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Bacterial Survival on Cornstarch-Containing Polyethylene Film Held Under Food Storage Conditions
1Department of Food Science and Nutrition, University of Minnesota, 1334 Eckles Avenue, St. Paul Minnesota 55108.
Journal of Food Protection
|May 16, 2019
Summary
Cornstarch-containing plastic films (CSPE) generally do not enhance bacterial survival. Microbiological evaluation indicates CSPE films are safe for food packaging applications.
Area of Science:
- Materials Science
- Microbiology
- Food Science
Background:
- Development of biodegradable plastics incorporating cornstarch into the polymer network.
- Need to evaluate the microbiological impact of these novel plastic films.
Purpose of the Study:
- To assess the effect of cornstarch-containing polyethylene film (CSPE) on the survival and growth of spoilage and pathogenic bacteria.
- To determine the suitability of CSPE films for food packaging from a microbiological perspective.
Main Methods:
- Inoculation of CSPE and control polyethylene (PE) films with Salmonella typhimurium, Aeromonas hydrophila, Bacillus cereus, and Pseudomonas fragi.
- Incubation of inoculated films under various temperature and relative humidity conditions simulating food storage.
- Bacterial enumeration from film samples and assessment of growth in supplemented minimal salts and complex media.
Main Results:
- Bacterial survival on CSPE films was generally not enhanced compared to PE films.
- Enhanced growth of S. typhimurium, A. hydrophila, and P. fragi occurred with CSPE-supplemented minimal salts medium under saturated humidity at specific temperatures.
- No significant enhanced growth was observed in nutritionally complex media supplemented with CSPE or PE.
Conclusions:
- Cornstarch-containing polyethylene films do not promote bacterial survival under typical food storage conditions.
- CSPE films show potential for safe food packaging, as enhanced growth was limited to specific media and conditions not representative of general food packaging.
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