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Related Experiment Videos

Efficient electrospray ionization from polymer microchannels using integrated hydrophobic membranes.

Ying-Xin Wang1, Jon W Cooper, Cheng S Lee

  • 1Department of Mechanical Engineering, University of Maryland, College Park, MD, USA.

Lab on a Chip
|July 23, 2004
PubMed
Summary

A new method creates stable electrospray ionization (ESI) tips in polymer microfluidics using a hydrophobic membrane. This innovation enables reliable, low-flow rate operation for mass spectrometry interfacing.

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Area of Science:

  • Analytical Chemistry
  • Microfluidics
  • Mass Spectrometry

Background:

  • Electrospray ionization (ESI) is crucial for interfacing separation techniques with mass spectrometry.
  • Achieving stable ESI from polymer microfluidic devices at low flow rates remains challenging.
  • Existing methods often suffer from poor stability and limited operational ranges.

Purpose of the Study:

  • To develop a simple and reliable method for fabricating stable electrospray ionization tips in polymer microfluidic systems.
  • To demonstrate the effectiveness of a hydrophobic membrane in controlling Taylor cone formation and stability.
  • To validate the performance of the fabricated ESI tips using optical, electrical, and mass spectrometry methods.

Main Methods:

  • Incorporation of a thin hydrophobic membrane at the microchannel exit of polymer microfluidic chips.

Related Experiment Videos

  • Optical imaging to observe Taylor cone formation and stability at various flow rates.
  • Electrical monitoring to measure electrospray current stability over extended periods.
  • Mass spectrometry analysis of myoglobin to validate the performance of the ESI interface.

    • Main Results:

    • The hydrophobic membrane effectively constrained lateral dispersion, leading to well-defined Taylor cones.
    • Stable electrospray was achieved at flow rates as low as 80 nL/min (optical) and 10 nL/min (electrical).
    • Continuous stable operation exceeding several hours was demonstrated.
    • Mass spectrometry analysis confirmed the successful ionization and detection of myoglobin.

    Conclusions:

    • The hydrophobic membrane approach provides a simple and effective solution for stable electrospray ionization in polymer microfluidics.
    • This method enables reliable interfacing of disposable microfluidic separation platforms with mass spectrometry at low flow rates.
    • The developed technology holds potential for low-cost, direct coupling in analytical applications.