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Sampling and electrophoretic analysis of segmented flow streams using virtual walls in a microfluidic device.

Gregory T Roman1, Meng Wang, Kristin N Shultz

  • 1Department of Chemistry, University of Michigan, Ann Arbor 48109, USA.

Analytical Chemistry
|October 4, 2008
PubMed
Summary

This study introduces a novel method for analyzing aqueous plugs in oil using microfluidics and electrophoresis. The technique enables efficient sample injection and high-resolution analysis, advancing segmented flow applications.

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Area of Science:

  • Analytical Chemistry
  • Microfluidics
  • Separation Science

Background:

  • Segmented flow analysis (SFA) is widely used for chemical manipulations.
  • Traditional analysis of segmented aqueous plugs in oil relies on optical methods.
  • A need exists for advanced analytical techniques for SFA systems.

Purpose of the Study:

  • To develop a new method for sampling and electrophoretic analysis of aqueous plugs in immiscible oil streams.
  • To create efficient injection techniques for channel electrophoresis using a microfluidic virtual wall.
  • To demonstrate the utility of this method for real-time monitoring.

Main Methods:

  • A microfluidic K-shaped element creates a virtual wall between aqueous buffer and oil streams.
  • Electrokinetic transfer of aqueous sample plugs into the aqueous stream.
  • Two injection methods: a discrete injector and a desegmenting injector for channel electrophoresis.

Main Results:

  • The discrete injector enabled over 800 injections with 5.1% RSD and up to 1,050 theoretical plates.
  • The desegmenting injector achieved over 1000 sequential injections with 5.8% RSD and 53,500 theoretical plates.
  • Demonstrated 10-second temporal resolution for monitoring concentration changes.

Conclusions:

  • The developed method provides a novel approach for analyzing aqueous plugs in segmented flows.
  • This technique enhances the capabilities of microfluidic electrophoresis for SFA.
  • It opens new avenues for applications in chemical synthesis, assays, and real-time monitoring.