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Impact of honey processing on its antimicrobial activity on bacteria Escherichia coli
ŠTEFANOVÁ, Kateřina
In the theoretical part of my bachelor thesis, I discuss honey, its chemical composition, physical properties and use in medicine, where I mainly describe the antimicrobial activity. Next, I briefly describe the characteristics and pathogenic strains of bacteria Escherichia coli. The aim of the work was to test the handling and processing of honey for its antimicrobial activity. Two indicators of antimicrobial activity were determined, namely the Minimum Inhibitory Concentration (MIC) and the Minimum Bactericidal Concentration (MBC) against gram-negative bacteria E. coli. These parameters were tested on 6 samples of extracted honey and then after drying for 12 hours, heating in a water bath at 50 °C until liquefaction (approximately 1 hour) and after heating in a microwave oven at 250 W until liquefaction. The Broth microdilution assay method with spectrophotometric evaluation was used to determine the MIC. MBC was determined by streaking and culturing the bacterium on an agar medium. In addition, the water content and electrical conductivity of the dialed and dried honey samples were determined. The results showed that all of the mentioned processing methods negatively affected the antimicrobial activity, with the worst results being after microwave treatment. Since honey is routinely heat treated in practice, these results can help to choose the most gentle treatment method.
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