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Tandem Mass Spectrometry01:21

Tandem Mass Spectrometry

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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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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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Mass Spectrum: Interpretation01:24

Mass Spectrum: Interpretation

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An unknown compound can be established by identifying the molecular ion peak in the mass spectrum. The molecular ion peak is often weak or absent due to the predominance of fragmentation in high-energy electron beams. In such cases, a soft-energy electron beam can be used to scan the spectrum to enhance the intensity of the molecular ion peak. Additionally, chemical ionization, field ionization, and desorption ionization spectra are used to obtain a relatively intense molecular ion peak.To...
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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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High-Resolution Mass Spectrometry (HRMS)01:15

High-Resolution Mass Spectrometry (HRMS)

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The resolution of a mass spectrometer depends on the efficiency of separating ions with different ion masses. The mass of an atom is approximated to the sum of the masses of protons and neutrons inside, considering the masses of protons and neutrons as equal. However, the masses of the proton (1.6726 × 10−24 g) and neutron (1.6749 × 10−24 g) are not truly equal. There is a minor error in the expression of atomic masses relative to the simplest atom of hydrogen. For...
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Mass Spectrometry: Amine Fragmentation00:55

Mass Spectrometry: Amine Fragmentation

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Amines can be identified using mass spectroscopy based on their characteristic fragmentation patterns. The molecular ions of amines undergo fragmentation via ⍺-cleavage. The ⍺-cleavage of the carbon-carbon bonds in amines generates an alkyl radical and resonance-stabilized nitrogen-containing cation.
In amines, the number of nitrogen atoms affects the mass of the molecular ion, which is described by the nitrogen rule of mass spectrometry. This rule states that a compound containing...
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Analyzing Large Protein Complexes by Structural Mass Spectrometry
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MS2Analyzer: A software for small molecule substructure annotations from accurate tandem mass spectra.

Yan Ma1, Tobias Kind, Dawei Yang

  • 1UC Davis Genome Center-Metabolomics, University of California , Davis, California 95616, United States.

Analytical Chemistry
|September 30, 2014
PubMed
Summary

MS2Analyzer software aids metabolomics research by analyzing tandem mass spectra (MS/MS) for substructure identification. It accurately annotates common neutral losses in spectra, improving small molecule discovery.

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Area of Science:

  • Metabolomics
  • Computational Chemistry
  • Bioinformatics

Background:

  • Tandem mass spectrometry (MS/MS) data analysis is crucial for metabolomics but is hindered by limited spectral libraries.
  • Existing MS/MS spectral libraries are often incomplete and not freely accessible, limiting small molecule identification.
  • Efficient interpretation of large MS/MS datasets is a significant bottleneck in discovery-driven research.

Purpose of the Study:

  • To develop and validate MS2Analyzer, a freely available software tool for analyzing MS/MS spectra.
  • To enable automated identification of mass spectral features, including neutral losses and ion differences, for substructure annotation.
  • To improve the systematic analysis and interpretation of metabolomics data for enhanced small molecule discovery.

Main Methods:

  • Developed MS2Analyzer for user-defined searches within MSP/MGF MS/MS spectral files.
  • Collected a reference set of 147 literature-reported neutral losses and their corresponding substructures.
  • Validated the software using 19,329 accurate mass MS/MS spectra from the NIST11 library.

Main Results:

  • MS2Analyzer successfully identifies mass spectral features like neutral losses, product ions, and precursor ions.
  • Validation demonstrated high accuracy (92.1 ± 6.4%) in annotating 13 common neutral losses (e.g., acetylations, glycosylations).
  • The tool's utility was proven in analyzing complex lipids within microalgae samples.

Conclusions:

  • MS2Analyzer significantly enhances the systematic analysis of MS/MS spectra in metabolomics.
  • The software facilitates substructure annotation by accurately linking neutral loss features to molecular components.
  • MS2Analyzer is a valuable, freely accessible resource for accelerating small molecule discovery in various research areas.