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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 signal-to-noise ratio for the analyte. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.
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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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In inductively coupled plasma–mass spectrometry (ICP–MS), an inductively coupled plasma (ICP) torch is used as an atomizer and ionizer. Solid samples are dissolved and volatilized before being introduced into the high-temperature argon plasma, while solution samples are nebulized and passed through the high-temperature argon plasma. Plasma dissociates the analytes and ionizes their component atoms to form a mixture of positive ions and molecular species. The positive ions are then...
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Higher molecular weight biomolecules are nonvolatile compounds that may decompose before ionizing or vaporizing during mass analysis with conventional electron impact ionization methods. Accordingly, electrospray ionization (ESI) is the favored method for vaporizing and ionizing biomolecules as it circumvents rapid fragmentation and enables the recording of mass signals for the entire biomolecule.
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Direct Implementation of MSn Using Frequency Scanning Collision Induced Dissociation in a Digital Ion Trap Mass

Jie Ren1, Pingping Chen1, Yunjing Zhang1

  • 1School of Electronic and Information Engineering, Soochow University, Suzhou 215006, China.

Journal of the American Society for Mass Spectrometry
|December 23, 2024
PubMed
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Reverse scanning-collision induced dissociation (RS-CID) enhances low-mass fragment ions and simplifies tandem mass spectrometry (MSn) analysis. This novel method improves ion detection and speeds up analysis for complex molecular structures.

Keywords:
Digital linear ion trapDissociation efficiencyMSn spectraReverse scanning-collision induced dissociation

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Area of Science:

  • Analytical Chemistry
  • Mass Spectrometry
  • Organic Chemistry

Background:

  • Tandem mass spectrometry (MSn) is crucial for organic molecule structure elucidation, observing multigenerational ion fragments.
  • Conventional collision-induced dissociation (CID) in ion trap mass spectrometry (ITMS) is complex, limited by low-mass cutoff (LMCO) and weak fragmentation.
  • ITMS is favored for on-site detection due to its MSn capability and compact size.

Purpose of the Study:

  • To introduce and evaluate a novel RS-CID method for enhanced MSn analysis in ITMS.
  • To improve the detection of low-mass fragment ions and reduce the LMCO effect.
  • To simplify MSn workflows and accelerate the analysis of complex organic molecules.

Main Methods:

  • Developed and applied reverse scanning-collision induced dissociation (RS-CID) by increasing RF and AC frequencies while keeping RF voltage constant.
  • Analyzed twelve illegal drugs using RS-CID, comparing results to conventional dissociation methods.
  • Acquired multigeneration fragment ion spectra in a single sequence for ketamine and methamphetamine.

Main Results:

  • RS-CID significantly enhanced the intensities of low-mass fragment ions compared to conventional CID.
  • The method effectively reduced the low-mass cutoff (LMCO) effect and slightly improved CID efficiency.
  • RS-CID successfully distinguished between challenging isomers, including ab-4en-pinaca/adb-3en-butinaca and 5f-cumyl-pegaclone/cumyl-pipetinaca.

Conclusions:

  • RS-CID enables efficient MSn analysis within a single sequence, simplifying workflows and accelerating analysis.
  • The method improves low-mass fragment ion intensity, providing more valuable mass spectral information.
  • RS-CID offers a promising advancement for on-site detection and structural analysis using ITMS.