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Faster and improved microchip electrophoresis using a capillary bundle.

Yi Sun1, Yien Chian Kwok, Nam Trung Nguyen

  • 1National Institute of Education, Nanyang Technological University, Singapore, Singapore.

Electrophoresis
|December 12, 2007
PubMed
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This study introduces a novel microchip capillary electrophoresis (CE) method using a photonic crystal fiber (PCF) bundle. This approach enhances separation efficiency by mitigating Joule heating in narrow channels.

Area of Science:

  • Analytical Chemistry
  • Separation Science
  • Microfluidics

Background:

  • Joule heating in microchip CE negatively impacts separation efficiency and reproducibility.
  • Reducing microchannel cross-sections is key to mitigating Joule heating.
  • Current fabrication limits typical CE microchannels to 50-200 micrometers.

Purpose of the Study:

  • To propose and evaluate a novel microchip CE approach using a photonic crystal fiber (PCF) bundle.
  • To overcome fabrication limitations for achieving extremely narrow separation channels.
  • To enhance separation speed and performance by effectively managing Joule heating.

Main Methods:

  • Utilizing a photonic crystal fiber (PCF) as a separation column within a poly(methyl methacrylate) (PMMA) microchannel.

Related Experiment Videos

  • Performing simultaneous and independent capillary electrophoresis (CE) in 54 capillaries, each with a 3.7 micrometer diameter.
  • Employing a T-shaped injector for sample introduction.

    • Main Results:

    • The PCF capillary bundle sustained high electric field strengths up to 1000 V/cm.
    • Efficient heat dissipation was achieved due to the narrow channel dimensions.
    • Faster and enhanced separation performance was attained compared to conventional methods.

    Conclusions:

    • Microchip CE in extremely narrow channels, facilitated by PCF, offers a viable strategy to reduce Joule heating effects.
    • This novel approach enables higher electric field strengths, leading to improved separation efficiency and speed.
    • The PCF-based CE system demonstrates potential for advanced analytical separations in microfluidic devices.