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Review: Microbial analysis in dielectrophoretic microfluidic systems.

Renny E Fernandez1, Ali Rohani1, Vahid Farmehini1

  • 1Department of Electrical and Computer Engineering, University of Virginia, Charlottesville, VA 22904, USA.

Analytica Chimica Acta
|April 5, 2017
PubMed
Summary
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Dielectrophoresis offers a label-free method for rapid microbial detection and characterization. This technique selectively captures microbes, addressing limitations in current diagnostic systems for improved point-of-care applications.

Area of Science:

  • Microbiology
  • Biotechnology
  • Analytical Chemistry

Background:

  • Microbial infections, including antibiotic-resistant strains, pose a significant global health threat.
  • Accurate microbial identification, quantification, and characterization are crucial for effective treatment and understanding disease dynamics.
  • Current detection systems face challenges balancing sensitivity with assay time, particularly for dilute samples.

Purpose of the Study:

  • To review advancements in AC electrokinetic methods, specifically dielectrophoresis, for selective and label-free microbial capture.
  • To compare microfluidic platforms for dielectrophoretic manipulation and their integration with various detection modalities.
  • To highlight the potential of these techniques for point-of-care diagnostics and phenotypic microbial assessment.

Main Methods:

Keywords:
AntibioticsBacteriaDielectrophoresisMicrofluidicsPhenotypeSensor

Related Experiment Videos

  • Utilizing AC electrokinetics, particularly dielectrophoresis, for frequency-selective capture of microbial cells and spores based on biophysical properties.
  • Elucidating polarization mechanisms to differentiate microbial cells from each other and from mammalian cells.
  • Reviewing microfluidic platforms designed for dielectrophoretic manipulation and downstream detection integration.

Main Results:

  • Dielectrophoresis enables selective capture of viable microbial cells and spores from dilute samples without labeling.
  • The technique allows for differentiation of microbial cells based on distinct size, shape, and sub-cellular characteristics.
  • Integration with detection methods like immuno-capture, impedance, Raman spectroscopy, and nucleic acid amplification is feasible.

Conclusions:

  • Label-free, selective electrokinetic techniques like dielectrophoresis offer a promising solution to current microbial detection limitations.
  • These methods can significantly reduce assay times and enhance target organism capture for point-of-care diagnostics.
  • Widespread adoption is envisioned for isolating intact microbials based on phenotype and subcellular features, advancing diagnostics and research.