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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.
ESI utilizes electrical energy to transfer ions from the liquid phase of the sample into the...
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Droplet-assisted electrospray phase separation using an integrated silicon microfluidic platform.

Yan Zhang1, Sungho Kim1, Weihua Shi1

  • 1Department of Electrical and Computer Engineering, University of Illinois Urbana Champaign, IL 61801, USA. yvlasov@illinois.edu.

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Summary
This summary is machine-generated.

This study introduces a silicon microfluidic platform for precise analyte handling. It integrates droplet generation and nano-electrospray ionization for advanced mass spectrometry.

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Area of Science:

  • Microfluidics
  • Mass Spectrometry
  • Analytical Chemistry

Background:

  • Microfluidic devices are crucial for miniaturized chemical analysis.
  • Integrating multiple functions on a single chip remains a challenge.
  • Efficient sample introduction into mass spectrometry is key for sensitivity.

Purpose of the Study:

  • To develop a silicon microfluidic platform with integrated functionalities.
  • To enable on-chip droplet generation and nano-electrospray ionization.
  • To facilitate mass spectrometry analysis of segmented aqueous and oil phases.

Main Methods:

  • Fabrication of a monolithic silicon microfluidic chip.
  • Integration of transparent microchannels for analyte flow.
  • On-chip segmentation of analytes into picoliter droplets.
  • Development of a nano-electrospray ionization emitter for phase separation.

Main Results:

  • Successful monolithic integration of microfluidic channels and droplet generation.
  • Demonstration of spatial and temporal separation of oil and aqueous phases during electrospray.
  • Enabling direct mass spectrometry analysis of segmented microdroplets.

Conclusions:

  • The developed silicon microfluidic platform offers a versatile tool for advanced analytical applications.
  • This integrated approach simplifies sample handling and enhances mass spectrometry performance.
  • The platform shows promise for analyzing complex samples, including emulsions.