Related Experiment Videos
Summary
Enterococci bacteria are commonly found on eggshells and can survive various processing methods. Their resilience makes producing enterococci-free egg products challenging in standard production lines.
Area of Science:
- Food Microbiology
- Food Safety
- Bacteriology
Background:
- Enterococci bacteria have been detected in dried and frozen egg products.
- Understanding their origin and behavior during egg processing is crucial for food safety.
Purpose of the Study:
- To investigate the origin and behavior of enterococci during egg processing.
- To assess the effectiveness of different processing steps in eliminating enterococci.
Main Methods:
- Surveying enterococci on unwashed and washed eggshells from Japan.
- Examining enterococci contamination in egg contents.
- Testing enterococci resistance to disinfectants, temperature, frozen storage, pasteurization, spray-drying, and glucose oxidase treatment.
Main Results:
- Enterococci were prevalent on unwashed eggshells (avg. 60 per egg), with lower numbers on washed eggs.
- Streptococcus faecalis and S. faecalis var. liquefaciens were the dominant species.
- Enterococci showed resistance to disinfectants, mild temperatures, frozen storage, and pasteurization, but were eliminated by glucose oxidase treatment and slightly reduced by spray-drying.
Conclusions:
- Enterococci contamination originates from eggshells and persists through several processing stages.
- Standard egg processing methods are insufficient for complete enterococci elimination.
- Producing enterococci-free egg products requires specialized interventions beyond normal production lines.