A multimetallic nanozyme enhanced colorimetric biosensor for Salmonella detection on finger-actuated microfluidic...

Area of Science:

• Food safety
• Biosensor technology
• Microfluidics

Background:

• Salmonella contamination poses a significant risk of foodborne illness.
• Accurate and rapid detection methods are crucial for public health and food safety.
• Existing methods can be time-consuming or require complex laboratory equipment.

Purpose of the Study:

• To develop a simple, fast, and sensitive colorimetric biosensor for Salmonella detection.
• To integrate this biosensor onto a microfluidic chip for efficient sample handling and analysis.
• To provide a user-friendly, portable solution for on-site Salmonella screening.

Main Methods:

• Development of a microfluidic chip with precise air control and fluid selection mechanisms.
• Utilized immune gold@platinum palladium nanocatalysts for signal amplification.
• Employed magnetic nanobeads for bacteria capture, enrichment, and separation.
• Colorimetric detection of Salmonella by catalyzing a substrate into a colored product.

Main Results:

• The developed biosensor achieved sensitive Salmonella detection at 45 CFU/mL.
• The entire detection process was completed within 25 minutes.
• The finger-actuated microfluidic chip allowed for easy operation without external power.
• High specificity and sensitivity were demonstrated for Salmonella detection.

Conclusions:

• The developed microfluidic colorimetric biosensor is a promising tool for rapid and sensitive Salmonella detection.
• This technology can significantly contribute to preventing food poisoning outbreaks.
• The portable and user-friendly design facilitates its application in various settings for food safety monitoring.