Quantification of vital adherent Streptococcus sanguinis cells on protein-coated titanium after disinfectant treatment

Astasov-Frauenhoffer, Monika and Braissant, Olivier and Hauser-Gerspach, Irmgard and Daniels, A. U. and Wirz, Dieter and Weiger, Roland and Waltimo, Tuomas. (2011) Quantification of vital adherent Streptococcus sanguinis cells on protein-coated titanium after disinfectant treatment. Journal of materials science. Materials in medicine, Vol. 22, H. 9. pp. 2045-2051.

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Official URL: http://edoc.unibas.ch/dok/A6006555

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The quantification of vital adherent bacteria is challenging, especially when efficacy of antimicrobial agents is to be evaluated. In this study three different methods were compared in order to quantify vital adherent Streptococcus sanguinis cells after exposure to disinfectants. An anaerobic flow chamber model accomplished initial adhesion of S. sanguinis on protein-coated titanium. Effects of chlorhexidine, Betadine®, Octenidol®, and ProntOral® were assessed by quantifying vital cells using Live/Dead BacLight?, conventional culturing and isothermal microcalorimetry (IMC). Results were analysed by Kruskal-Wallis one-way analysis of variance. Live/dead staining revealed highest vital cell counts (P > 0.05) and demonstrated dose-dependent effect for all disinfectants. Microcalorimetry showed time-delayed heat flow peaks that were proportioned to the remaining number of viable cells. Over 48 h there was no difference in total heat between treated and untreated samples (P < 0.05), indicating equivalent numbers of bacteria were created and disinfectants delayed growth but did not eliminate it. In conclusion, contrary to culturing, live/dead staining enables detection of cells that may be viable but non-cultivable. Microcalorimetry allows unique evaluation of relative disinfectant effects by quantifying differences in time delay of regrowth of remaining vital cells.
Faculties and Departments:03 Faculty of Medicine > Departement Zahnmedizin > Klinik Zahnerhaltung > Zahnerhaltung (Weiger)
UniBasel Contributors:Weiger, Roland
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Kluwer Academic Press
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:27 Mar 2014 13:13
Deposited On:27 Mar 2014 13:13

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