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Related Concept Videos

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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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 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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Mass Spectrometry of Amines01:15

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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 Spectrometry: Isotope Effect01:13

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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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Chemical Ionization (CI) Mass Spectrometry01:21

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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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Semi-Quantitative Analysis of Peptidoglycan by Liquid Chromatography Mass Spectrometry and Bioinformatics
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Direct sampling mass spectrometry for clinical analysis.

Fan Pu1, Spencer Chiang, Wenpeng Zhang

  • 1State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing, 100084, China.

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|December 7, 2018
PubMed
Summary
This summary is machine-generated.

Direct sampling mass spectrometry (MS) offers rapid clinical analysis with minimal sample prep. This review highlights its potential for point-of-care diagnostics and quantitative applications.

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Area of Science:

  • Analytical Chemistry
  • Clinical Diagnostics

Background:

  • Traditional mass spectrometry (MS) requires extensive sample preparation and chromatographic separation.
  • Direct sampling mass spectrometry (MS) enables rapid analysis with minimal sample pretreatment.
  • This approach holds significant potential for clinical applications.

Purpose of the Study:

  • To provide an overview of direct sampling mass spectrometry (MS) developments.
  • To emphasize quantitative and non-quantitative clinical applications of direct sampling MS.
  • To discuss the integration of direct sampling MS with miniature mass spectrometers for point-of-care analysis.

Main Methods:

  • Overview of ambient ionization techniques.
  • Review of fast extraction methods for direct sampling.
  • Discussion of quantitative and non-quantitative MS applications.

Main Results:

  • Direct sampling MS significantly simplifies sample analysis procedures.
  • Various direct sampling MS methods demonstrate efficacy in clinical settings.
  • Integration with miniature mass spectrometers enhances point-of-care capabilities.

Conclusions:

  • Direct sampling MS is a rapidly advancing field with immense clinical potential.
  • The technology facilitates faster, simpler diagnostic analyses.
  • Future outlook points to direct sampling MS as a key tool for point-of-care diagnostics.