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A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues
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Fluorescence characterization of clinically-important bacteria.

Lewis R Dartnell1, Tom A Roberts, Ginny Moore

  • 1UCL Institute for Origins, University College London, London, United Kingdom ; The Centre for Planetary Sciences at UCL/Birkbeck, University College London, London, United Kingdom.

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Summary

This study introduces a novel fluorescence detection instrument for identifying bacterial contamination in hospitals. The system targets tryptophan fluorescence, offering a rapid method to prevent healthcare-associated infections (HCAI/HAI).

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Area of Science:

  • Biomedical Engineering
  • Microbiology
  • Clinical Diagnostics

Background:

  • Healthcare-associated infections (HCAI/HAI) pose significant risks and costs in clinical settings.
  • Current surveillance methods for HCAI/HAI lack rapid, macroscale detection capabilities.
  • Native fluorescence of cellular molecules offers a promising avenue for early bacterial contamination detection.

Purpose of the Study:

  • To develop and specify a fluorescence-based detection instrument for macroscale surveillance of bacterial contamination in healthcare facilities.
  • To characterize the fluorescence response of clinically relevant bacteria and assess potential background interference from common hospital surfaces and materials.

Main Methods:

  • Characterization of fluorescence responses of eleven clinically-relevant bacteria using excitation-emission matrices (EEMs).
  • Analysis of background fluorescence from various hospital surfaces (bedrails, keyboards) and cleaning materials.
  • Identification of optimal excitation and emission wavelengths for bacterial detection.

Main Results:

  • All bacterial strains exhibited a distinctive tryptophan-associated double-peak fluorescence signature.
  • An optimal detection signal was identified at 340nm emission with 280nm excitation.
  • Most hospital materials showed a spectral window for detection, though some background fluorescence interference was noted.

Conclusions:

  • A fluorescence-based detection method targeting tryptophan is effective for identifying bacterial contamination.
  • The developed instrument specifications and characterization data support its potential for preventing HCAI/HAI outbreaks.
  • Further development may be needed to overcome background fluorescence challenges with specific materials like microfiber cloths.