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Assessment of a regulatory sanitization process in Egyptian dairy plants in regard to the adherence of some food-borne pathogens and their biofilms
Faculty
Veterinary Medicine
Year:
2012
Type of Publication:
Article
Pages:
225-231
Authors:
Kamal, Rania M, Bayoumi, Mohamed A, Abd El Aal, Salah F, Awad, Esmat I
DOI:
10.1016/j.ijfoodmicro.2012.07.021
Journal:
INTERNATIONAL JOURNAL OF FOOD MICROBIOLOGY ELSEVIER SCIENCE BV
Volume:
158
Research Area:
Food Science \& Technology; Microbiology
ISSN
ISI:000309195700007
Keywords :
Biofilm, Food contact surfaces, Food-borne pathogens, Microbial adherence
Abstract:
Food-borne pathogens may develop certain strategies that enable them to defy harsh conditions such as chemical sanitization. Biofilm formation represents a prominent one among those adopted strategies, by which food-borne pathogens protect themselves against external threats. Thus, bacterial biofilm is considered as a major hazard for safe food production. This study was designed to investigate the adherence and the biofilm formation ability of some food-borne pathogens on stainless steel and polypropylene surfaces using chip assay, and to validate regular sanitizing process (sodium hypochlorite 250 mg/L) for effective elimination of those pathogens. Sixteen pathogenic bacterial strains, previously isolated from raw milk and dairy products at Zagazig city, Egypt (9 Staphylococcus aureus, 4 Cronobacter sakazakii and 3 Salmonella enterica serovar Typhimurium), were chosen for this study. Strains showed different patterns of adherence and biofilm formation on tested surfaces with minor significance between surfaces. The ability of sodium hypochlorite to completely eradicate either adhered or biofilm-embedded pathogens varied significantly depending on the strain and type of surface used. Whilst, sodium hypochlorite reduced tested pathogens counts per cm(2) of produced biofilms, but it was not able to entirely eliminate neither them nor adherent Cronobacter sakazakii to stainless steel surface. This study revealed that biofilm is considered as a sustainable source of contamination of dairy products with these pathogens, and also emphasized the need of paying more attention to the cleaning and sanitizing processes of food contact surfaces. (C) 2012 Elsevier B.V. All rights reserved.
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