abundance

Jun 11, 2012 - Protein Analysis by Shotgun/Bottom-up Proteomics ... Time Tagging for Liquid-Chromatography-Based Shotgun Proteomics of Low Nanogram ...
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Article pubs.acs.org/ac

Quantitative Multiple Reaction Monitoring of Peptide Abundance Introduced via a Capillary Zone Electrophoresis−Electrospray Interface Yihan Li,† Roza Wojcik,†,‡ Norman J. Dovichi,† and Matthew M. Champion*,† †

Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States S Supporting Information *

ABSTRACT: We demonstrate the use of capillary zone electrophoresis with an electrokinetic sheath-flow electrospray interface coupled to a triple-quadrupole mass spectrometer for the accurate and precise quantification of Leu-enkephalin in a complex mixture using multiple-reaction monitoring (MRM). Assay time is