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Self-regulated, droplet-based sample chopper for microfluidic absorbance detection.

Kennon S Deal1, Christopher J Easley

  • 1Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849, USA.

Analytical Chemistry
|December 24, 2011
PubMed
Summary
This summary is machine-generated.

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This study introduces a microfluidic sample chopper (μChopper) that uses droplets to enable sensitive molecular absorbance detection. This innovation significantly lowers detection limits in microfluidic systems, simplifying complex analyses.

Area of Science:

  • Microfluidics
  • Analytical Chemistry
  • Optical Sensing

Background:

  • Molecular absorbance detection is challenging in microfluidics due to short path lengths.
  • Existing microfluidic absorbance methods often require complex fabrication or optical setups.
  • Signal drift and noise (1/f noise) hinder sensitive detection in microfluidic devices.

Purpose of the Study:

  • To develop a simple, hand-operated microfluidic device for sensitive molecular absorbance detection.
  • To demonstrate a fluidic analog to optical beam chopping for phase-sensitive detection.
  • To reduce the detection limit of absorbance measurements in microfluidic systems.

Main Methods:

  • Formation and routing of aqueous droplets in oil to create a microfluidic sample chopper (μChopper).

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  • Utilizing opposing droplet generators to passively alternate sample and reference droplets at ~10 Hz.
  • Employing lock-in analysis to synchronize with droplet generation, minimizing signal drift and noise.

    • Main Results:

    • Achieved a detection limit of 3.0 × 10(-4) absorbance units (500 nM bromophenol blue, 29 fmol) in a 27 μm path.
    • Demonstrated successful application to nanoliter pH sensing, validated against a spectrophotometer.
    • Reduced detection limits significantly compared to conventional microfluidic absorbance techniques.

    Conclusions:

    • The μChopper effectively mimics optical beam chopping using fluidic droplets.
    • This self-regulated system simplifies microfluidic absorbance measurements and enhances sensitivity.
    • The technology offers a low-cost, user-friendly approach for sensitive detection in microfluidics.