Improved mass accuracy for higher mass peptides by using SWIFT excitation for MALDI-FTICR mass spectrometry
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  • 作者:Li Jing (1)
    Chunyan Li (1)
    Richard L. Wong (2)
    Desmond A. Kaplan (3)
    I. Jonathan Amster (1)
  • 刊名:Journal of The American Society for Mass Spectrometry
  • 出版年:2008
  • 出版时间:January 2008
  • 年:2008
  • 卷:19
  • 期:1
  • 页码:76-81
  • 全文大小:170KB
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  • 作者单位:Li Jing (1)
    Chunyan Li (1)
    Richard L. Wong (2)
    Desmond A. Kaplan (3)
    I. Jonathan Amster (1)

    1. Department of Chemistry, University of Georgia, 30602, Athens, Georgia, USA
    2. Bristol-Myers Squibb, Hopewell, New Jersey, USA
    3. Bruker Daltonics, Billerica, Massachusetts, USA
文摘
Stepwise-external calibration has previously been shown to produce sub part-per-million (ppm) mass accuracy for the MALDI-FTICR/MS analyses of peptides up to m/z 2500. The present work extends these results to ions up to m/z 4000. Mass measurement errors for ions of higher mass-to-charge are larger than for ions below m/z 2500 when using conventional chirp excitation to detect ions. Mass accuracy obtained by using stored waveform inverse Fourier transform (SWIFT) excitation was evaluated and compared with chirp excitation. Analysis of measurement errors reveals that SWIFT excitation provides smaller deviations from the calibration equation and better mass accuracy than chirp excitation for a wide mass range and for widely varying ion populations.

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