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Related Experiment Videos

A chip-scale universal detector for electrophoresis based on backscattering interferometry.

K Swinney1, D J Bornhop

  • 1Department of Chemistry and Biochemistry, Texas Tech University, Lubbock 79409-1061, USA.

The Analyst
|November 9, 2000
PubMed
Summary
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A novel on-chip detector uses backscatter interferometry for precise refractive index measurements in sub-nanoliter volumes. This system offers sensitive detection for capillary electrophoresis (CE) applications, enabling universal solute analysis.

Area of Science:

  • Analytical Chemistry
  • Optical Physics
  • Microfluidics

Background:

  • Refractive index measurements are crucial for analyzing fluid properties.
  • Existing methods for on-chip detection can be complex or lack sensitivity.
  • Sub-nanoliter volume analysis presents unique challenges in detection sensitivity and precision.

Purpose of the Study:

  • To develop a sensitive on-chip detector for refractive index measurements.
  • To utilize backscatter interferometry for label-free solute detection.
  • To evaluate the detector's performance in capillary electrophoresis (CE) separations.

Main Methods:

  • Fabrication of a silica (glass) plate with an etched half-cylinder channel.
  • Implementation of a folded optical train for laser beam interaction with the channel.

Related Experiment Videos

  • Analysis of interference patterns generated by backscattered light to determine refractive index changes.
  • Integration with capillary electrophoresis (CE) for solute separation and detection.

    • Main Results:

    • Achieved refractive index sensitivity at the 10(-6) level in a 188 x 10(-12) L detection volume.
    • Demonstrated injected mass detection limits as low as 530 fmol for sucrose and 720 fmol for raffinose under CE conditions.
    • Quantified fluorescein at the 150 microM level, indicating potential for universal detection.
    • Reported separation efficiencies ranging from 2300 to 15,500 plates.

    Conclusions:

    • The developed backscatter interferometry detector is highly sensitive for sub-nanoliter refractive index measurements.
    • The system shows significant potential for universal, label-free solute analysis in microfluidic devices, particularly with CE.
    • The simple optical design offers a promising platform for miniaturized analytical instrumentation.