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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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In High-Performance Liquid Chromatography (HPLC), the elution process is critical to the separation of analytes and the quality of chromatographic results. Elution describes how compounds move through the column and separate based on their interactions with the mobile and stationary phases. This process determines the resolution, peak shape, and retention times in the chromatogram, which are essential for identifying and quantifying components in complex mixtures. Understanding the elution...
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Nested-channel for on-demand alternation between electrospray ionization regimes.

Mengtian Li1, Huishan Li1, Nicholas R Allen1

  • 1Department of Chemistry, University of New Hampshire 23 Academic Way Durham NH 03824 USA Anyin.Li@unh.edu.

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This study introduces a novel nested electrospray ionization (nested-ESI) platform for on-demand analysis. It enhances ionization efficiency and reduces salt adducts for saccharides, glycopeptides, and proteins.

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Area of Science:

  • Analytical Chemistry
  • Mass Spectrometry
  • Separation Science

Background:

  • Electrospray ionization (ESI) is a crucial technique in mass spectrometry.
  • Controlling droplet size and ionization efficiency in ESI remains a challenge.
  • Developing versatile ESI emitters for on-demand analysis is highly desirable.

Purpose of the Study:

  • To develop and demonstrate an on-demand electrospray ionization platform with dual liquid channels.
  • To investigate the performance of nested electrospray ionization (nested-ESI) for various analytes.
  • To explore the benefits of regime alternation for improved ionization and reduced adducts.

Main Methods:

  • Fabrication of a filamented capillary emitter with nested channels.
  • Utilizing gas-phase charge supply to trigger electrospray ionization.
  • Implementing on-demand regime alternation between main-channel and sub-channel ESI.
  • Analyzing saccharides, glycopeptides, proteins, and peptide mixtures.

Main Results:

  • Successful on-demand electrospray ionization from two nested channels within a single emitter.
  • Sub-channel regime generated smaller charged droplets, enhancing ionization efficiencies for biomolecules.
  • Reduced non-specific salt adducts and improved response uniformity for peptide mixtures.
  • Effective emitter tip washing capability for multiple analyses.

Conclusions:

  • The nested-ESI platform offers enhanced sensitivity and reduced interferences for complex biological samples.
  • On-demand regime alternation provides a powerful tool for optimizing mass spectrometry analyses.
  • This technology has significant potential for improving the analysis of peptides, proteins, and other biomolecules.