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Identification of Isomeric Metabolites Using Cold Ion Spectroscopy Add-on to Orbitrap-Based Mass Spectrometer.

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A new compact cold ion spectroscopy (CIS) add-on module for mass spectrometry enables metabolite identification. This tool aids in determining chemical structures of trace-level metabolites, overcoming previous instrumentation limitations.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Metabolomics

Background:

  • Identifying trace-level metabolites is crucial but challenging.
  • Current cold ion spectroscopy (CIS) methods lack accessible commercial instrumentation.
  • Orbitrap-based mass spectrometry (MS) offers high resolution for structural analysis.

Purpose of the Study:

  • To develop a compact CIS add-on module for Orbitrap MS.
  • To demonstrate the utility of UV-MS photofragmentation CIS for metabolite identification.
  • To enable structural elucidation of metabolites from predicted candidates.

Main Methods:

  • Noninvasive interfacing of a CIS module to an Orbitrap MS.
  • High-resolution UV-MS photofragmentation CIS.
  • Analysis of "prompt" photofragments to identify functional group attachment.
  • Comparison of UV spectra with chromophore standards for precise localization.

Main Results:

  • Successfully demonstrated metabolite structural identification using the developed CIS-MS system.
  • Showcased how prompt photofragments indicate functional group attachment to chromophores.
  • Validated the workflow through blind structural identification of a drug metabolite.

Conclusions:

  • The compact CIS add-on module significantly enhances metabolite identification capabilities.
  • This approach facilitates the structural elucidation of trace-level compounds.
  • The developed workflow is effective for identifying unknown drug metabolites.