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Flow injection analysis in a microfluidic format.

Andrew M Leach1, Aaron R Wheeler, Richard N Zare

  • 1Department of Chemistry, Stanford University, Stanford, California 94305-5080, USA.

Analytical Chemistry
|March 8, 2003
PubMed
Summary
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This study introduces a novel microfluidic flow injection analysis system for rapid chemical assays. The device offers high reproducibility and low detection limits, enabling efficient sample analysis with minimal consumption.

Area of Science:

  • Analytical Chemistry
  • Microfluidics
  • Biochemistry

Background:

  • Conventional flow injection analysis (FIA) systems can be cumbersome and require significant sample volumes.
  • Microfluidic devices offer miniaturization and enhanced control over fluid dynamics.
  • Integrating multiple components onto a single microfluidic chip is a key challenge in developing compact analytical systems.

Purpose of the Study:

  • To design and evaluate a novel microfluidic flow injection analysis (FIA) system.
  • To demonstrate the system's capability for rapid chemical assays with low sample consumption.
  • To achieve high precision and sensitivity in microfluidic analytical measurements.

Main Methods:

  • Fabrication of a two-layer poly(dimethylsiloxane) monolith integrating pumps, injection loop, and mixing column.

Related Experiment Videos

  • Development of a microfluidic injection system mimicking a six-port, two-way valve.
  • Utilizing fluorescence detection for assay measurements.
  • Performing chemical assays, including enzyme hydrolysis, on the microfluidic platform.

    • Main Results:

    • Achieved peak area reproducibility better than 3% relative standard deviation for 1.25 nL injection volumes.
    • Demonstrated a detection limit of 400 zmol for fluorescein using fluorescence detection.
    • Enabled rapid calibration curve generation in under 10 minutes.
    • Successfully performed enzyme assays with short analysis times and low sample consumption.

    Conclusions:

    • The developed microfluidic FIA system is a viable platform for sensitive and rapid chemical analysis.
    • The integrated design allows for simultaneous sample handling and measurement, enhancing efficiency.
    • This technology holds promise for applications requiring minimal sample volume and fast assay turnaround.