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Area of Science:

  • Analytical Chemistry
  • Mass Spectrometry
  • Chemical Instrumentation

Background:

  • Combining multiple ion sources on a single mass spectrometer presents challenges in signal interference and complex setup.
  • Existing methods often lack the flexibility to integrate diverse ionization techniques and perform in-situ chemical reactions.

Purpose of the Study:

  • To develop a versatile and interference-free system for combining multiple ion sources with a single mass spectrometer.
  • To enable simultaneous analyses, ion-molecule reactions, and advanced data acquisition strategies.

Main Methods:

  • A novel system utilizing flexible copper tubing and specialized valves to transport ions from separate sources to a single mass spectrometer.
  • Integration of native electrospray ionization (ESI), regular ESI, beta-electron ionization, and atmospheric pressure photoionization (APPI).
  • Development of a sequential window acquisition of all theoretical mass spectra (SWATH MS) approach with thermal fragmentation and a reference channel.

Main Results:

  • Successful combination of four distinct ion sources (native ESI, regular ESI, β-electrons, APPI) without interference.
  • Demonstration of in-situ ion-molecule reactions, including gas-phase H/D exchange and potential for Paternò-Büchi and ozonation reactions.
  • Implementation of a modified SWATH MS technique for enhanced peptide ion analysis through differential thermal fragmentation.

Conclusions:

  • The developed multichannel system offers a flexible and robust platform for advanced mass spectrometry applications.
  • This approach significantly enhances structural and chemical information retrieval for unknown species by enabling comparative analyses.
  • The system's modularity supports a wide range of ion sources and in-situ chemical transformations, broadening analytical capabilities.