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Protein Analysis by Electrospray-Orbital Frequency Analyzer with Charge Detection Mass Spectrometry Algorithm.

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A new algorithm enhances charge detection mass spectrometry (CDMS) for analyzing large biomolecules using an orbital frequency analyzer (OFA). This method improves protein detection sensitivity and mass resolution in FTMS.

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Area of Science:

  • Analytical Chemistry
  • Biophysics
  • Mass Spectrometry

Background:

  • Electrostatic ion trap mass analyzers, such as the orbital frequency analyzer (OFA), are crucial for Fourier Transform Mass Spectrometry (FTMS).
  • OFA offers ultrahigh mass resolution and high ion charge capacity, essential for analyzing large biological particles.
  • Charge detection mass spectrometry (CDMS) is employed for analyzing multiply charged proteins and other large biomolecules.

Purpose of the Study:

  • To develop a data processing algorithm for analyzing the image charge signal of nonharmonic waveforms in OFA-based CDMS.
  • To enable the detection of collisions, determination of ion lifetimes, and evaluation of charge and mass values for ions.
  • To eliminate chemical noise and facilitate the measurement of protein content at very low concentrations.

Main Methods:

  • A novel data processing algorithm was created to interpret the nonharmonic image charge signals from ions within an OFA.
  • The algorithm detects ion-molecule collisions to determine ion lifetimes.
  • Ions with lifetimes above a set threshold are used to evaluate charge and mass, filtering out noise.

Main Results:

  • The algorithm successfully filters chemical noise from small molecules and protein fragments, enabling protein concentration measurements down to tens of nanomolars.
  • Standard deviation of charge measurement ranges from 1.1 to 1.8 e for ions with oscillation lifetimes between 1 and 0.4 s.
  • Lower OFA voltage settings lead to longer ion survival times and narrower mass peak widths, improving spectral resolution.

Conclusions:

  • The developed algorithm significantly enhances the capability of OFA-based CDMS for analyzing large, multiply charged biomolecules.
  • The method allows for precise determination of ion charge and mass, improving the detection limits for proteins.
  • While OFA supports multiplexed CDMS, coexisting ions with similar m/z can interfere with charge determination, requiring careful data interpretation.