Abstract
The aim of this study was to evaluate the prevalence of antibiotic-resistant staphylococci in frozen vegetables during long-term storage of these products. The vegetables were subjected to freezing at −40 °C (fluidisation technique). Experimental temperature values in frozen tissues reached −18 °C. Vegetables were packed in polyethylene airtight bags. The study involved 33 assortments of frozen vegetables. The number of Staphylococcus aureus in frozen vegetables achieved 3.5 log10 CFU/g; 4.7% of these samples showed unacceptable microbial counts. The maximum level of methicillin-resistant S. aureus was 4.25 log10 CFU/g. All samples showed also the presence of aerobic bacteria without correlation between their number and staphylococci counts. On these bases, the Regulation (EC) No. 2073/2005, recently amended in 2007, could be modified with a condition concerning the absence of S. aureus in vegetable products ready for frozen storage because of the possible detection or the presence of methicillin-resistant S. aureus in final products.
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Abbreviations
- CFU:
-
Colony Forming Unit
- MR:
-
Methicillin resistant
- MRSA:
-
Methicillin-resistant Staphylococcus aureus
- MSSA:
-
Methicillin-sensitive S. aureus
- MSSA:
-
Methicillin-susceptible S. aureus
- MDRA:
-
Multidrug-resistant S. aureus
- PE:
-
Polyethylene
- RH:
-
Relative humidity
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Steinka, I., Barone, C., Parisi, S., Micali, M. (2017). Antibiotic-Resistant Staphylococci Isolated from Hermetically Packaged Frozen Vegetables. In: The Chemistry of Frozen Vegetables. SpringerBriefs in Molecular Science(). Springer, Cham. https://doi.org/10.1007/978-3-319-53932-4_1
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