Rapid Detection and Identification of Vancomycin-Sensitive Bacteria Using an Electrochemical Apta-Sensor

Area of Science:

• Electrochemistry
• Biosensor Technology
• Microbiology

Background:

• Current bacterial detection methods are time-consuming and costly.
• Efficient diagnostics are crucial for combating diverse bacterial infections.

Purpose of the Study:

• Develop a novel portable electrochemical biosensor for rapid Gram-positive bacteria detection and identification.
• Overcome limitations of traditional bacterial analysis techniques.

Main Methods:

• Utilized vancomycin-modified screen-printed carbon electrodes for selective bacterial capture.
• Employed aptamers for species-specific bacterial identification.
• Analyzed results using electrochemical impedance spectroscopy, scanning electron microscopy, and differential pulse voltammetry.

Main Results:

• Achieved selective capture of Gram-positive bacteria in 10 minutes with a limit of detection of 2 CFU/mL.
• Successfully identified *Staphylococcus aureus* and *Bacillus cereus* in untreated milk and serum within 45 minutes.
• Demonstrated high sensitivity with detection of 100 CFU/mL of target bacteria.

Conclusions:

• The developed biosensor offers rapid, sensitive, and specific detection and identification of Gram-positive bacteria.
• This portable device has potential applications in clinical diagnostics, food safety, environmental monitoring, and security.
• The biosensor can be operated by inexperienced staff, broadening its accessibility.