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Ultrasensitive detection of E. coli using bioinspired based platform.

Sawsan Almohammed1,2, Tristan Nolan3, Niamh Martin3

  • 1School of Physics, University College Dublin, Belfield, Dublin, D04 V1W8, Ireland. james.rice@ucd.ie.

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Summary

This study presents a new method combining surface-enhanced Raman spectroscopy (SERS) and electro-optics for rapid bacterial detection. The technique amplifies signals for highly sensitive pathogen identification.

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Area of Science:

  • Analytical Chemistry
  • Biophysics
  • Spectroscopy

Background:

  • Bacterial infections pose a significant global health threat, necessitating advanced detection technologies.
  • Current methods for bacterial detection can be time-consuming or lack sensitivity.
  • Rapid and accurate pathogen identification is crucial for effective treatment and infection control.

Purpose of the Study:

  • To develop and validate a novel biosensor for bacterial detection.
  • To enhance the sensitivity of surface-enhanced Raman spectroscopy (SERS) using an electro-optic technique.
  • To demonstrate label-free, near single-cell level pathogen detection.

Main Methods:

  • Utilized a metal-semiconductor substrate for signal amplification.
  • Applied an external electric field to activate the substrate and enhance SERS signals.
  • Validated the method using Gram-negative *Escherichia coli*.

Main Results:

  • Achieved a tenfold amplification of the SERS signal for *Escherichia coli* upon application of an electric field.
  • Demonstrated the efficacy of the electro-optic SERS approach for bacterial detection.
  • Confirmed near single-cell sensitivity in the proof-of-concept study.

Conclusions:

  • The developed electro-optic SERS biosensor offers a promising rapid and label-free method for bacterial detection.
  • This technology has the potential for highly sensitive pathogen identification.
  • The approach could significantly impact infectious disease diagnostics.