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Novel electrode structures for large scale dielectrophoretic separations based on textile technology.

Zurina Z Abidin1, Les Downes, Gerard H Markx

  • 1School of Chemical Engineering and Analytical Science, The University of Manchester, Sackville Street, P.O. Box 88, Manchester M60 1QD, UK. zurina@eng.upm.edu.my

Journal of Biotechnology
|May 8, 2007
PubMed
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Researchers developed a novel woven micro-electrode array for large-scale dielectrophoresis (DEP) applications. This innovative textile-based system effectively separates yeast cells in a continuous flow, overcoming previous volume limitations.

Area of Science:

  • Biomedical Engineering
  • Microfluidics
  • Separation Science

Background:

  • Dielectrophoresis (DEP) is typically limited to small volumes due to fabrication challenges of large microelectrode arrays.
  • Existing DEP systems face difficulties in scaling up for high-throughput cell processing.

Purpose of the Study:

  • To develop a novel, scalable micro-electrode array for dielectrophoresis using a weaving technique.
  • To demonstrate the effectiveness of this woven DEP system for continuous cell separation.

Main Methods:

  • A plain weave fabric was constructed using stainless steel wires and polyester yarns to create micro-electrodes.
  • A 14 ml separation chamber was fabricated by layering the woven material with perspex slabs.
  • Dielectrophoretic collection of yeast cells was performed using an AC power source at specific frequencies and voltages.

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Main Results:

  • The woven micro-electrode array successfully collected yeast cells from deionised water using dielectrophoresis.
  • The system demonstrated effective collection of live yeast cells from a continuous flow at rates up to 5 ml min-1.
  • Separation of live and dead yeast cells was achieved, although some cell loss due to sedimentation was observed.

Conclusions:

  • A novel woven textile-based micro-electrode array offers a scalable solution for dielectrophoresis.
  • This approach enhances DEP capabilities by utilizing fabric structure to distort electric fields, improving cell attraction.
  • The developed DEP chamber shows promise for continuous, large-volume cell separation and differentiation.