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Biofilm Formation of the Facultative Thermophile Bacillus pumilus D194A and Affects of Sanitation Agents on Its Biofilms

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Abstract

Bacillus pumilus D194a formed a strong biofilm on 96-well polystyrene microtiter plates and stainless-steel surfaces. Its optimum environmental factors for growth were determined as 50°C, pH 6.0, 1.5% NaCl for 48 h, whereas, the optimum biofilm formation was measured at 50°C, pH 8.0, 0% NaCl. The isolate was observed to have peritrichous flagella and it produced rigid pellicle. Extracellular polymeric substances (EPSs) of this strain were also determined to be; carbohydrate (33.5 µg/mL), protein (790 µg/mL) and extracellular DNA (eDNA) (18.5 kb). D194a cells formed biofilms on many abiotic surfaces, such as glass, polystyrene, stainless steel, polyvinyl chloride, polycarbonate, polypropylene, wherein polycarbonate (6.23 log/cm2) and polypropylene (6.14 log/cm2) were the generally preferred ones. Biofilm samples were treated with 15 different sanitation agents, including sodium metaperiodate (96.83%), nisin (93.82%), trichloroacetic acid (93.66%) and lysozyme (94.1%) for sanitation purposes. The elimination of eDNA in its 2 h-biofilm with DNase I was 98.48%, while this results was found as 96.06% for its 12 h-mature biofilm. In conclusion, this research demonstrated that B. pumilus D194a is a strong biofilm producer with a rigid structure harboring high protein and eDNA content, which cannot be easily destroyed by various chemical agents.

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Funding

This research was supported by the Scientific Research Project Office of Ankara University (project number 11B4240003).

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Correspondence to T. Kilic.

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Kilic, T., Coleri Cihan, A. Biofilm Formation of the Facultative Thermophile Bacillus pumilus D194A and Affects of Sanitation Agents on Its Biofilms. Microbiology 89, 64–73 (2020). https://doi.org/10.1134/S0026261720010087

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Keywords:

  • Bacillus pumilus D194a
  • biofilm formation
  • biofilm control