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Influence of coffee making process on chemical composition of brewed coffee
Trenzová, Kristina ; Divišová, Radka (referee) ; Diviš, Pavel (advisor)
This bachelor thesis deals with the influence of baristic coffee preparations on the chemical composition of the obtained beverage. Teoretical part of this thesis focuses on coffee growing, processing technology and the chemical composition of coffee beans. In the experimental part were measured samples of espresso coffee, samples prepared by moca pot, flip-drip method, filtrated coffee, samples prepared by french-press technique, vacuum pot samples and boiled coffee. The samples were prepared according to the baristic techniques at first and later with adjusted water and amount of coffee so these methods could be compared with each other. This work focuses on the determination of caffeine and acrylamide content by liquid chromatography, validation of HPLC method, determination of total phenolic content by Folin-Ciocalteu reagent, determination of organic acids by ion chromatography, determination of selected macro and micro elements by inductively coupled plasma in optical emission spectrometry and analysis of aromatic substances using gas chromatography. Based on the processed results and compared methods, it was shown that the moca pot had the greatest influence on the content of caffeine, acrylamide, organic acids and total phenolic substances, and the flip-drip with vacuum pot method had the greatest influence on the content of aromatic substances. From a baristic point of view the highest concentration of caffeine was 3689 mg/l in coffee based on flip-drip method, and concentration of acrylamide was 25,4 mg/l in the coffee based on the same method. The highest value of total phenolic content was determined in moka pot to c = 5,23 g/l. Regarding the mineral representation, the mineral decomposition of coffee beans and espresso were compared, and the highest values were reached by potassium, namely the concentration was 577 mg/l per 1 g of mineralized sample, in the cup of espresso the potassium concentration was 2461 mg/l. The highest content of organic acids was determined in the beverage prepared by moca pot, in terms of selected acids, the largest representation had the succinic acid with the concentration 599,8 mg/l. The highest content of aromatic substances was found in coffee from a moca pot and in coffee by flip-drip method. The biggest part was~made by furfuryl alcohol.
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Interakce mezi minerálnimi prvky v dietě brojlerů a jeji vliv na vlastnosti svaloviny
Prokop, Jakub
Diploma thesis deals with influence of mineral elements level in the diet of broiler chickens. Primary observe their importance in meat production with high nutritional and sensory quality. In experiment we tried to modulate the performance of chickens by changing the level of zinc (24 g, 204 g), calcium (2 g, 15 g) and magnesium (1,5 g, 4,5 g) and test the influence on sensory attributes of breast and tight meat. After slaughter in the age of 36 days the meat was processed and frozen stored. In sensory analysis (after heat processing) color, texture, odour, presence of strange odour, tenderness, juiciness, taste and presence of strange taste was judge. We discovered that different level of zinc has negative influence on the odour of tight meat (85,50+-2,108; 77,03+-3,333). Higher level of calcium and magnesium for the breast meat had positive influence on the color (83,53+-2,663; 88,50+-1,731) and negative influence on odour (86,10+-2,428; 76,66+-3,341), chewiness (77,73+-4,157; 63,33+-4,607) and taste (71,83+-4,325; 57,75+-4,532). In the end we can conclude that addition of different levels on mineral elements can influence organoleptic properties of meat and its acceptance for the consumer. It is necessary to do more experiments in this subject in the future.
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Kritické zhodnocení pojmu "superpotravina"
Peňáková, Jana
The bachelor thesis deals with the term "superfood" and aims at its critical evaluation. It defines this term and clarifies treatment by legislation. It specifies the physiological effects of selected superfoods, such as dietary fiber, healthy fats, vitamins, minerals, antioxidants and proteins. The work focuses on selected types of domestic superfoods, their composition and beneficial effects on health.
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Vliv arbuskulárních mykorhizních hub na fyziologické projevy a plodnost u révy vinné (Vitis vinifera L.) =: The effect of arbuscular mycorrhizal fungi on physiological processes and fertility of grapevine (Vitis vinifera L.) /
Sedláček, Martin
In a three-year field experiment we evaluated the effect of arbuscular mycorrhizal fungi (AMF) on physiological processes and fertility of grapevine (Vitis vinifera L.), there were two variants: inoculated with AMF compared to uninoculated control. The experiment took place at the Faculty of Horticulture, Mendel University in Brno, using Pinot noir and Lemberger planted as a field experiment and in containers (seedlings) and the second part took place in already established vineyard (mature plants). The positive effect of AMF on the must gained from mature plants of both varieties was observed at following parameters: sugar content, assimilable N, Mg and Fe. All the seedlings from both container and field experiment and both varieties demonstrated a positive effect of AMF on the intensity of photosynthesis, stomatal conductance and transpiration level. The expected positive impact of AMF on all investigated parameters was not significatntly demonstrated, which corresponds with the results of current research on this topic.
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Studium a ověřování sortimentu netradičních zelenin v podmínkách ČR
Skaličková, Zuzana
This study focused on 20 kinds of vegetables that Czech consumers do not only widely-consumed. Described herein is their appearance, origin and history, claims, cultivation pos-sibly proliferation, diseases and pests attacking the crop and treat plants against them, ways and time of harvesting and finally table nutritional values focusing on fiber, vitamin C, potas-sium, sodium calcium and magnesium, as well as in the field trial, which was carried out ac-cording to the assignment at 5 selected crops for which we measured morphological and lan-dlord-tion properties focusing on their height, width and weight before adjustment and af-ter-cleansing of the plants. For Brassica rapa (L.) var. nipposinica H. Bailey, Brassica rapa (L.) subsp. chinensis, Brassica rapa (L.) subsp. pekinensis, Raphanus sativus (L.) var. longipinnatus and Rocket Selvatica (L.) Mill is provided: vitamin C, dietary fiber, dry matter, antioxidants, phenols, flavonoids, carotenoids and minerals. All selected species will adapt to the conditi-ons of the ČR and have successfully propagated. These species can be described as promising and suitable for introduction into the country. It was also performed to evaluate of sensory-three vegetables in raw or processed form. The results were statistically evaluated and commented. It was found that the most nutritious crop is rukola. Also leaves white radish, sown provesly high nutritional value. Chinese and pekings cabbage reflected as average in terms of nutritio-nal value, but the flavor in the sensory evaluation of the respondents did well. Preferably, however, the respondents were turnips, thanks to its delicate taste and water levels.
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Vliv podnože na příjem minerálních látek
Šimoníková, Lenka
This work has been written on the topic Effect of rootstocks on the intake of minerals. In this work I was concerned with using the rootstock used in vineyards in the Czech Republic. What are the positives and negatives their utilization. The history of rootstocks have the use as a weapon against the aphid grape phylloxera. Description of individual rootstocks and botanical species from which they are crossed as well. Evaluation of soil conditions that are the most suitable for the rootstock. Furthermore, what impact does it on the income base minerals for the whole bush and the berries. Characterization of the individual elements of mineral nutrition for optimal growth of shrubs. And last but not least the application of rootstocks in practice.
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Non-specialists' awareness of alternative nutritional movements and their risks
Šafářová, Jana ; Chrpová, Diana (advisor) ; Pejšová, Hana (referee)
Nowadays alternative nutritional directions with all their forms are quite widespread. For many people, vegetarianism is not only skipping meat consumption, but also lifestyle. However, deliberate omission of certain types of food carries the risk of a deficit of some important substances. The aim of this thesis was to map awareness of lay people about vegetarianism and veganism. Find out if respondents know what excludes vegan diets, how they differ from vegetarianism and what the risks are. The theoretical part deals with vegetarianism and its division. The thesis focuses mostly on veganism. The theoretical part also contains principles of properly composed vegan diet according to the Czech vegan society. It also contains a description of substances which may be defficient in the vegetarian and vegan diet. It shows the functions of these substances in the body, in what foods they are found and how their deficiency manifests. The practical part was carried out by the quantitative method of the questionnaire survey. The research sample consisted of the lay population most frequently at the age of 20- 29 years. A total of 146 respondents completed the questionnaire. The results of the questionnaires showed that 88% of respondents were able to correctly describe what excludes vegan diet. This...
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Concentration of selected metals in traditional and herbal teas
Brlíková, Eliška ; Křikala, Jakub (referee) ; Diviš, Pavel (advisor)
This thesis deals with determination of selected metals concentrations in loose green, black and herbal teas purchased in the Czech Republic and beyond. All samples were analyzed by ICP-OES. Most metals were not detected in the extracts. The final metal concentrations that have been detected in the tea extracts meet the legislative limits and do not bring a health risk to humans. The statistical processing of the measured results, based on different concentrations of selected elements, managed to distinguish the extracts from black and green teas.
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Evaluation of content levels of selected micro- and macro-elements in grain of fodder wheat cultivars produced within company RABBIT Trhový Štěpánov, a.s.
NERAD, František
The aim of the diploma thesis is to evaluate the content parameters of a selected group of macro and micro-elements in wheat seed (Triticum aestivum) within a group of varieties (Elixer, Vanessa, Tobak, Bombus) for feed use. Grain samples obtained in an experiment conducted within the company Rabbit Trhový Štěpánov a.s. on three different sites. In addition to the analysis of the selected group of grain qualitative parameters, the yield parameters (number of plants and cobs per area and harvested grain volume per unit area) were also evaluated. The introductory part of the thesis focuses on general information on wheat, its importance and its use. Another part of the literary research focuses on the chemical composition of the grain, the quality of the wheat and the factors affecting the quality of the wheat. The most important and most extensive part of literary research focuses on general information on minerals and their importance in animal nutrition. The methodology of the work includes the presentation of Holding Rabbit Trhový Štěpánov a.s., characteristics of the varieties and habitats on which the experiment was carried out. Furthermore, of course, it contains the soil and climatic characteristics of the sites and methods used to obtain the assessed data. The final part of the work is devoted to the results, the discussion and the conclusion in which the achieved results are evaluated and compared. It should be added that the data were obtained in the framework of the experiment in close cooperation with Rabbit Trhový Štěpánov a.s. and the level of selected elements in the grain was determined in a certified laboratory according to standardized methodologies and standard operating procedures.
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Vegetarianism and pregnancy
Šimončičová, Renáta ; Krejčí, Hana (advisor) ; Pejšová, Hana (referee)
Introduction: Master's thesis is focused on the problems facing vegetarianism during pregnancy. Further study is focused particularly on the exploration of pregnant vegetarian's dietary habits. Object: The theoretical part's target is to familiarise readers with vegetarianism and pregnant vegetarian's diet. The practical part is focused on pregnant vegetarian's dietary habits, finding if those women are drawn to alternatives relating to decisions regarding their own bodies and if they will follow a vegetarian diet with their children. Methods: The survey was conducted through an anonymous online questionnaire. The data obtained is represented in graphs and tables. One part of the work is devoted to the analysis of the data. Results: The theoretical part shows that compilation of a properly assembled vegetarian diet during pregnancy requires enough relevant information. The survey shows that the majority of respondents eat mostly varied food according to the principles of healthy nutrition with respect to vegetarianism. The greater part of the respondents tend to alternatives in relation to decisions about their own bodies. Absolute majority of respondents stated they are not going to lead or are not leading their children to vegetarianism. Conclusion: Proper preparation of meatless diet requires...
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