Ultrasensitive detection of E. coli using bioinspired based platform

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.