1. Short communication: Pasteurization as a means of inactivating staphylococcal enterotoxins A, B, and C in milk
- Author
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Katerina Bartova, Danka Haruštiaková, Lenka Necidová, and Katerina Bogdanovicova
- Subjects
0301 basic medicine ,Staphylococcus aureus ,Hot Temperature ,Staphylococcal Enterotoxins ,030106 microbiology ,Pasteurization ,Food Contamination ,medicine.disease_cause ,complex mixtures ,Microbiology ,law.invention ,03 medical and health sciences ,Enterotoxins ,law ,parasitic diseases ,Genetics ,Medicine ,Animals ,Food science ,Incubation ,Plate method ,biology ,business.industry ,bacterial infections and mycoses ,biology.organism_classification ,Milk production ,humanities ,030104 developmental biology ,Milk ,Food Microbiology ,Animal Science and Zoology ,business ,Bacteria ,Food Analysis ,Food Science - Abstract
Our aim was to assess the effect of pasteurization temperature on inactivation of staphylococcal enterotoxins (SE). Milk samples were inoculated with log 4.38 to 5.18 cfu/mL of 40 different Staphylococcus aureus strains having the ability to produce types A, B, or C SE and incubated at 37°C for 24 h to develop SE. This incubation was followed by heat treatment for 15 s at 72, 85, and 92°C. Samples were analyzed for Staph. aureus count by plate method and, specifically, for SE presence. An enzyme-linked immunofluorescent assay on a MiniVIDAS analyzer (bioMerieux, Marcy l’Etoile, France) was used to detect SE, which were determined semiquantitatively based on test values. The Staph. aureus count in milk before pasteurization did not affect the amount of SE. Before pasteurization, SEB was detected in the lowest amount compared with other SE types. Staphylococcal enterotoxins were markedly reduced with pasteurization and inactivated at pasteurization temperatures to an extent depending on the amount in the sample before pasteurization. After pasteurization at 72°C, SE were detected in 87.5% of samples (35/40), after pasteurization at 85°C in 52.5% of samples (21/40), and after pasteurization at 92°C in 45.0% of samples (18/40). We determined that SE may still persist in milk even when Staph. aureus bacteria are inactivated through pasteurization. Although pasteurization may partially inactivate SE in milk, a key measure in the prevention of staphylococcal enterotoxicosis linked to pasteurized milk consumption is to avoid any cold chain disruption during milk production and processing.
- Published
- 2016