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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.
The analyte of interest, a biomolecule or a mixture of biomolecules, is mixed with a suitable matrix material. The...
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Mass Spectrometry: Complex Analysis01:21

Mass Spectrometry: Complex Analysis

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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.
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
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MALDI-TOF Mass Spectrometry01:19

MALDI-TOF Mass Spectrometry

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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.
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Peptide Identification Using Tandem Mass Spectrometry01:33

Peptide Identification Using Tandem Mass Spectrometry

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Tandem mass spectrometry, also known as MS/MS or MS2, is an analytical technique that employs two mass analyzers. Essentially it is a series of mass spectrometers that helps isolate a particular biomolecule and then helps study its chemical properties.
This technique helps gather information regarding the protein from which the peptide was obtained and to study the peptides’ amino acid sequence. Identifying peptides from a complex mixture is an important component of the growing field of...
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Gas Chromatography–Mass Spectrometry (GC–MS)01:14

Gas Chromatography–Mass Spectrometry (GC–MS)

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Gas chromatography–mass spectrometry (GC–MS) is the combination of analytical techniques of gas chromatography and mass spectrometry in a single instrument for analyzing a mixture of compounds. The gas chromatograph separates the compounds in the mixture, and the mass spectrometer analyzes each compound separately to determine the molecular masses and molecular structures.
A gas chromatograph consists of a long, narrow capillary column with a polysiloxane coating on the inner wall....
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Mass Spectrometers01:16

Mass Spectrometers

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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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Related Experiment Video

Updated: Jul 24, 2025

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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Gel-assisted mass spectrometry imaging.

Yat Ho Chan1, Koralege C Pathmasiri1, Dominick Pierre-Jacques1

  • 1Department of Chemistry, University of Illinois Chicago; Chicago, IL 60607, USA.

Biorxiv : the Preprint Server for Biology
|July 3, 2023
PubMed
Summary

Mass spectrometry imaging (MSI) resolution is enhanced using a novel hydrogel method (GAMSI). This technique improves spatial omics for cellular and subcellular analysis without new hardware.

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Last Updated: Jul 24, 2025

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

  • Biomedical imaging
  • Analytical chemistry
  • Molecular biology

Background:

  • Mass spectrometry imaging (MSI) enables label-free spatial analysis of biomolecules in specimens.
  • Current MSI spatial resolution limits hinder single-cell and subcellular investigations.
  • Existing methods face physical and instrumental constraints impacting resolution.

Approach:

  • Developed Gel-Assisted Mass Spectrometry Imaging (GAMSI), a novel workflow for MSI sample preparation.
  • Utilizes the reversible interaction of analytes with superabsorbent hydrogels to enhance spatial resolution.
  • GAMSI is compatible with existing mass spectrometry hardware and analysis pipelines.

Key Points:

  • GAMSI significantly enhances the spatial resolution of lipid and protein MALDI-MSI.
  • Achieves severalfold improvement in spatial resolution.
  • Maintains compatibility with current MSI instrumentation and data analysis.

Conclusions:

  • GAMSI overcomes the spatial resolution limitations of conventional MSI.
  • Enables (sub)cellular-scale MALDI-MSI-based spatial omics.
  • Increases the accessibility of high-resolution MSI for diverse biological studies.