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Mass Spectrometry: Overview01:19

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Mass spectrometry is an analytical technique used to determine the molecular mass and molecular formula of a compound. The basic principle of mass spectrometry is to generate ions from the analyte molecule and measure these ion abundances against their molecular mass. One common type of ionization, known as electron ionization or EI, bombards the analyte molecules in the gas phase with high-energy electron beams. The electron beams displace an electron from the molecule and leave behind a...
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Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
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Most elements exist in nature as a mixture of isotopes. The isotopes differ in weight due to their respective number of neutrons. The molecular weight of a molecule is different depending on the specific isotope of its elements involved. As a result, the mass spectrum of the molecule exhibits peaks from the same fragment at multiple positions. The positions of these mass signals depend on the mass differences between isotopes. Furthermore, the intensity of these signals is dependent on the...
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In mass spectroscopy, amines undergo fragmentation to give parent ions with odd molecule weights. This observed mass spectrum follows the nitrogen rule; a molecule with an odd number of nitrogen atoms produces a molecular ion with an odd molecular weight. Amines undergo fragmentation through α cleavage, producing nitrogen-containing cations—iminium ions—and alkyl radicals. Mass spectra of aromatic and cyclic aliphatic amines exhibit strong molecular ion peaks, but acyclic...
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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-Based Proteomics.

Marcos Rafael Di Falco1

  • 1Centre for Structural and Functional Genomics, Concordia University, Montreal, QC, Canada. marcos.difalco@concordia.ca.

Methods in Molecular Biology (Clifton, N.J.)
|June 8, 2018
PubMed
Summary
This summary is machine-generated.

This study details protocols for fungal protein sample preparation for mass spectrometry-based proteomics. It covers sample cleanup, digestion, and analysis for high-throughput protein identification.

Keywords:
Database searchFungal proteomeIn-gel digestionIn-solution digestionLC-MS/MSMicrocapillary column packing

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Analytical Chemistry

Background:

  • Proteomics enables large-scale protein analysis using modern mass spectrometry.
  • High-throughput methods identify thousands of peptides and proteins rapidly.

Purpose of the Study:

  • To describe standardized protocols for fungal protein sample preparation for mass spectrometry.
  • To facilitate reproducible and efficient proteomics studies in fungi.

Main Methods:

  • Fungal culture protein sample preparation
  • Protein sample cleanup techniques
  • Proteolytic digestion protocols
  • Liquid chromatography-tandem mass spectrometry (LC-MS/MS) separation
  • Database searching for protein identification

Main Results:

  • Established a comprehensive workflow for fungal proteomics sample preparation.
  • Demonstrated the applicability of the protocols for high-throughput analysis.
  • Enabled identification of numerous fungal proteins via mass spectrometry.

Conclusions:

  • The described protocols provide a robust framework for fungal proteomics.
  • These methods support large-scale protein identification and characterization in fungi.
  • Standardized sample preparation is crucial for accurate and efficient proteomics research.