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Related Experiment Videos

Compact tunable Cr:LiSAF laser for infrared matrix-assisted laser desorption/ionization

M Sadeghi1, Z Olumee, X Tang

  • 1Department of Chemistry, George Washington University, Washington, D.C. 20052, USA.

Rapid Communications in Mass Spectrometry : RCM
|January 1, 1997
PubMed
Summary

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Mid-infrared matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) using a tunable Cr:LiSAF laser showed excellent signal quality but poor reproducibility. Improved laser stability is expected to enhance shot-to-shot consistency in future MALDI-MS applications.

Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Laser Physics

Background:

  • Matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) is a powerful analytical technique.
  • Mid-infrared laser sources offer unique advantages for MALDI-MS.
  • Cr:LiSAF lasers provide tunable output in the mid-infrared region.

Purpose of the Study:

  • To investigate the use of a tunable Cr:LiSAF laser-pumped optical parametric oscillator for mid-infrared MALDI-MS.
  • To evaluate the performance of this system for analyzing biomolecules and synthetic polymers.
  • To assess the signal quality and reproducibility of the MALDI-MS experiments.

Main Methods:

  • Utilized a tunable Cr:LiSAF laser-pumped optical parametric oscillator.
  • Performed mid-infrared MALDI-MS experiments on substance P, bovine insulin, and pd(T)10.

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  • Analyzed mass spectra in the 2.88-2.96 microns wavelength range.
  • Assessed signal-to-noise ratio, resolution, and shot-to-shot reproducibility.

    • Main Results:

    • Achieved excellent single-shot signal quality, including high signal-to-noise ratio and resolution.
    • Observed poor shot-to-shot reproducibility in the MALDI-MS experiments.
    • Found no correlation between the absorption spectrum of the matrix and the MALDI response.

    Conclusions:

    • A tunable Cr:LiSAF laser is suitable for mid-infrared MALDI-MS, providing high-quality individual spectra.
    • Shot-to-shot reproducibility requires further optimization, likely through laser design improvements.
    • The matrix absorption spectrum does not appear to be a limiting factor for MALDI response in this setup.