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Related Concept Videos

Electrospray Ionization (ESI) Mass Spectrometry01:12

Electrospray Ionization (ESI) Mass Spectrometry

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ESI utilizes electrical energy to transfer ions from the liquid phase of the sample into the...
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Sample Preparation for Probe Electrospray Ionization Mass Spectrometry
05:47

Sample Preparation for Probe Electrospray Ionization Mass Spectrometry

Published on: February 19, 2020

Characteristics of probe electrospray generated from a solid needle.

Lee Chuin Chen1, Kentaro Nishidate, Yuta Saito

  • 1Clean Energy Research Center, University of Yamanashi, Takeda 4-3-11, Kofu 400-8511, Japan.

The Journal of Physical Chemistry. B
|August 14, 2008
PubMed
Summary
This summary is machine-generated.

Probe electrospray ionization (PESI) uses a solid needle for generating electrospray, offering stable ionization until sample depletion. This study characterizes PESI performance, examining factors influencing spray stability and mass spectra.

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Area of Science:

  • Analytical Chemistry
  • Mass Spectrometry

Background:

  • Probe electrospray ionization (PESI) is a novel technique generating electrospray from a solid needle, differing from traditional capillary-based methods.
  • Understanding PESI's fundamental characteristics is crucial for optimizing its application in mass spectrometry.

Purpose of the Study:

  • To investigate the operational characteristics of probe electrospray ionization (PESI).
  • To analyze the factors influencing spray current, stability, and mass spectral quality in PESI.

Main Methods:

  • Characterization of PESI using spray current measurements, optical microscopy, and PESI mass spectrometry.
  • Systematic variation of applied voltage, liquid sample loading, and needle movement.
  • Analysis of current pulsation and its correlation with sample loading.

Main Results:

  • PESI generates stable electrospray from a solid needle, with droplet size determined by needle tip dimensions.
  • Spray current, indicative of liquid flow rate, is influenced by applied voltage and sample volume.
  • Stable ionization is maintained until complete sample consumption; kilohertz current pulsation occurs with sample overloading.

Conclusions:

  • PESI is a viable alternative for generating electrospray, particularly for small sample volumes.
  • Applied voltage and liquid flow rate significantly impact PESI mass spectral outcomes.
  • PESI demonstrates controllable and stable ionization characteristics suitable for mass spectrometric analysis.