Title
Survival, elongation, and elevated tolerance of Salmonella enterica serovar enteritidis at reduced water activity
Author
TNO Defensie en Veiligheid
Kieboom, J.
Kusumaningrum, H.D.
Tempelaars, M.H.
Hazeleger, W.C.
Abee, T.
Beumer, R.R.
Publication year
2006
Abstract
Growing microorganisms on dry surfaces, which results in exposure to low water activity (aw), may change their normal morphology and physiological activity. In this study, the morphological changes and cell viability of Salmonella enterica serovar Enteritidis challenged to low a w were analyzed. The results indicated that exposure to reduced aw induced filamentation of the cells. The amount of filamentous cells at aw 0.94 was up to 90% of the total number of cells. Surviving filamentous cells maintained their membrane integrity after exposure to low aw for 21 days. Furthermore, cells prechallenged to low a w, obtained with an ionic humectant, demonstrated higher resistance to sodium hypochlorite than control cells. These resistant cells are able to survive disinfection more efficiently and can therefore cause contamination of foods coming in contact with surfaces. This points to the need for increased attention to cleaning of surfaces in household environments and disinfection procedures in processing plants. Copyright ©, International Association for Food Protection.
Subject
Disinfectant agent
Bacterial count
Disinfection
Drug effect
Food contamination
Food control
Growth, development and aging
Human
Metabolism
Methodology
Microbial viability
Physiology
Safety
Time
Colony count, Microbial
Consumer product safety
Disinfectants
Disinfection
Food contamination
Food microbiology
Humans
Microbial viability
Salmonella enteritidis
Time factors
Salmonella enterica
Salmonella enteritidis
Hypochlorite sodium, 7681-52-9
Water, 7732-18-5
Sodium hypochlorite, 7681-52-9
To reference this document use:
http://resolver.tudelft.nl/uuid:9cb21861-1fe6-4c23-8695-71488f8dc54f
TNO identifier
239554
ISSN
0362-028X
Source
Journal of Food Protection, 69 (69), 2681-2686
Document type
article