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Related Concept Videos

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Microbial biosensors are analytical devices that utilize living microbes to detect specific substances through measurable signals. These devices consist of two main components: biosensing organisms and signal-transducing elements. Biosensing organisms, such as Escherichia coli or Saccharomyces cerevisiae, are typically housed in multiwell plates connected to transducers, enabling rapid, real-time detection of target analytes.Signal Generation MechanismWhen a target analyte—such as...
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Cantilever Sensors for Rapid Optical Antimicrobial Sensitivity Testing.

Isabel Bennett1,2, Alice L B Pyne1,3, Rachel A McKendry1,2

  • 1London Centre for Nanotechnology, University College London, 17-19 Gordon Street, London WC1H 0AH, United Kingdom.

ACS Sensors
|September 9, 2020
PubMed
Summary

A new cantilever sensor detects antimicrobial resistance (AMR) in bacteria within 45 minutes. This rapid phenotypic antibiotic sensitivity testing (AST) method offers a faster alternative to current diagnostics.

Keywords:
antibioticsantimicrobial resistancebacteriacantileversdiagnosticsoptical

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Area of Science:

  • Biomedical Engineering
  • Microbiology
  • Sensor Technology

Background:

  • Antimicrobial resistance (AMR) poses a significant global health threat.
  • Current phenotypic antibiotic sensitivity testing (AST) methods are slow (12-24 hours).
  • Existing rapid AST methods using nanomechanical cantilevers face challenges with bacterial immobilization.

Purpose of the Study:

  • To develop a rapid, reliable phenotypic method for antibiotic sensitivity testing (AST).
  • To detect antimicrobial resistance (AMR) in bacteria within approximately 45 minutes.
  • To establish a basis for a fast diagnostic tool to combat AMR.

Main Methods:

  • A novel cantilever-based sensor system utilizing a laser and detector.
  • Detection of single bacterial cells in media as they pass through a laser focus.
  • Measurement of bacterial growth (resistant) or death (sensitive) for phenotypic resistance detection.

Main Results:

  • Demonstrated detection of phenotypic antibiotic resistance in approximately 45 minutes.
  • Successfully detected resistance in both laboratory and clinical strains of *Escherichia coli* (*E. coli*).
  • The method does not require complex or variable bacterial immobilization.

Conclusions:

  • The developed cantilever sensor offers a simple and fast method for detecting bacterial antibiotic resistance.
  • This technique can significantly reduce the time for AST compared to current methods.
  • The findings support the development of a new diagnostic tool to mitigate the impact of AMR.