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Applied and Environmental Microbiology, June 2009, p. 4089-4092, Vol. 75, No. 12
0099-2240/09/$08.00+0     doi:10.1128/AEM.02807-08
Copyright © 2009, American Society for Microbiology. All Rights Reserved.

Effect of Octenidine Hydrochloride on Planktonic Cells and Biofilms of Listeria monocytogenes{triangledown}

Mary Anne Roshni Amalaradjou,1 Carol E. Norris,2 and Kumar Venkitanarayanan1*

Department of Animal Science,1 Department of Molecular and Cell Biology, University of Connecticut, Storrs, Connecticut 062692

Received 10 December 2008/ Accepted 4 April 2009

Listeria monocytogenes is a food-borne pathogen capable of forming biofilms and persisting in food processing environments for extended periods of time, thereby potentially contaminating foods. The efficacy of octenidine hydrochloride (OH) for inactivating planktonic cells and preformed biofilms of L. monocytogenes was investigated at 37, 21, 8, and 4°C in the presence and absence of organic matter (rehydrated nonfat dry milk). OH rapidly killed planktonic cells and biofilms of L. monocytogenes at all four temperatures. Moreover, OH was equally effective in killing L. monocytogenes biofilms on polystyrene and stainless steel matrices in the presence and absence of organic matter. The results underscore OH's ability to prevent establishment of L. monocytogenes biofilms by rapidly killing planktonic cells and to eliminate preformed biofilms, thus suggesting that it could be used as a disinfectant to prevent L. monocytogenes from persisting in food processing environments.

* Corresponding author. Mailing address: Department of Animal Science, Unit 4040, 3636 Horsebarn Hill Road Extension, Storrs, CT 06269. Phone: (860) 486-0947. Fax: (860) 486-4375. E-mail: Kumar.venkitanarayanan{at}uconn.edu

{triangledown} Published ahead of print on 17 April 2009.

Applied and Environmental Microbiology, June 2009, p. 4089-4092, Vol. 75, No. 12
0099-2240/09/$08.00+0     doi:10.1128/AEM.02807-08
Copyright © 2009, American Society for Microbiology. All Rights Reserved.





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