Bacterial detection using unlabeled phage amplification and mass spectrometry through structural and nonstructural...

Area of Science:

• Food safety
• Microbiology
• Analytical Chemistry

Background:

• Food safety is a critical public health concern, necessitating sensitive and rapid bacterial detection methods.
• Current methods for bacterial detection in food can be time-consuming and labor-intensive.

Purpose of the Study:

• To demonstrate the feasibility of an indirect, specific bacterial detection method in food samples.
• To develop a rapid and sensitive assay for bacterial detection using phage amplification and mass spectrometry.

Main Methods:

• Utilized unlabeled phage amplification coupled with Electrospray Ionization (ESI) mass spectrometry.
• Employed high-resolving power mass spectrometry for identifying specific phage infection markers (structural and nonstructural proteins).
• Performed targeted detection using a triple quadrupole mass spectrometer in selected reaction monitoring mode.

Main Results:

• Successfully detected Escherichia coli (E. coli) at concentrations of 1x10^5 to 1x10^6 CFU/mL within 2 hours.
• Detection was achieved in various food matrices including broth, orange juice, and stew.
• Demonstrated reproducible detection of both structural and nonstructural phage markers.

Conclusions:

• The developed phage amplification and mass spectrometry strategy offers a highly time-effective and sensitive assay for bacterial detection in food.
• This method holds significant potential for enhancing food safety monitoring and public health protection.