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Related Concept Videos

Mass Spectrometry: Overview01:19

Mass Spectrometry: Overview

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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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Mass Spectrometry: Molecular Fragmentation Overview01:20

Mass Spectrometry: Molecular Fragmentation Overview

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The ionization of a molecule into a molecular ion inside the mass spectrometer causes instability in the molecule's structure due to the loss of an electron. This eventually leads to the fragmentation or breaking of some bonds in the molecule. The fragmentation occurs predominantly at specific bonds to yield relatively stable fragments.
One type of fragmentation pattern is the cleavage of a single bond in the molecular ion. The cleavage leads to a radical and a cation. The cleavage can occur at...
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Mass Spectrometry of Amines01:15

Mass Spectrometry of Amines

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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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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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Mass Analyzers: Overview01:13

Mass Analyzers: Overview

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The mass analyzer is a crucial component of the mass spectrometer. In the ionization chamber, the vaporized sample is bombarded with a high-energy electron beam to generate a radical cation and further fragment into neutral molecules, radicals, and cations. A series of negatively charged accelerator plates accelerate the cations into the mass analyzer. The mass analyzer separates ions according to their mass-to-charge (m/z) ratios and then directs them to the detector. The common types of mass...
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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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uafR: An R package that automates mass spectrometry data processing.

Chase A Stratton1,2, Yvonne Thompson1, Konilo Zio3

  • 1The Land Institute, Salina, KS, United States of America.

Plos One
|July 5, 2024
PubMed
Summary
This summary is machine-generated.

The uafR package automates gas chromatography-mass spectrometry (GC-MS) data analysis, enabling rapid structural similarity matching and compound identification. This R package significantly improves the speed and accuracy of chemical data interpretation for various research applications.

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Area of Science:

  • Cheminformatics
  • Analytical Chemistry
  • Computational Biology

Background:

  • Chemical data generation is rapidly increasing, outpacing current analysis capabilities.
  • Traditional gas chromatography-mass spectrometry (GC-MS) data interpretation is time-consuming and labor-intensive.
  • There is a need for automated and efficient tools to handle large-scale chemical datasets.

Purpose of the Study:

  • To develop an R package, uafR, for automating GC-MS data retrieval and analysis.
  • To enable rapid structural similarity matching and tentative compound identification.
  • To reduce the time, cost, and effort associated with chemical data interpretation.

Main Methods:

  • Developed the uafR R package integrating cheminformatics workflows.
  • Utilized public chemical databases (e.g., PubChem) for compound identification.
  • Validated the package using purified internal standards and a large, previously published GC-MS dataset.

Main Results:

  • The uafR package accurately identified known compounds in purified standards with high R2 values (0.827-0.999).
  • Analysis of a large dataset yielded comparable or identical compound identifications to manual methods.
  • The package demonstrated significant improvements in GC-MS data processing speed and accuracy.

Conclusions:

  • uafR drastically improves the speed and accuracy of GC-MS data processing.
  • The package facilitates efficient analysis of large datasets, supporting fields like exposomics and metabolomics.
  • uafR is freely available and applicable to any research utilizing GC-MS analysis.