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Bacterial Detection & Identification Using Electrochemical Sensors
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Bacterial Concentration Detection using a PCB-based Contactless Conductivity Sensor.

Xiao-Yan Zhang1, Zhe-Yu Li2, Yu Zhang3

  • 1State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China. xyzhang774985529@163.com.

Micromachines
|January 17, 2019
PubMed
Summary
This summary is machine-generated.

A new printed-circuit-board based capacitively coupled contactless conductivity detection (C⁴D) device offers a simple, safe, and accurate method for bacterial counting. This C⁴D approach ensures high bacterial viability and precise measurements without high-pressure pumps.

Keywords:
E. colibacterial concentrationcapacitively coupled contactless conductivity detection (C4D)capillaryprinted-circuit-board (PCB)

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Area of Science:

  • Biosensing
  • Electrical Engineering
  • Microbiology

Background:

  • Traditional bacterial counting methods like plate counts are labor-intensive and time-consuming.
  • Flow cytometry (FCM) is accurate but requires expensive equipment.
  • Existing methods can impact bacterial viability and require high-pressure systems.

Purpose of the Study:

  • To develop a novel printed-circuit-board (PCB)-based capacitively coupled contactless conductivity detection (C⁴D) device.
  • To improve upon existing bacterial counting techniques by enhancing simplicity, safety, and accuracy.
  • To provide a cost-effective and non-destructive method for bacterial quantification.

Main Methods:

  • Development of an electrode-integrated PCB-based C⁴D device.
  • Utilized C⁴D for bacterial detection without a syringe pump, reducing system size and pressure effects.
  • Validated bacterial viability post-detection using flow cytometry (FCM).

Main Results:

  • The C⁴D device demonstrated high sensitivity and repeatability.
  • Bacterial viability remained above 96% after C⁴D detection.
  • Linear measurement range from 10⁶ to 10⁸ cells/mL with a relative standard deviation (RSD) below 0.2% was achieved.
  • Effects of background solutions on bacteria and C⁴D were analyzed.

Conclusions:

  • The novel PCB-based C⁴D device offers a simple, safe, and accurate alternative for bacterial counting.
  • This method preserves bacterial viability, unlike some high-pressure techniques.
  • The C⁴D approach provides a potential solution for in situ detection of bacterial cultures, overcoming limitations of traditional methods.