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Related Concept Videos

Matrix-Assisted Laser Desorption Ionization (MALDI)01:08

Matrix-Assisted Laser Desorption Ionization (MALDI)

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Matrix-assisted laser desorption ionization (MALDI) is a powerful analytical technique used in mass spectrometry. It enables the identification and characterization of various biomolecules, including proteins, peptides, nucleic acids, and carbohydrates. MALDI spectrometry is widely employed in biological and medical research, as well as in fields like pharmacology and biochemistry.
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Electrospray Ionization (ESI) Mass Spectrometry01:12

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This lesson details the instrumentation of a mass spectrometer—a physical instrument to perform mass spectrometry on analyte molecules and record the characteristic mass spectra. This is achieved via three chief functions:
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Inductively Coupled Plasma–Mass Spectrometry (ICP–MS): Overview01:19

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In inductively coupled plasma–mass spectrometry (ICP–MS), an inductively coupled plasma (ICP) torch is used as an atomizer and ionizer. Solid samples are dissolved and volatilized before being introduced into the high-temperature argon plasma, while solution samples are nebulized and passed through the high-temperature argon plasma. Plasma dissociates the analytes and ionizes their component atoms to form a mixture of positive ions and molecular species. The positive ions are then...
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The molecular ion peak of a molecule in the mass spectrum provides vital information for molecular identification. However, conventional electron impact ionization can lead to the rapid dissociation of some molecular ions before they reach the detector. A milder ionization method is required to increase the lifetime of such ionized analyte molecules. Chemical ionization (CI) is a gas-phase protonation reaction useful for mass-analyzing analyte molecules that are easily protonated to yield the...
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Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
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Related Experiment Video

Updated: Oct 10, 2025

Whole-body Mass Spectrometry Imaging by Infrared Matrix-assisted Laser Desorption Electrospray Ionization IR-MALDESI
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Whole-body Mass Spectrometry Imaging by Infrared Matrix-assisted Laser Desorption Electrospray Ionization IR-MALDESI

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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
PubMed
Summary
This summary is machine-generated.

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.

Keywords:
CholesterolGoldImaging MSLaser desorption ionizationMetal sputterNeutral lipidsSALDISilverSpinal cord

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Imaging of Biological Tissues by Desorption Electrospray Ionization Mass Spectrometry
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Imaging of Biological Tissues by Desorption Electrospray Ionization Mass Spectrometry

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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.