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Updated: Jun 11, 2025

Atmospheric-pressure Molecular Imaging of Biological Tissues and Biofilms by LAESI Mass Spectrometry
Published on: September 3, 2010
Liquid Atmospheric Pressure Matrix-Assisted Laser Desorption/Ionization Mass Spectrometry Using a Commercial Ion
Bob Challen1, Lily R Adair1, Rainer Cramer1
1Department of Chemistry, University of Reading, Whiteknights, Reading, RG6 6DX, U.K.
A new liquid atmospheric pressure-matrix-assisted laser desorption/ionization (LAP-MALDI) method enables electrospray ionization-like mass spectra acquisition using commercial mass spectrometry equipment. This technique enhances bacterial proteoform and species identification with high resolution and mass accuracy.
Area of Science:
- Analytical Chemistry
- Mass Spectrometry
- Biochemistry
Background:
- Atmospheric pressure-matrix-assisted laser desorption/ionization (AP-MALDI) is a versatile ionization technique.
- Previous LAP-MALDI applications required specialized, non-commercial instrumentation.
- High-resolution mass analyzers offer enhanced analytical capabilities.
Purpose of the Study:
- To develop and apply a liquid atmospheric pressure-matrix-assisted laser desorption/ionization (LAP-MALDI) method.
- To demonstrate the compatibility of LAP-MALDI with commercial mass spectrometry equipment.
- To evaluate the performance of LAP-MALDI on a hybrid orbitrap mass analyzer for protein analysis.
Main Methods:
- A liquid atmospheric pressure-matrix-assisted laser desorption/ionization (LAP-MALDI) method was implemented.
- The method was applied to a commercial atmospheric pressure-matrix-assisted laser desorption/ionization (AP-MALDI) source.
- Data were acquired using a hybrid orbitrap mass analyzer.
Main Results:
- Electrospray ionization (ESI)-like mass spectra of peptides and proteins were successfully obtained.
- Multiply charged peptide ions were recorded with high resolution (~100,000) and mass accuracy (<5 ppm).
- The orbitrap analyzer provided superior performance compared to previous Q-TOF instrumentation.
Conclusions:
- The developed LAP-MALDI method is compatible with commercial mass spectrometry hardware.
- High-resolution orbitrap mass analysis enables confident bacterial proteoform and species identification.
- This advancement simplifies and improves the application of LAP-MALDI in proteomics.
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