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Vliv účinných látek z rostlin na kvasinky kontaminující mléko a mléčné výrobky
 Javorský, Jan
The purpose of this graduation theses is to enlighten the mechanism which influences active substances from plants in specific yeasts types. Literature research focuses on yeasts and their importace in dairy as well as antimicrobial influence of active substances in plants. Three types of essential oils were selected for the purpose of experimental determination; essential oil from melissa, essentiaĺ oil from rosemary and essential oil from thyme. Antimicrobial effect of essential oils was tested on specific yeasts types, isolated from specific dairy products samples. The next step after yeasts identification was testing antimicrobial influence of essential oils using disk diffusion method and broth dilution method. The influence of essential oils was tested in two concentrations, 1 % and 10 %. The best result employing the disk diffusion method was achieved using 10 % concentration essential oil from melissa. Essential oil from rosemary resulted as worse option. The best effect employing the broth dilution method was measured when using the essential oil of rosemary, whereas the essential oil derived from thyme showed the least effect.
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