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Monitoring of changes of chemical parameters in wine production
Dlapalová, Kristýna ; Vespalcová, Milena (referee) ; Vránová, Dana (advisor)
This bachelor work deals with chemical ganges of the wine must during the fermentation process. We compered the sample must with addend commercial yeasts and indigenous yeasts. The theoretical part describes the vine and its variety. The variety Saugvinon is central of this work and it is more described.. The theoretical part describes the structure of grape and its chemical technology of wine production and wine disease. The production technology is divided into different steps of the production (eg. picking the grapes, pressing, fermentation and wine training). The experimental part describes the methods used in the determination of chemical parameters including the chemicals and equipment. The results are summarized the results of the determination of reducing sugars, titratable acidity, alcohol and pH must. The results are evaluated and commented upon in the discussion.
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Brewing industry
Artýszková, Jana ; Illková, Kateřina (referee) ; Omelková, Jiřina (advisor)
The aim of the theoretical part of the thesis is the study and the treatment of the problem of the manufacturing of beer, focused on the czech conditions and classical Czech technology. Within the theoretical part the history of this branch of industry together with the modern methods, enabling greater productivity of beer production, are summarized. Experimental part of the thesis was carried out in a small brewery in Czech republic, producing aproximately 10 000 hl per year. In this brewery the selected parameters were studied not only in the course of cooking and fermentation of beer, but during the output control in racking to the drums and plastic bottles, as well. The studied parameters were as follows: the sugar content of front and wort, the control of microbiological contamination in fermenting cellar and in beer-storage cellar, the content of CO2 by last stage of fermentation and pH- value and color by the end-product.
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Grape must and its changes during the fermentation process
Beníčková, Romana ; Vespalcová, Milena (referee) ; Vránová, Dana (advisor)
This bachelor thesis deals with chemical changes of grape must during fermentation process. The theoretical part describes history of viticulture, characteristics of vine and varieties analyzed in this work. There are discussed the morphological and chemical composition of grapes in the theoretical part and also basic technological steps of wine production. Another chapter is devoted to the principles of methods for chemical analysis of wine. In the experimental part, monitoring results of changes in chemical parameters of musts during fermentation are discussed. The measured parameters in this work were reducing sugars, pH, titratable acid and ethanol. The analyzed musts were obtained from Sauvignon and Pinot Noir varieties, which originated from integrated and organic vineyards.
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The effect of pesticides on the grapevine microflora
Damborský, Pavel ; Pořízka, Jaromír (referee) ; Omelková, Jiřina (advisor)
The bachelor thesis of theoretical character contains information about an effect of pesticides on grapevine microflora. At the beginning there is a description of general pesticides characteristic, their classification, toxicity and a brief overview. Further it describes illnesses and pests that often attack grapevine. The next chapter deals with grapevine microflora. It defines morphology, taxonomy and reproduction of microorganisms most often occur on grapevine and during technological processing of wine. The last chapter is focused on effect of pesticides on microorganisms during alcoholic and malolactic fermentation.
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Monitoring of changes of grape juice chemical parameters during the process of fermentation
Bídová, Veronika ; Vespalcová, Milena (referee) ; Vránová, Dana (advisor)
This bachelor work deals with chemical changes of the wine must during the fermentation process. In the introductory theoretical part is mentioned the history of wine and characteristic of wine. Further work is devoted to the chemical composition of must and wine producing technology. It describes the grape harvest, pressing, adjustment of the must with chemicals, fermentation and wine training. The theoretical part describes the basic analytical techniques for monitoring the qualitative parameters of wine. In the experimental section are summarized the results of the titratable acids, total polyphenols and the pH of the must from integrated and organic vineyards. The results are evaluated critically.
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Characterization of intermediates and waste products of some fermentation productions
Kilian, David ; Skoumalová, Petra (referee) ; Márová, Ivana (advisor)
This bachcelor thesis was aimed on characterisation of intermediate and waste products of some fermentation productions. The theoretical part of this thesis is aiming on characterization of raw material and its fermentation, process of distillation, waste product and introduction of main active components of all these intermediates. In the experimental part were characterized intermediates and products regarding the contents of sugar, ethanol and polyphenol. All these extracts contain particular levels of polyphenol and sugar corresponding to individual phases of fruit distillates production. The chemical characteristics of extracts from different phases of fruit distillates production were compared. Parameters as total phenolics, flavonoids, glucose, fructose and ethanol were evaluated. Subsequently the changes between individual phases were described. In conclusion, a solution of further use of waste products formed during fruit fermentation process was suggested.
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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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Different parameters monitoring by lager beer types
KLIMEŠOVÁ, Petra
This bachelor thesis focuses on beer and its production and emphasizes the possible ways of final technological treatments, especially filtration and pasteurization. The thesis is divided into two main parts - an introductory literature search, introducing the whole issue, and a methodology or a practical part. In the second part, the process of production of 11% Pilsner beer and its further procedures are described more in detail. The methodology includes the evaluation of data obtained during a ten-week observation of four different samples of bottom-fermented beers, all the Pilsner type. The data were obtained in two ways, specifically by analytical measurement using a beer analysis device - FermentoFlash - and by sensory analysis.
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Changes of selected indicators during the aging of beer
NOVÁK, Jan
The diploma thesis deals with the monitoring of selected quality parameters of chemical analysis during the beer maturation. The course of the change in alcohol content, the actual and apparent extract in the beer, the extract of the original wort and the degree of fermentation of the beer were monitored. Results of the analysis of beers from the Mini-Brewery of the Faculty of Agriculture of the University of South Bohemia in České Budějovice and the brewery Litovel, a.s. are compared in a uniform technological time of production at the end of maturation just before bottling with samples of beers purchased in the market network in the Czech Republic.
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Basic analytical components changing during the final stages of beer production
HAVLÍČKOVÁ, Martina
The aim of this thesis is to observe the final phase of beer production in cylinder-conical fermentation and ripening tanks. The task is to observe and measure basic analytical parameters while finishing beer fermentation, that include: % alcohol (weight), % alcohol (vol.), % real extract, % apparent extract, % extract of the original wort, relative density, and osmotic pressure. The theoretical part of this thesis explains the concept of beer, further it clarifies legislative requirements on beer production, requirements on quality and ingredients. It further describes the chemical composition of beer, the fermentation of beer, as well as the principle of the functioning of cylindro-conical fermentation and ripening tanks. The practical part of the diploma thesis compares data gained through measurements of samples of 10° and 12° bottom fermented beer of Pilsner type, a half of samples being taken from cylindro-conical tanks, and the second half being taken from open tubs. Other chapters provide the processed results of inividual measurings, and the conclusion sums up all the facts that were found.
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