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Related Concept Videos

Electrospray Ionization (ESI) Mass Spectrometry01:12

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Higher molecular weight biomolecules are nonvolatile compounds that may decompose before ionizing or vaporizing during mass analysis with conventional electron impact ionization methods. Accordingly, electrospray ionization (ESI) is the favored method for vaporizing and ionizing biomolecules as it circumvents rapid fragmentation and enables the recording of mass signals for the entire biomolecule.
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Atmospheric Pressure Ionization Using a High Voltage Target Compared to Electrospray Ionization.

Arnaud Lubin1, Steve Bajic2, Deirdre Cabooter3

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Summary

A novel atmospheric pressure ionization (API) source, UniSpray, demonstrates a 2.2-fold intensity gain over electrospray ionization (ESI) for mass spectrometry analysis of diverse pharmaceutical compounds.

Keywords:
APIESIElectrosprayIonizationMSMass spectrometrySourceUniSpray

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Area of Science:

  • Analytical Chemistry
  • Mass Spectrometry
  • Pharmaceutical Analysis

Background:

  • Electrospray ionization (ESI) is a common atmospheric pressure ionization technique for mass spectrometry.
  • Evaluating novel API sources is crucial for improving sensitivity and expanding analytical capabilities.

Purpose of the Study:

  • To evaluate the performance of a new atmospheric pressure ionization (API) source, UniSpray.
  • To compare UniSpray head-to-head with electrospray ionization (ESI) for pharmaceutical compound analysis.

Main Methods:

  • The UniSpray source, featuring a grounded nebulizer and a high-voltage target, was tested against ESI.
  • A mixture of 22 diverse pharmaceutical compounds was analyzed under over 100 different conditions.
  • High-resolution mass spectrometry was employed for the comparative analysis.

Main Results:

  • UniSpray demonstrated ionization mechanisms similar to ESI, producing predominantly protonated/deprotonated species.
  • Adduct formation and in-source fragmentation were nearly identical between UniSpray and ESI.
  • UniSpray provided an average intensity gain of 2.2 times compared to ESI across all tested compounds and conditions.

Conclusions:

  • UniSpray represents a significant advancement in API sources for mass spectrometry.
  • The new source offers enhanced sensitivity for pharmaceutical compound analysis compared to ESI.
  • Further investigation into UniSpray's ionization mechanism is warranted.