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Pathogenic Escherichia coli (E. coli) detection through tuned nanoparticles enhancement study.

Gargibala Satpathy1,2, Goutam Kumar Chandra3, E Manikandan4,5

  • 1Central Research Laboratory, Sree Balaji Medical College & Hospital (SBMCH), Bharath Institute for Higher Education & Research (BIHER), Bharath University, Chennai, Tamil Nadu, 600073, India.

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|February 11, 2020
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Summary

This study detects pathogenic Escherichia coli (E. coli) using fluorescence microscopy and Raman spectroscopy with nanomaterials. Gold nanoparticles (Au-NPs) enhanced detection, while zinc oxide nanoparticles (ZnO-NPs) inhibited bacterial growth.

Keywords:
BacteriaE. coliFluorescence spectroscopyGold and ZnO nanoparticlesPathogenRaman

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Area of Science:

  • Biotechnology
  • Microbiology
  • Nanotechnology

Background:

  • Pathogenic Escherichia coli (E. coli) poses a significant public health risk.
  • Accurate and rapid detection methods for E. coli are crucial for food safety and clinical diagnostics.
  • Non-destructive spectroscopic techniques offer potential for sensitive bacterial identification.

Purpose of the Study:

  • To detect pathogenic E. coli using non-destructive fluorescence microscopy and micro-Raman spectroscopy.
  • To investigate the utility of zinc oxide nanoparticles (ZnO-NPs) and gold nanoparticles (Au-NPs) as detection agents.
  • To correlate nanoparticle interactions with cellular changes for enhanced detection.

Main Methods:

  • Utilized fluorescence microscopy and micro-Raman spectroscopy for E. coli detection.
  • Synthesized and characterized ZnO-NPs and Au-NPs using SEM and EDAX.
  • Employed Au-NPs as contrast agents leveraging surface plasmon resonance (SPR).
  • Assessed cellular changes via fluorescence microscopy to correlate with NP interactions.

Main Results:

  • Raman spectroscopy provided biochemical insights into cellular changes.
  • Au-NPs, via SPR, enhanced signal intensity for improved E. coli detection.
  • SEM and EDAX confirmed NP morphology and elemental composition.
  • Fluorescence microscopy revealed changes in cell surface charge and stiffness upon NP interaction.

Conclusions:

  • ZnO-NPs inhibited E. coli growth by altering cell membrane permeability and metabolism.
  • Au-NPs significantly enhanced fluorescence detection of pathogenic E. coli strains.
  • Raman microscopy and elemental analysis indicated conformational changes in proteins, lipids, and DNA/RNA upon Au-NP interaction, distinguishing them from ZnO-NP effects.