Related Experiment Videos
Freezing: an underutilized food safety technology?
1Food Science and Human Nutrition Department, PO Box 110370, University of Florida, Gainesville, FL 32611-0370, USA. dlar@mail.ifas.ufl.edu
International Journal of Food Microbiology
|December 31, 2003
Summary
Freezing preserves food by stopping microbial growth, but some pathogens survive. Further research can improve freezing methods to reliably kill foodborne pathogens.
Area of Science:
- Food Science
- Microbiology
- Food Safety
Background:
- Freezing is a long-standing food preservation technology.
- It effectively inhibits spoilage microorganisms but does not eliminate all human pathogens.
- Frozen foods generally have a good safety record, with rare foodborne illness outbreaks linked to them.
Purpose of the Study:
- To investigate the mechanisms by which freezing affects microorganisms.
- To identify ways to enhance the pathogen-killing efficacy of freezing.
- To explore strategies for preventing the resuscitation of sublethally injured pathogens.
Main Methods:
- Literature review on the effects of freezing on microbial cells.
- Analysis of physical, chemical, and genetic interactions during freezing.
- Exploration of potential interventions to counteract microbial resistance.
Main Results:
- Commercial freezing kills some, but not all, human pathogens.
- Freezing induces physical, chemical, and possibly genetic changes in microorganisms.
- Pathogens may be sublethally injured, with potential for resuscitation.
Conclusions:
- More research is needed to understand freezing's effects on microbial cells within food matrices.
- Investigating methods to prevent pathogen resuscitation post-freezing is crucial.
- Future research may enable freezing to reliably reduce foodborne pathogens and improve food preservation.