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Frequency-Modulated Continuous Flow Analysis Electrospray Ionization Mass Spectrometry (FM-CFA-ESI-MS) for Sample

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This study introduces a novel mass spectrometry method for analyzing multiple samples simultaneously without chemical tags. The technique uses unique frequencies for each sample, enabling accurate identification and quantification.

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Area of Science:

  • Analytical Chemistry
  • Spectrometry

Background:

  • Multiplexed sample analysis is crucial for high-throughput screening.
  • Existing methods often require chemical tagging, adding complexity and cost.
  • There is a need for simpler, tag-free multiplexing techniques in mass spectrometry.

Purpose of the Study:

  • To present a new method for tag-free multiplexed sample analysis using mass spectrometry.
  • To demonstrate the feasibility of analyzing multiple samples concurrently by pulsing them at unique frequencies.
  • To establish a foundation for future advancements in high-capacity multiplexing.

Main Methods:

  • Samples are pulsed at unique frequencies and mixed before entering the mass spectrometer.
  • A constant total flow rate is maintained throughout the process.
  • Spectral deconvolution of reconstructed ion currents identifies samples by frequency and quantifies them by peak height.

Main Results:

  • Successfully multiplexed two samples, each containing up to nine analytes.
  • Demonstrated increased linear dynamic range with extended acquisition times and longer oscillation periods.
  • Showed minimal impact of salt on relative quantitation, highlighting method robustness.

Conclusions:

  • The developed frequency-encoded multiplexing method offers a tag-free approach for mass spectrometry.
  • The technique shows promise for accurate identification and quantification of multiple analytes simultaneously.
  • Further development is expected to enable multiplexing of a larger number of samples.