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Survival of Escherichia coli O157:H7 in frozen foods: impact of the cold shock response
- Source :
- International Journal of Food Microbiology. 64:127-138
- Publication Year :
- 2001
- Publisher :
- Elsevier BV, 2001.
-
Abstract
- The survival of Escherichia coli O157:H7 strains in both frozen foods and trypticase soy broth (TSB) was investigated following cold shocking at 10 degrees C for 1.5 h. Using both trypticase soy agar (TSA) and violet red bile agar (VRBA) as recovery media, it was demonstrated that survival levels between cold shocked (CS) and non-cold shocked (NS) E. coli in ground beef or pork were not significantly different (P < or = 0.05). In contrast, cold shocking E. coli in either milk, whole egg or sausage resulted in a significant(P < or = 0.05) enhancement in survival. For milk, survival levels of CS E. coli, by 28 days of frozen storage, were 1.89 and 1.66 log10 cfu/ml higher on TSA and VRBA, respectively, when compared to NS cells. In egg these values were 0.64 and 1.31, while in sausage, values of 0.74 and 1.19 were obtained. In TSB (pH 7) survival of CS E. coli for some strains was about 3 log10 cfu/ml higher when compared to NS cells. Acidification of TSB (pH 5), however, appeared to negate the protective effects of the cold shock treatment. In milk, increasing the differential between the growth and cold shock temperatures resulted in higher numbers of survivors. In this regard the growth-cold shock temperature protocol giving optimum protection was 37-10 degrees C. In contrast, growth of E. coli at 20 degrees C followed by cold shocking at 10 degrees C did not result in any significant freeze protection. In addition, increased protection due to cold shocking was correlated with the appearance of a novel protein appearing at pI 4.8 following isoelectric focusing analysis, thus demonstrating an alteration of protein synthesis.
- Subjects :
- Meat
Time Factors
food.ingredient
Survival
Eggs
Colony Count, Microbial
Escherichia coli O157
medicine.disease_cause
Shelf life
Microbiology
chemistry.chemical_compound
food
Bacterial Proteins
Food Preservation
medicine
Animals
Food microbiology
Agar
Trypticase soy agar
Food science
Escherichia coli
biology
Temperature
Food preservation
General Medicine
biology.organism_classification
Enterobacteriaceae
Culture Media
Cold shock response
Cold Temperature
Meat Products
Milk
chemistry
Food Microbiology
Frozen Foods
Food Science
Subjects
Details
- ISSN :
- 01681605
- Volume :
- 64
- Database :
- OpenAIRE
- Journal :
- International Journal of Food Microbiology
- Accession number :
- edsair.doi.dedup.....834e5056efe719779f39c141d4923941
- Full Text :
- https://doi.org/10.1016/s0168-1605(00)00463-3