Flow-Cytometry-Based Method to Detect Escherichia coli and Shigella Spp. Using 16S rRNA-Based Probe

Area of Science:

• Food Science
• Microbiology
• Analytical Chemistry

Background:

• Foodborne illnesses are a significant public health concern, often caused by microbial contamination.
• Current methods for detecting Escherichia coli (E. coli) in food are time-consuming, requiring multiple culture steps and several days for results.
• There is a need for rapid, sensitive, and specific methods to ensure food safety.

Purpose of the Study:

• To develop and describe an improved, rapid detection method for E. coli in food using flow cytometry.
• To enhance sensitivity and specificity compared to traditional methods.
• To reduce the time-to-results (TTR) for E. coli detection.

Main Methods:

• Development of a flow cytometry-based detection assay for E. coli.
• Optimization of protocols for cell concentration determination, sample preparation, and flow cytometric analysis.
• Validation of the method's ability to detect low levels of E. coli in complex food matrices.

Main Results:

• The developed flow cytometry method demonstrates high sensitivity and specificity for E. coli detection.
• The method significantly reduces the time-to-results (TTR) compared to conventional culture-based methods.
• Successful detection of small numbers of E. coli in the presence of high concentrations of other bacteria was achieved.

Conclusions:

• Flow cytometry offers a rapid and effective alternative for detecting microbial contamination in food.
• This improved method can enhance food safety by enabling quicker identification of E. coli.
• The provided protocols facilitate the implementation of this advanced detection technique.