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Journal of Dairy Science Vol. 83 No. 4 641-647
© 2000 by American Dairy Science Association ®
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Preliminary Observations on Influence of Dairy Products on Biofilm Removal from Silicone Rubber Voice Prostheses in vitro

H. J. Busscher 1, R. H. Free 2, R. Van Weissenbruch 2, F.W.J. Albers 2, and H. C. Van Der Mei 1

1 Department of Biomedical Engineering, University of Groningen, Bloemsingel 10, 9712 KZ Groningen, The Netherlands
2 Department of Otorhinolaryngology, University Hospital Groningen, Hanzeplein 1, 9713 EZ Groningen, The Netherlands

We determined oropharyngeal biofilm removal from silicone rubber voice prostheses in an artificial throat after perfusion with different commercially available dairy products, including buttermilk, Lactobacillus casei Shirota fermented milk (Yakult, Yakult Netherlands BV, Almere, The Netherlands), low-fat milk, and three types of yogurt. Buttermilk removed both yeasts and bacteria from biofilms on voice prostheses, but this was not observed with a pasteurized buttermilk product. Some of the other products, most notably Yakult fermented milk drink, reduced the number of bacteria, whereas growth of yeasts in the biofilms was not inhibited. This study demonstrates that there may be health benefits associated with the consumption of certain dairy products when applied to the upper digestive tract.

Key Words: dairy products • biofilm • voice prosthesis • probiotics

Submitted on May 28, 1999
Accepted on November 4, 1999






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