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Characterization of antioxidative and antimicrobially active substances in some types of wood
Ďatko, Tomáš ; Hlaváček, Viliam (referee) ; Márová, Ivana (advisor)
The purpose of this bachelor thesis is to analyze antioxidant and antimicrobial active substances in woody plants. The theoretical part deals with characterization of these biologically active substances, the overview of selected types of woody plants and dividing of extraction techniques. Moreover, methods for determination antimicrobial activity were described. The experimental part is focused on preparation of bark extracts of birch, oak and willow using different solvents (water, methanol, ethanol, DMSO) at various parameters (time, temperature). The concentration of polyphenols, flavonoids, tannins and antioxidant activity was set by using spectrophotometrical method. Subsequently antimicrobial activity of extracts was tested against the three microorganisms: Micrococcus luteus, Serratia marcescens and Candida glabrata. The results show that the most antioxidant active substances are found in the willow bark and antimicrobial activity was showed very weakly in selected bark extracts.
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Characterization of antioxidative and antimicrobially active substances in some types of wood
Ďatko, Tomáš ; Hlaváček, Viliam (referee) ; Márová, Ivana (advisor)
The purpose of this bachelor thesis is to analyze antioxidant and antimicrobial active substances in woody plants. The theoretical part deals with characterization of these biologically active substances, the overview of selected types of woody plants and dividing of extraction techniques. Moreover, methods for determination antimicrobial activity were described. The experimental part is focused on preparation of bark extracts of birch, oak and willow using different solvents (water, methanol, ethanol, DMSO) at various parameters (time, temperature). The concentration of polyphenols, flavonoids, tannins and antioxidant activity was set by using spectrophotometrical method. Subsequently antimicrobial activity of extracts was tested against the three microorganisms: Micrococcus luteus, Serratia marcescens and Candida glabrata. The results show that the most antioxidant active substances are found in the willow bark and antimicrobial activity was showed very weakly in selected bark extracts.
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