Initial implementation of external accumulation liquid chromatography/electrospray ionization fourier transform ion cyclotron resonance with automated gain control

Mikhail E. Belov, Vsevolod S. Rakov, Eugene N. Nikolaev, Michael B. Goshe, Gordon A. Anderson, Richard D. Smith

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

Capillary liquid chromatography (LC) separation coupled with external accumulation Fourier transform ion cyclotron resonance (FTICR) mass spectrometry has recently been demonstrated to have significant potential for proteomics research. Accumulation of an excessive space charge external to the FTICR cell ion trap has been shown to result in increased mass measurement error, undesirable ion discrimination and/or fragmentation, potentially causing misrepresentation or incorrect assignments of lower abundance peptides in the acquired mass spectra. In this work we report on the capability of data-dependent adjustment of ion accumulation times in the course of LC separations, further referred to as automated gain control (AGC). Three different AGC approaches were evaluated based on the number of putative peptides from a tryptic digest of four casein proteins detected in the course of LC/FTICR separations. When compared with the conventional technique, AGC was found to increase, up to a factor of 3, the total number of peptides identified.

Original languageEnglish
Pages (from-to)627-636
Number of pages10
JournalRapid Communications in Mass Spectrometry
Volume17
Issue number7
DOIs
Publication statusPublished - 2003
Externally publishedYes

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