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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.
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 collision-induced...
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Space and Time Coherent Mapping for Subcellular Resolution of Imaging Mass Spectrometry.

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  • 1Center for Biosystems Dynamics Research, RIKEN, Saitama 351-0198, Japan.

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|November 11, 2022
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Summary

Space and time coherent mapping (STCM) offers high-resolution molecular imaging for single cells. This advanced matrix-assisted laser desorption ionization (MALDI) time of flight (TOF) imaging mass spectrometry (IMS) technique achieves subcellular precision, surpassing conventional methods.

Keywords:
Hirudo Verbanacluster analysisendocannabinoidepididymismicroscope-mode IMSneuronsilver nanoparticle PALDI

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Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Molecular Imaging

Background:

  • Conventional matrix-assisted laser desorption ionization (MALDI) time of flight (TOF) imaging mass spectrometry (IMS) methods face limitations in achieving high spatial resolutions.
  • Probe-based scanning techniques struggle to attain the subcellular scale necessary for detailed molecular analysis.

Purpose of the Study:

  • To introduce and validate Space and Time Coherent Mapping (STCM) as an advanced technology for MALDI-IMS.
  • To demonstrate STCM's capability for high-resolution molecular imaging at the subcellular level.
  • To highlight STCM's advantages over traditional probe-based scanning methods for single-cell analysis.

Main Methods:

  • Development of STCM technology utilizing a large field laser beam, advanced ion optics, and position-sensitive detectors.
  • Tracking individual ion flight trajectories from ionization to detection.
  • Application of STCM to analyze thinly sectioned biological samples, including leech segmental ganglia and epididymis.

Main Results:

  • STCM achieves unprecedented spatial resolution, enabling visualization of ionization sites at the subcellular scale.
  • The technology allows for the in situ imaging of bioactive lipid messengers and neuronal activity mediators with high precision.
  • STCM facilitates the integration of mass spectrometry data with optical cell anatomy and enables ion map cluster analysis.

Conclusions:

  • STCM-IMS is a superior technology for high-resolution single-cell molecular imaging compared to probe-based scanning mass spectrometry.
  • STCM provides detailed insights into the localization of biomolecules within cells.
  • This technique significantly advances the field of molecular imaging for biological research.