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

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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 is an ionization technique, widely employed in biological and medical research, as well as in fields like pharmacology and biochemistry.The analyte of interest, a biomolecule or a mixture of biomolecules, is mixed with a suitable matrix...
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Mass spectrometry is a powerful characterization technique that can identify and separate a wide variety of compounds ranging from chemical to biological entities, based on their mass-to-charge ratio (m/z). The instruments that allow this detection, known as mass spectrometers, have three components: an ion source, a mass analyzer, and a detector. These spectrometers differ based on the nature of their ion source and analyzers.Matrix-assisted laser desorption ionization (MALDI) is a commonly...
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Fluorescence-Guided Matrix-assisted Laser Desorption/Ionization with Laser-Induced Postionization Mass Spectrometry of Individual Rat Neural Cells
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Fluorescence-Guided Matrix-assisted Laser Desorption/Ionization with Laser-Induced Postionization Mass Spectrometry of Individual Rat Neural Cells

Published on: May 23, 2025

Nanoparticle-assisted laser desorption/ionization based mass imaging with cellular resolution.

Shu Taira1, Yuki Sugiura, Shinji Moritake

  • 1Molecular Gerontology Group, Mitsubishi Kagaku Institute of Life Sciences (MITILS), Machida, Tokyo 194-8511, Japan.

Analytical Chemistry
|May 15, 2008
PubMed
Summary

Mass spectrometry imaging (MSI) visualizes molecules in tissues. A new nanoparticle-assisted laser desorption/ionization (nano-PALDI) method improves resolution for lipids and peptides in mammalian tissues.

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Fluorescence-Guided Matrix-assisted Laser Desorption/Ionization with Laser-Induced Postionization Mass Spectrometry of Individual Rat Neural Cells
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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)

Published on: March 24, 2016

Area of Science:

  • Analytical Chemistry
  • Biotechnology
  • Molecular Imaging

Background:

  • Mass spectrometry imaging (MSI) is crucial for analyzing molecular distribution in biological tissues.
  • Existing MSI techniques like MALDI and SIMS have limitations, including reduced spatial resolution and restricted analyte ionization.
  • Matrix crystal size and analyte migration in MALDI, and low molecular weight ionization in SIMS, hinder detailed tissue analysis.

Purpose of the Study:

  • To overcome the limitations of current MSI techniques.
  • To develop an advanced MSI method with enhanced spatial resolution and broader analyte coverage.
  • To visualize the distribution of lipids and peptides in mammalian tissues with high fidelity.

Main Methods:

  • Development and application of nanoparticle-assisted laser desorption/ionization (nano-PALDI) for MSI.
  • Utilized nano-PALDI MSI to analyze molecular distribution in mammalian tissue samples.
  • Achieved high-resolution imaging of specific biomolecules.

Main Results:

  • Successfully visualized the distribution of lipids and peptides in mammalian tissues using nano-PALDI MSI.
  • Achieved a spatial resolution of 15 micrometers, significantly improving upon existing methods.
  • nano-PALDI MSI effectively overcomes the resolution and ionization limitations of MALDI and SIMS.

Conclusions:

  • nano-PALDI-based MSI is a powerful technique for high-resolution molecular imaging in biological tissues.
  • This method enables detailed visualization of lipids and peptides, advancing our understanding of tissue biochemistry.
  • nano-PALDI MSI offers a promising alternative for investigating complex biological systems at the molecular level.