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Mass spectrometry imaging with laser-induced postionization.

Jens Soltwisch1, Hans Kettling2, Simeon Vens-Cappell2

  • 1Institute for Hygiene, University of Münster, Robert-Koch-Strasse 41, 48149 Münster, Germany.

Science (New York, N.Y.)
|March 7, 2015
PubMed
Summary
This summary is machine-generated.

This study introduces a secondary ionization technique to significantly boost sensitivity in matrix-assisted laser desorption/ionization mass spectrometry imaging (MALDI-MSI). This method enhances the detection of various biomolecules in tissues, improving imaging capabilities.

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Area of Science:

  • Analytical Chemistry
  • Biotechnology
  • Mass Spectrometry Imaging

Background:

  • Matrix-assisted laser desorption/ionization mass spectrometry imaging (MALDI-MSI) is a powerful tool for mapping biomolecules in tissues.
  • Current MALDI-MSI methods face limitations in sensitivity due to restricted ionization efficiency.
  • Low ionization yields hinder the comprehensive analysis of diverse biomolecule classes.

Purpose of the Study:

  • To develop a novel postionization method to enhance ion yields in MALDI-MSI.
  • To improve the sensitivity and detection capabilities for lipids, vitamins, and saccharides.
  • To achieve high lateral resolution imaging with increased sensitivity.

Main Methods:

  • Utilized a wavelength-tunable postionization laser to induce secondary MALDI-like ionization in the gas phase.
  • Applied the technique to analyze animal and plant tissue samples.
  • Investigated critical parameters including cooling gas pressure, laser wavelength, pulse energy, and inter-pulse delay.

Main Results:

  • Achieved up to a two-orders-of-magnitude increase in ion yields for lipids, liposoluble vitamins, and saccharides.
  • Demonstrated successful imaging with a 5-micrometer laser spot size.
  • Identified key parameters crucial for optimizing the secondary ionization process.

Conclusions:

  • The developed postionization laser technique significantly enhances MALDI-MSI sensitivity.
  • This advancement enables more comprehensive biomolecular distribution analysis in tissues.
  • The method holds potential for sensitive MALDI-MS imaging at low micrometer lateral resolution.