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Related Concept Videos

MALDI-TOF Mass Spectrometry01:19

MALDI-TOF Mass Spectrometry

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...
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...
Peptide Identification Using Tandem Mass Spectrometry01:33

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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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Dithranol as a Matrix for Matrix Assisted Laser Desorption/Ionization Imaging on a Fourier Transform Ion Cyclotron Resonance Mass Spectrometer
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Liquid chromatography MALDI MS/MS for membrane proteome analysis.

Nan Wang1, J Bryce Young, Liang Li

  • 1Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada.

Methods in Molecular Biology (Clifton, N.J.)
|January 21, 2009
PubMed
Summary
This summary is machine-generated.

This study presents a method combining liquid chromatography with matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) for protein identification. It details membrane protein solubilization, digestion, and LC eluate deposition for MALDI-MS/MS analysis.

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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:

  • Proteomics
  • Analytical Chemistry
  • Mass Spectrometry

Background:

  • Liquid chromatography (LC) coupled with matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) enables protein identification.
  • Tandem mass spectrometry (MS/MS) generates peptide ion spectra for database searching.
  • Efficient sample preparation is crucial for successful MALDI-MS analysis of complex proteomes.

Purpose of the Study:

  • To present a protocol for sequential solubilization and digestion of membrane proteins.
  • To describe the process of LC eluate deposition onto a MALDI plate for automated analysis.
  • To discuss practical considerations and spectral acquisition for MALDI-MS/MS protein identification.

Main Methods:

  • Sequential solubilization and digestion of membrane proteins using methanol, SDS, and microwave-assisted acid hydrolysis.
  • Automated off-line fraction collection of LC eluates onto a MALDI plate.
  • MALDI-MS and MS/MS spectral acquisition and database searching for protein identification.

Main Results:

  • A detailed protocol for preparing membrane proteins for LC-MALDI-MS/MS analysis.
  • Practical guidelines for optimizing LC eluate deposition onto MALDI plates.
  • Discussion of spectral acquisition and database searching strategies for accurate protein identification.

Conclusions:

  • The presented protocol facilitates the identification of membrane proteins using LC-MALDI-MS/MS.
  • Optimized eluate deposition and spectral analysis are key to reliable protein identification.
  • This approach enhances the capabilities of proteomic analysis for complex biological samples.