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A microfluidic mixing system for single-molecule measurements.

Shawn H Pfeil1, Charles E Wickersham, Armin Hoffmann

  • 1Department of Physics, University of California, Santa Barbara, California 93106, USA.

The Review of Scientific Instruments
|June 3, 2009
PubMed
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Researchers developed a novel microfluidic mixing system for ultrasensitive optical measurements. This system enables single-molecule detection with low background noise and rapid sample handling.

Area of Science:

  • Microfluidics
  • Optical Measurement Systems
  • Biophysics

Background:

  • Ultrasensitive optical measurements require specialized microfluidic devices.
  • Existing systems may have limitations in chemical compatibility or background fluorescence.
  • Controlling nonequilibrium conditions is crucial for single-molecule studies.

Purpose of the Study:

  • To design and fabricate a microfluidic mixing system optimized for ultrasensitive optical measurements.
  • To achieve broad chemical compatibility and minimal fluorescence background.
  • To facilitate the study of individual molecules under controlled nonequilibrium conditions.

Main Methods:

  • Replica-molding of microfluidic channels in polydimethylsiloxane (PDMS).
  • Sealing of channels with fused-silica coverglass.

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Last Updated: Jun 22, 2026

Microfluidic Mixers for Studying Protein Folding
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Analyzing Mixing Inhomogeneity in a Microfluidic Device by Microscale Schlieren Technique
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Analyzing Mixing Inhomogeneity in a Microfluidic Device by Microscale Schlieren Technique

Published on: June 12, 2015

  • Development of a specialized interface for fluid delivery, pressure connections, and optical access.

    • Main Results:

    • Fabricated microfluidic devices exhibit broad chemical compatibility.
    • The system demonstrates extremely low fluorescence background.
    • The design allows for rapid assembly, sample exchange, and modular replacement.
    • Enables high numerical aperture optical access for sensitive measurements.

    Conclusions:

    • The developed microfluidic mixing system is suitable for ultrasensitive optical measurements.
    • The system's design overcomes limitations of previous devices, enabling single-molecule studies.
    • This technology advances the capability for investigating complex biological and chemical processes at the molecular level.