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Determination of volatile substances of natural extracts intended for cosmetic application
Paskevych, Olha ; Řezáčová, Veronika (referee) ; Mravcová, Ludmila (advisor)
Tato bakalářská práce je soustředěná na zkoumaní přírodních komerčně dostupných extraktů, které se používají do přírodní kosmetiky. Literární rešerše byla zaměřena na téma obsahu těkavých látek v přírodních extraktech používaných v kosmetice, jejich charakterizace a možnosti stanovení, problematika výskytu alergenů v přírodní kosmetice. Na základě tohoto přehledu byla navržena optimální metoda pro analýzu vzorků přírodních extraktů s přihlédnutím k dostupné analytické instrumentaci. Následující výtažky byly studovány se zaměřením na kvalitativní stanovení: mandle, aloe vera, hřebíček, Etiopská káva, zázvor, cibule.
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Basic features of wine fermented from freerun and pressed must
Becková, Eliška ; Šalplachta, Jan (referee) ; Vespalcová, Milena (advisor)
My work is engaging in winemaking of white and red wines. Theoretic processes and goings during winemaking is describe in the first part of this work. It deals harvest of kapes, fermetation, clearing wine, chemical content of grapes and wine, deseases and abnormality of wines. There are this described choosen variettes, their grapes were processed practically. The third part of this work is dealed in practice winemaking and chemical analyse sof wines. Musts from the start of pressing, from the first dressing and from the end dressing fermented to the end dressing . They were fermented and than analysed by chemical and tasting tests. The discussion about the dependence of the quality of wines on the kind of the must during pressing is presented in the end of this work. The results are motivated by chemical analyses and senzoric tasting of the experts.
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Producing big rage shell
Doležel, Martin ; Císařová, Michaela (referee) ; Lidmila, Zdeněk (advisor)
The bachelor's thesis presents a proposal for the technological process of production of a big rage shell, the semi-finished product of which is a circular roundel made of non-alloy steel DD11. Based on the study part and the subsequent technological part, drawing without wall thinning and with wall thinning is proposed. The drawing is carried out on a hydraulic progressive six operating press PO 400 P with a forming force of 4,000 kN. Cutting of blanks is performed on an eccentric press LE 400 D. One part of this thesis is the design of a tool for drawing without thinning the wall and a tool for the last operation of drawing with thinning the wall. These tools are made of 19,436 steel according to the drawing documentation.
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Filtering of Texts Extracted from PDF, OCR or Web
Lehnert, Filip ; Plchot, Oldřich (referee) ; Szőke, Igor (advisor)
The objective of this thesis is to implement a set of scripts to improve the transfer of various types of documents into fully text. There appears noise and not entirely correct character conversion by converting various file formats. These scripts extracted text file cleans so that the resulting text is readable, make sense and does not contain any residues of various characters appearing by the transfer of graphs, tables, formulas, etc. The script works universally and does not require input solely by OCR tools or converting from PDF or web.
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Study of Allelopathic Effects of Common Millet on Other Plants
NWAJEI, Lucky
Proso millet (Panicum miliaceum) is an important source of energy and protein for people and as well animals. At present, there are practically no data available on the allelopathic effect of proso millet. The aim of the work was to evaluate the alle-lopathic effects of common millet on selected crops and to suggest the possibility of using the acquired knowledge. Laboratory experiments included evaluation of the effect of extracts from plant parts of millet and millet seeds on seed germina-tion and growth of selected plant species, as well as evaluation of autotoxicity of millet extracts, evaluation of the effect of different densities of millet seeds on allelopathic activity and stability of millet allelochemicals. The most effective extract inhibiting the growth of selected plants was the extract from young millet plants. However, millet allelochemicals do not seem to be suitable for weed control due to their low stability.
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Bacterial cellulose based facial mask with antioxidant property
Borová, Šárka ; Hoová, Julie (referee) ; Kovalčík, Adriána (advisor)
This final thesis deals with the preparation of a cosmetic facial mask based on bacterial cellulose. The motivation of this work was to prepare a cosmetic mask with antioxidant properties. To obtain bioactive substances with antioxidant activity, extracts from the rosehip fruits (Rosa Canina L.) with different weight dosages of rosehips and different preservatives were prepared. These rosehip extracts were subjected to spectrophotometric methods, thanks to which the total contents of polyphenols, flavonoids and total antioxidant activity were determined. It was proven that the content of the determined substances increases with the proportion of weighted rose hips and the highest contents of antioxidant substances were measured in extracts with a weight of 25 g of rose hips. Subsequently, these selected extracts were modified into several samples of bacterial cellulose. After the modification of the substances, it was demonstrated that bacterial cellulose is a suitable material for absorbing bioactive substances into the structure of individual analyzed samples. It was found that bacterial celluloses in the form of hydrogel and lyophilized bacterial cellulose were able to absorb the largest amount, of bioactive substances with antioxidant properties. On the other hand, the samples of dry bacterial cellulose and bacterial cellulose with an alginate component absorbed active substances the least. Furthermore, analysis using a Visioscope device revealed that the facial cosmetic mask based on bacterial cellulose in the form of hydrogel could potentially have not only antioxidant but also hydrating effects on the skin.
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Sledování fermentability sladin u vybraných druhů sladů
Zárubová, Emílie
In my diploma thesis on the topic “Monitoring the fermentability of worts for selected types of malt” has been processed information on the fermentabilitity of worts, the degree of fermentation, extractive substances and the factors that affect them. Furthermore, the thesis processes themes, which deals with malt, its production, requirements for malt and especially types of malt. Information is included not only conventional barley malt, but also on some less common types of malt. The first half of the diploma thesis processed this information on a theoretical level. The second half of the diploma thesis is focused on experimental activites related to the production of malts, worts and subsequent fermentation of the worts. For the production of the worts were used barley, wheat, oat, rye, corn and millet malt. The amount of extractives before fermentation, after fermentation and the amount of alcohol were determined for individual worts. Based on the difference between the extract before fermentation and after fermentation, the fermentability of worts produced from individual types of malts was determined. The results obtained are compared with those already known and with those obtained with conventional barley malt. According to the results, wort made from wheat malt shows the best fermentability. Wort made from barley malt shows the second best fermentability. Furthermore follow rye wort, oat wort, wort made from millet malt and the wort from corn malt shows the worst fermentability.
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Colorant properties and stability of Reynoutria pigments
DVOŘÁK, Vojtěch
This bachelor thesis is focused on invasive species of the genus Reynoutria, specifically on obtaining color extracts from their rhoots and subsequent evaluation of their color properties under various environmental conditions in laboratory conditions. The color properties of extract L, a, b, Cab, h and Eab were evaluated using a colorimeter. The extracts were obtained with 96°C warm water, cold water and 100% ethanol from dried and fresh material. The dye content in rhizomes and stems of Reynoutria japonica and Reynoutria sachalinesis was evaluated based on the total The roots of Reynoutria japonica and Reynoutria sachalinesis can be used as a source of yellow to red-violet dye. For the preparation of the extract, dried roots can be recommended at an extraction ratio of 3 g per 1 liter of water and extraction at 95 ° C for 1 hour. The information obtained can potentially be used in the application of dyes in industry or, after verification of health safety, also in the food industry.
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Iron-chelating properties of fruit extracts of various elderberries
Gorová, Barbora ; Mladěnka, Přemysl (advisor) ; Kašparová, Marie (referee)
Charles University Faculty of Pharmacy in Hradec Králové Department of Pharmacology and Toxicology Candidate: Barbora Gorová Supervisor: Assoc Prof. Přemysl Mladěnka, Pharm.D., Ph.D. Title of thesis: Iron-chelating properties of fruit extracts of various elderberries Inorganic iron is the major food source of iron in humans. It plays role in many biochemical reactions. Thus, iron metabolism disorders can lead to different diseases associated with lack of iron or iron overload. One of the possible treatment modalities of the latter represents the administration of iron chelators. Elderberry, Sambucus nigra L. (Adoxaceae), has been used in traditional medicine. The fruits of elderberry are a rich source of cyanidin-based anthocyanins as the main component. There are important differences, both in chemical and physical properties between several cultivars of elderberry. Anthocyanins might interact with metals in the gastrointestinal tract by formation of chelates. However, data on metal interactions with anthocyanins are sparse. The main aim of this study was to perform the analysis of interaction of iron with elderberry fruit extracts as a rich and cheap source of anthocyanins with cyanidin as the aglycon. In this in vitro study ten elderberry fruit exctracts were tested for iron chelating activities...
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Literary-didactic potential of Capek's Apocryphs
Michálková, Lucie ; Klumparová, Štěpánka (advisor) ; Hník, Ondřej (referee)
The main aim of this thesis is to show the didactic potential of the Apocryphal Tales by Karel Capek as well as to suggest the possible ways to include it in the high school literature education. The theoretical part of this thesis mainly deals with the author - Karel Capek and the concept of the Apocryph. These theoretical chapters study the Apocryphal Tales in detail, especially, focusing on the origin of the book and the existing editions, content and formal analysis, author's work with the intertexture and artistic progress used by Karel Capek. The special part is dedicated to the possible reasons of underestimation of the Apocyrph within author's other works. The practical part targets the didactical potential of the Apocryph. There are described the possibilities of the work with all the texts and possible ways how to work with the idea of Apocryph. The crucial part shows the detailed analysis of the didactical potential of seven selected texts integrated with extended commentary to the structure of this chapter. Another very important part pursues the verification of didactical potential of one of the Apocryph in the framework of secondary school education. This part contains the commented version of the preparation for the high school lecture and its concluding reflection that comments on the...
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