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Capillary Electrophoresis: Instrumentation01:20

Capillary Electrophoresis: Instrumentation

Capillary electrophoresis instrumentation typically consists of several key components. A high-voltage power supply generates the electric field necessary for the separation by connecting to an anode (the positively charged electrode) and a cathode (the negatively charged electrode) located in buffer reservoirs at each end of the capillary tube. The system includes a sample vial, a fused silica capillary tube coated with polyimide for mechanical strength through which the sample components...

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A simplified method for capillary embedment into microfluidic devices - exemplified by sol-gel-based

Sara Thorslund1, Nina Johannesson, Fredrik Nikolajeff

  • 1Department of Engineering Sciences, Angström Laboratory, Uppsala University, Uppsala, Sweden.

Electrophoresis
|November 17, 2007
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Summary

This study introduces a new method for embedding functionalized capillaries into polydimethylsiloxane (PDMS) microdevices using oxygen plasma bonding. This technique simplifies microchip assembly and enables robust integration of preconcentration modules for mass spectrometry.

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Area of Science:

  • Microfluidics
  • Materials Science
  • Analytical Chemistry

Background:

  • Integrating functionalized components into polydimethylsiloxane (PDMS) microdevices is crucial for advanced analytical applications.
  • Previous methods for capillary embedding in PDMS faced challenges like contamination and clogging.
  • Off-chip modification of capillaries allows for functionalization without compromising existing microdevice chemistry.

Purpose of the Study:

  • To present an alternative, simplified method for embedding functionalized square capillaries into PDMS microdevices.
  • To demonstrate a robust bonding technique using oxygen plasma to prevent clogging and leakage.
  • To evaluate the performance of the integrated system for sample preconcentration using mass spectrometry.

Main Methods:

  • Fabrication of PDMS microdevices with square channels.
  • Preparation of functionalized square capillaries (e.g., with sol-gel for preconcentration).
  • Oxygen plasma treatment for bonding the capillary to the PDMS microchannel and lid.

Main Results:

  • Successful leak-free integration of functionalized capillaries into PDMS microdevices.
  • Demonstrated effective peptide preconcentration using a sol-gel integrated capillary.
  • Achieved high reproducibility in preconcentration runs with migration time variations below 3%.

Conclusions:

  • The oxygen plasma bonding technique offers a simplified and reliable method for assembling functionalized capillary-PDMS microdevices.
  • This approach prevents contamination and clogging, enhancing microdevice fabrication robustness.
  • The developed technique facilitates the integration of preconcentrators and other functional modules into complex microfluidic systems.