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As one of the main non-covalent relations in microbiological-based systems, cell surface hydrophobicity (CSH) can be observed as a relevant parameter for biodegradation capability and suggested bacterial behaviour and biofilm formation during a bioremediation process. On the other hand, the role of ureolytic bacteria in bioremediation has subsequently led to the examination of this bacterial type in different engineering fields. In order to optimize the operating parameters of microbial adhesion to hydrocarbons test (MATH) for ureolytic bacteria, Box-Behnken experimental design was conducted for five ureolytic bacteria isolated from soils as well as the reference strain Sporosarcina pasteurii DSM 33. The optimization was completed with and without essential substrate for targeted metabolic reaction, with the aim to compare differences in bacterial hydrophobicity. The vortex time of 2 minutes, hydrocarbon volume of 0.5 mL, and phase separation time of 15 minutes are recommended as MATH operating parameters for all tested ureolytic bacteria. Although all bacteria are hydrophobic, lower CSH values in urea presence were observed for the same bacterium which can be explained by the interaction of urea with organic phase of the separation system as well as rapid ureolysis process which also occurs during ureolytic bacteria application in biotechnology systems.

Operating parameter optimization of cell surface hydrophobicity test for ureolytic bacteria