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MALDI-Mass Spectrometric Imaging for the Investigation of Metabolites in Medicago truncatula Root Nodules
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Methodologies for the airbrush application of MALDI matrices.

Alexander D Warren1, David J Mitchell2, Paul J Gates1

  • 11 School of Chemistry, University of Bristol, Cantock's Close, Bristol, UK.

European Journal of Mass Spectrometry (Chichester, England)
|January 17, 2018
PubMed
Summary

Airbrushing offers a robust method for matrix deposition in matrix-assisted laser desorption/ionisation mass spectrometry (MALDI-MS). This technique enhances sample homogeneity, improving analytical performance compared to traditional pipette methods.

Keywords:
Matrix-assisted laser desorptionairbrushcolloidal graphitematrixtraditional matrices

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Area of Science:

  • Analytical Chemistry
  • Mass Spectrometry

Background:

  • Developing reliable matrix deposition methods is crucial for matrix-assisted laser desorption/ionisation mass spectrometry (MALDI-MS).
  • Current methods often lack robustness and applicability across diverse matrices, solvents, and analyte types.

Purpose of the Study:

  • To present a robust airbrush methodology for matrix deposition in MALDI-MS.
  • To investigate the impact of airbrush parameters on matrix application and analytical performance.
  • To compare airbrush deposition with standard pipette deposition techniques.

Main Methods:

  • Utilizing an airbrush for uniform matrix deposition onto sample targets.
  • Analyzing organic analytes and metal salts in positive and negative ion modes.
  • Varying airbrush set-up and parameters to optimize deposition.
  • Comparing results with conventional pipette deposition methods.

Main Results:

  • Airbrush deposition resulted in significantly increased homogeneity of the matrix surface and analyte spots.
  • Enhanced analytical performance was observed with airbrush-deposited matrices compared to pipette deposition.
  • The need for searching for optimal analysis spots (sweat spots) was greatly diminished.
  • Graphite matrices demonstrated superior performance over organic matrices in negative ion mode.

Conclusions:

  • Airbrush application provides a reliable and robust matrix deposition technique for MALDI-MS.
  • This method improves analytical sensitivity and reproducibility by ensuring uniform sample preparation.
  • The airbrush technique offers a significant advancement over traditional deposition methods for various analytes and matrices.