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Porovnání účinnosti metod extrakce tropických dřev na základě analýzy získaného extraktu a jeho vlivu na dřevokazné houby
 Přibylová, Zdeňka
The thesis compares the efficiency of two extraction methods: using the FexIKA apparatus and using ultrasound. To compare the extraction methods, extracts from merbau (Intsia bijuga O.Ktze.) and jatoba (Hymenaea courbaril L.) were created. These tropical woods were ground and extracted. From the extracts, three concentrations of protective substances were created. The protective substances were tested to determine the content of extractive compounds and polyphenolic compounds. The obtained protective substances were impregnated into the wood of common beech (Fagus sylvatica L.) and pine (Pinus sylvestris L.). The impregnated beech and pine samples were tested to determine the protective effectiveness against Trametes versicolor L. and Coniophora puteana P. Karst. From the acquired data, the loss of mass of the wood was assessed. The results showed that only samples impregnated with the protective substance with concentration of 3 showed adequate protection. Analysis of the protective substances showed a higher yield when using FexIKA on Merbau wood. Jatoba wood extraction showed a slightly higher yield when extracting using ultrasound. In general, the samples impregnated with extracts obtained using FexIKA showed lower mass loss than samples impregnated with extracts obtained using ultrasound.
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Využití extraktivních látek tropických dřev pro zvýšení přirozené trvanlivosti buku
 Přibylová, Zdeňka
This Bachelor thesis focuses on evaluating antimycotic activity of extractive compounds acquired using the FexIKA extraction apparatus. Merbau (Intsia bijuga O.Ktze.) and jatoba (Hymenaea courbaril L.) were used as the sampled material. The extractive compounds were obtained from ground samples of the tropical woods. Then, the beech wood was impregnated with the compounds. A rapid durability test of vulnerability against Trametes versicolor L. was performed. From the data acquired, the weight loss of the impregnated samples and reference samples was evaluated. The results show that the extractive compounds procured from Merbau wood in the highest concentration were able to increase the natural durability of beech from class 5, i.e. not durable, to class 1 - very durable. Impregnation with extractives from Jatoba in the highest concentration level increased the durability from class 5 to class 2, i.e. durable.
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3 Přibylová, Zuzana
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