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

L.M. Wijnands, J.B. Dufrenne, M.H. Zwietering, F.M. van Leusden

Research output: Contribution to journalArticleAcademicpeer-review

46 Citations (Scopus)

Abstract

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
Original languageEnglish
Pages (from-to)120-128
JournalInternational Journal of Food Microbiology
Volume112
Issue number3
DOIs
Publication statusPublished - 2006

Keywords

  • hemolysin bl
  • enterotoxin
  • foods
  • psychrotolerant
  • enumeration
  • stability
  • healthy
  • cells
  • women
  • men

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