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Applied and Environmental Microbiology, March 2007, p. 1481-1488, Vol. 73, No. 5
0099-2240/07/$08.00+0     doi:10.1128/AEM.01781-06
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Air-Liquid Interface Biofilms of Bacillus cereus: Formation, Sporulation, and Dispersion{triangledown}

Janneke G. E. Wijman,1,2 Patrick P. L. A. de Leeuw,1,3 Roy Moezelaar,1,3 Marcel H. Zwietering,2 and Tjakko Abee1,2*

Wageningen Centre for Food Sciences, Wageningen, The Netherlands,1 Laboratory of Food Microbiology, Wageningen University, Wageningen, The Netherlands,2 Food Technology Centre, Wageningen University and Research Centre, Wageningen, The Netherlands3

Received 27 July 2006/ Accepted 22 December 2006

Biofilm formation by Bacillus cereus was assessed using 56 strains of B. cereus, including the two sequenced strains, ATCC 14579 and ATCC 10987. Biofilm production in microtiter plates was found to be strongly dependent on incubation time, temperature, and medium, as well as the strain used, with some strains showing biofilm formation within 24 h and subsequent dispersion within the next 24 h. A selection of strains was used for quantitative analysis of biofilm formation on stainless steel coupons. Thick biofilms of B. cereus developed at the air-liquid interface, while the amount of biofilm formed was much lower in submerged systems. This suggests that B. cereus biofilms may develop particularly in industrial storage and piping systems that are partly filled during operation or where residual liquid has remained after a production cycle. Moreover, depending on the strain and culture conditions, spores constituted up to 90% of the total biofilm counts. This indicates that B. cereus biofilms can act as a nidus for spore formation and subsequently can release their spores into food production environments.

* Corresponding author. Mailing address: Wageningen University, Laboratory of Food Microbiology, Bomenweg 2, 6703 HD Wageningen. The Netherlands. Phone: 31 317484981. Fax: 31 317484978. E-mail: tjakko.abee{at}wur.nl.

{triangledown} Published ahead of print on 5 January 2007.

Applied and Environmental Microbiology, March 2007, p. 1481-1488, Vol. 73, No. 5
0099-2240/07/$08.00+0     doi:10.1128/AEM.01781-06
Copyright © 2007, American Society for Microbiology. All Rights Reserved.





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