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Continuous-flow single-molecule CE with high detection efficiency.

Perry G Schiro1, Christopher L Kuyper, Daniel T Chiu

  • 1Department of Chemistry, University of Washington, Seattle, WA 98195-1700, USA.

Electrophoresis
|June 20, 2007
PubMed
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This study introduces line-confocal detection for enhanced single-molecule analysis in microfluidic channels. This method improves detection efficiency and signal-to-background ratio for molecular mobility measurements in capillary electrophoresis (CE).

Area of Science:

  • Analytical Chemistry
  • Microfluidics
  • Spectroscopy

Background:

  • High-sensitivity single-molecule detection typically uses point-confocal microscopy with small (approx. 500 nm) focal spots.
  • This necessitates nanometer-sized channels, limiting sample throughput and flexibility.
  • Larger microchannels are desirable for broader applications but pose detection challenges.

Purpose of the Study:

  • To develop and evaluate a line-confocal detection geometry for single-molecule analysis in microchannels.
  • To compare its performance against traditional point-confocal detection.
  • To enable continuous-flow capillary electrophoresis (CE) using this enhanced detection method.

Main Methods:

  • Utilized cylindrical optics to create a diffraction-limited rectangular illumination area (approx. 500 nm width, micrometer length).

Related Experiment Videos

  • Employed two-beam line-confocal detection geometry for single-molecule fluorescence measurements.
  • Implemented two-beam fluorescent cross-correlation spectroscopy (FCCS) with spatially offset detectors for transit time determination.

    • Main Results:

    • Line-confocal detection significantly improved signal-to-background ratio and spatial detection efficiency in micrometer-sized channels.
    • Achieved 94% detection efficiency for single Alexa488 dye molecules in a 2 µm channel using line-confocal detection.
    • Demonstrated successful separation of FITC, FITC-glutamate, and FITC-glycine using continuous-flow CE with this method.

    Conclusions:

    • Line-confocal detection is superior to point-confocal detection for single-molecule analysis in microchannels.
    • This technique enhances molecular mobility measurements and enables efficient continuous-flow CE.
    • The developed method offers improved sensitivity and efficiency for analyzing individual molecules.