Spores from mesophilic Bacillus cereus strains germinate better and grow faster in simulated gastro-intestinal conditions than spores from psychrotrophic strains

The species Bacillus cereus, known for its ability to cause food borne disease, consists of a large variety of strains. An important property for discrimination of strains is their growth temperature range. Psychrotrophic strains can grow well at refrigerator temperatures but grow at 37 °C with diff...

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Bibliographic Details
Published in:International journal of food microbiology 2006-11, Vol.112 (2), p.120-128
Main Authors: Wijnands, L.M., Dufrenne, J.B., Zwietering, M.H., van Leusden, F.M.
Format: Article
Language:English
Subjects:
acid tolerance
Bacillus cereus
Bacillus cereus - growth & development
Bacillus cereus - physiology
bacterial contamination
bacterial spores
Biological and medical sciences
Colony Count, Microbial
culture media
Culture Media - chemistry
digestive juices
emetics
Food Handling - methods
Food industries
Food Microbiology
food pathogens
Foodborne Diseases - prevention & control
foodborne illness
Fundamental and applied biological sciences. Psychology
gastric juice
gastrointestinal system
heat tolerance
Hydrogen-Ion Concentration
Mesophilic
Psychrotrophic
psychrotrophic bacteria
risk factors
Simulated gastro-intestinal conditions
spore germination
spore-forming bacteria
Spores, Bacterial - growth & development
Temperature
Time Factors
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Summary:The species Bacillus cereus, known for its ability to cause food borne disease, consists of a large variety of strains. An important property for discrimination of strains is their growth temperature range. Psychrotrophic strains can grow well at refrigerator temperatures but grow at 37 °C with difficulty. Mesophilic strains on the other hand are unable to grow below 10 °C, but grow well at 37 °C. Spores of six psychrotrophic and six mesophilic strains were investigated for their ability to survive and grow in simulated gastro-intestinal fluids, mimicking the conditions in the gastro-intestinal tract. The germination potential of psychrotrophic and mesophilic spores in simulated intestinal fluid does not differ much. Under conditions simulating the gastro-intestinal passage, 5 out of 6 mesophilic strains showed growth, and only 2 out of 6 psychrotrophic strains. Temperature (37 °C) and simulated gastro-intestinal conditions together influenced germination and growth.
ISSN:0168-1605
1879-3460
DOI:10.1016/j.ijfoodmicro.2006.06.015