Faculty of Biotechnology and Food Sciences in Nitra Journal of Microbiology, Biotechnology and Food Sciences 1338-5178 vol. 6 2016 2016-08-01 2016-08-01 RAPID AND SIMPLE DETERMINATION OF MINIMUM BIOFILM ERADICATION CONCENTRATION BY A COLORIMETRIC MICROBIAL VIABILITY ASSAY BASED ON REDUCTION OF A WATER-TETRAZOLIUM SALT AND COMBINATED EFFECT OF ANTIBIOTICS AGAINST MICROBIAL BIOFILM 677 680 EN Tadayuki Tsukatani Tadayuki Tsukatani Tomoaki Kawaguchi Tomoaki Kawaguchi Hikaru Suenaga Hikaru Suenaga Masanobu Shiga Masanobu Shiga Takashi Ikegami Takashi Ikegami Rapid and simple method for the determination of minimum biofilm eradication concentration (MBEC) using a colorimetric microbial viability assay based on reduction of a tetrazolium salt WST-8 and the biofilm formation method on 96-pegs on the lid of a microtiter plate was developed. The biofilms formed on the 96 pegs were challenged by antibiotics, and the MBEC was then determined from the microbial viability of the biofilms formed on the 96 pegs, assessed by the WST-8 colorimetric assay. The MBECs obtained by the proposed and conventional methods favorably agreed. The most effective inhibitors of S. aureus and P. aeruginosa biofilms were vancomycin and ciprofloxacin, respectively. In addition, we clarified that Staphylococcus aureus biofilm was maximally suppressed by a combination of vancomycin, daptomycin, and teicoplanin. The proposed method yields similar performance to conventional methods, but is faster and more easily implemented. Therefore, the proposed method alleviates the tediousness and time-consuming nature of conventional biofilm susceptibility assay.
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