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Dry Deposition Strategies for MALDI-MS Imaging: Principles, Advances and Emerging Applications.

Toufik Mahamdi1,2, Oscar Yanes1,2,3

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Dry matrix deposition for matrix-assisted laser desorption/ionisation mass spectrometry imaging (MALDI-MSI) minimizes solvent use, enhancing spatial resolution and image quality. This review explores dry deposition strategies and their advantages over traditional wet methods for biomedical research.

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Area of Science:

  • Biomedical Research
  • Analytical Chemistry
  • Molecular Imaging

Background:

  • Matrix-assisted laser desorption/ionisation mass spectrometry imaging (MALDI-MSI) is crucial for spatially resolved molecular analysis in tissues.
  • Matrix deposition is a critical step influencing MALDI-MSI performance, including sensitivity, spatial resolution, and reproducibility.
  • Wet matrix deposition methods often cause analyte delocalisation due to solvent use, limiting spatial fidelity.

Purpose of the Study:

  • To review and summarize dry matrix deposition strategies for MALDI-MSI.
  • To discuss the principles, instrumentation, benefits, and limitations of dry deposition methods.
  • To highlight the increasing importance of dry deposition in high-resolution spatial omics.

Main Methods:

  • Review of existing literature on dry matrix deposition techniques for MALDI-MSI.
  • Analysis of comparative studies evaluating wet versus dry deposition approaches (2023-2025).
  • Examination of principles, instrumentation, and performance impacts of various dry deposition strategies.

Main Results:

  • Dry matrix deposition methods aim to eliminate or minimize solvent use, thereby reducing analyte delocalisation.
  • These methods offer potential improvements in spatial fidelity and image quality compared to traditional wet techniques.
  • Recent comparative studies underscore the benefits of dry deposition for enhanced analytical performance in MALDI-MSI.

Conclusions:

  • Dry matrix deposition is a promising advancement in MALDI-MSI workflows, addressing limitations of wet methods.
  • The adoption of dry deposition is crucial for achieving high-resolution spatial omics.
  • Further research and comparative studies reinforce the value of dry deposition for superior MALDI-MSI outcomes.