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Updated: Oct 10, 2025
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Whole-body Mass Spectrometry Imaging by Infrared Matrix-assisted Laser Desorption Electrospray Ionization IR-MALDESI
Published on: March 24, 2016
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Metal-Assisted Laser Desorption Ionization Imaging Mass Spectrometry
Frédéric Fournelle1, Pierre Chaurand2
1Department of Chemistry, Université de Montréal, Montreal, QC, Canada.
Methods in Molecular Biology (Clifton, N.J.)
|December 13, 2021
Summary
Metal-assisted laser desorption ionization (LDI) improves molecular imaging by overcoming matrix issues in traditional MALDI. This technique enhances detection of lipids in tissues with high spatial resolution and low background.
Area of Science:
- Analytical Chemistry
- Biotechnology
- Mass Spectrometry Imaging
Background:
- Matrix-assisted laser desorption ionization (MALDI) is a standard for molecular imaging in tissues.
- Traditional MALDI-IMS faces challenges with matrix homogeneity and high background signals in the low mass range.
Purpose of the Study:
- To present metal-assisted laser desorption ionization (LDI) as an improved workflow for molecular imaging.
- To demonstrate the application of silver and gold metal-assisted LDI-IMS for analyzing neutral lipids in tissue sections.
Main Methods:
- Utilized silver and gold metal deposition for metal-assisted LDI-IMS.
- Analyzed spinal cord and kidney thin tissue sections.
- Detailed step-by-step workflows for the metal-assisted LDI-IMS method.
Main Results:
- Metal-assisted LDI-IMS effectively ionizes low molecular weight compounds.
- Achieved very high spatial resolutions with significantly reduced background signals in the low mass range.
- Successfully detected neutral lipids, including cholesterol, free fatty acids, and triglycerides.
Conclusions:
- Metal-assisted LDI-IMS offers a superior alternative to traditional MALDI for molecular imaging.
- The method provides enhanced sensitivity and resolution for lipid analysis in biological tissues.
- This technique holds significant potential for advancing molecular imaging applications.
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