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Related Concept Videos

Flow Cytometry01:23

Flow Cytometry

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The development of flow cytometry techniques began in 1934 with initial attempts by Andrew Moldavan, a bacteriologist who counted the cells in a flowing capillary system. Moldavan pumped cells through a capillary tube focused under a microscope for visualization. The invention of photometry allowed the measurement of differentially-stained cells, and Louis Kamentsky developed the first multiparameter flow cytometer in 1965 to identify and count the cancer cells in cervical tissue specimens.
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Using Impedance Flow Cytometry for Rapid Viability Classification of Heat-Treated Bacteria.

Christian Vinther Bertelsen1,2, Gustav Erik Skands2, Marcos González Díaz2

  • 1DTU Bioengineering, Technical University of Denmark, Søltofts Plads 221, 2800 Kgs Lyngby, Denmark.

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Electrical impedance flow cytometry rapidly distinguishes heat-treated bacteria. Lower medium conductivity and longer heat exposure improve classification accuracy for viable E. coli detection.

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Area of Science:

  • Microbiology
  • Biophysics
  • Electrical Engineering

Background:

  • Impedance flow cytometry offers rapid cell characterization.
  • Bacterial membrane changes due to heat affect electrical properties.
  • Understanding these changes is crucial for viability assessment.

Purpose of the Study:

  • To investigate how medium conductivity and heat exposure time influence the viability classification of heat-treated E. coli using impedance flow cytometry.
  • To correlate theoretical models of membrane perforation with experimental impedance measurements.
  • To determine optimal conditions for distinguishing between untreated and heat-treated E. coli.

Main Methods:

  • Theoretical modeling of bacterial cell impedance changes post-heat treatment.
  • Experimental impedance measurements on E. coli samples.
  • Varying suspending medium conductivity and heat exposure durations.
  • Analysis of the differential argument of complex electrical current.

Main Results:

  • Heat exposure causes bacterial membrane perforation, altering cell impedance.
  • This alteration shifts the differential argument of the complex electrical current.
  • Increased heat exposure time and decreased medium conductivity enhance classification accuracy.
  • Optimal classification was achieved at 0.045 S/m medium conductivity after 30 min heat exposure.

Conclusions:

  • Impedance flow cytometry can effectively classify heat-treated E. coli viability.
  • Medium conductivity and heat exposure time are critical parameters for accurate classification.
  • The study provides a foundation for optimizing impedance flow cytometry for bacterial viability assessment.