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Related Concept Videos

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 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.
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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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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 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...
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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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Ion Mobility Separation Using a Dual-LIT Miniature Mass Spectrometer.

Jingjin Fan1, Penglong Lian1, Ming Li2

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

Analytical Chemistry
|January 16, 2020
PubMed
Summary

This study demonstrates ion mobility (IM) separation using dual-linear ion traps within a miniature mass spectrometer. This simplified approach enables effective analysis of diverse chemical and biological compounds.

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Area of Science:

  • Analytical Chemistry
  • Biophysical Chemistry
  • Spectrometry

Background:

  • Ion mobility (IM) coupled with mass spectrometry (MS) is a powerful analytical technique.
  • Traditional IM-MS instrumentation often involves complex setups and precise control.

Purpose of the Study:

  • To explore the feasibility of performing ion mobility separation using dual-linear ion traps (LITs) in a miniaturized mass spectrometer.
  • To develop a simplified IM-MS approach with a straightforward instrumentation configuration.

Main Methods:

  • Utilized dual-linear ion traps (LITs) for ion separation.
  • Achieved IM separation through dynamic gas flow and ion transfer between LITs.
  • Characterized performance using small organic compounds (trisaccharides, raffinose, cellotriose, melezitose) and protein conformers.

Main Results:

  • Successfully demonstrated ion mobility separation within a miniature mass spectrometer.
  • The technique proved effective for a range of chemical and biological analytes.
  • Showcased the capability of LITs for IM separation with dynamic gas flow.

Conclusions:

  • Ion mobility separation can be effectively performed using dual-linear ion traps in a miniature mass spectrometer.
  • This simplified configuration offers a viable alternative to complex IM-MS systems.
  • Highlights the potential for developing powerful hybrid instrument functions in compact devices.