Abstract
The effect of different cultivation temperatures (30 and 37 °C) and pH of the media (5.5, 7.5, 8.5) on the biofilm production was compared in Pseudomonas aeruginosa, Klebsiella pneumoniae, and Vibrio cholerae non-O1 and O1 using the crystal-violet test for estimation of quantitative production of the biofilm. Decrease (46.4–98.4 %) in the biofilm production was observed at 37 °C in 8 of the tested strains (P. aeruginosa three strains, K pneumoniae two, V. cholerae non-O1 two, and V. cholerae O1 one strain) compared with the production at 30 °C. On the other hand, five strains (P. aeruginosa 1, K. pneumoniae 3, V. cholerae non-O1 1) exhibited under these conditions a higher biofilm production (103–143 %). However, this difference was not significant (p = 0.196). Increased pH lead to a higher biofilm production using all media tested. In P. aeruginosa the biofilm production at pH 8.5 was 139–244 %, at pH 7.5 136–164 % in comparison with pH 5.5. Similarly, in K. pneumoniae the biofilm production increased to 151–319 % at pH 8.5 while with the drop of pH to 7.5 the biofilm production was 113–177 % compared with pH 5.5. In V. cholerae non-O1 and O1 the biofilm production reached 204–329 % at pH 8.5, and 123–316 % at pH 7.5 (compared with the production at pH 5.5). An increase in biofilm production represented an average of 169 % (p = 0.001) at pH change from 5.5 to 7.5, with the rise of pH from 5.5 to 8.5 caused an average difference of 229 % (p = 0.001).
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Hoštacká, A., Čižnár, I. & Štefkovičová, M. Temperature and pH affect the production of bacterial biofilm. Folia Microbiol 55, 75–78 (2010). https://doi.org/10.1007/s12223-010-0012-y
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DOI: https://doi.org/10.1007/s12223-010-0012-y