A novel interface for variable flow nanoscale LC/MS/MS for improved proteome coverage.

Journal Article (Journal Article)

A variable flow "peak trapping" liquid chromatography (LC) interface has been developed for the coupling of nanoscale LC to electrospray ionization mass spectrometry (ESI-MS). The presented peak trapping LC interface allows for the extended analysis time of co-eluting compounds and has been employed for the identification of proteins via tandem mass spectrometry (MS/MS). The variable flow process can be controlled either manually or in a completely automated manner where the mass spectrometer status determines the status of the variable flow interface. When the mass spectrometer operates in MS survey mode, the interface is operated in a so-called "high-flow" mode. Alternatively, the interface is operated in a "low-flow" mode during MS/MS analysis. In the "high-flow" mode of the variable flow process the column flow rate is typically around 200 nL/min, whereas in the "low-flow" mode the column effluent is introduced into the source of the mass spectrometer at 25 nL/min. In addition to the flow reduction during MS/MS analysis, the gradient is paused to preserve the peptide separation on the analytical nanoscale LC column. The performance of the variable flow nanoscale LC/MS/MS interface is demonstrated by the automated analysis of standard peptide mixtures and protein digests utilizing variable flow, data-dependent scanning MS/MS techniques, and automated database searching.

Full Text

Duke Authors

Cited Authors

  • Vissers, JPC; Blackburn, RK; Moseley, MA

Published Date

  • July 2002

Published In

Volume / Issue

  • 13 / 7

Start / End Page

  • 760 - 771

PubMed ID

  • 12148801

Pubmed Central ID

  • 12148801

International Standard Serial Number (ISSN)

  • 1044-0305

Digital Object Identifier (DOI)

  • 10.1016/S1044-0305(02)00418-X


  • eng

Conference Location

  • United States