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The addition of carbon dioxide to milk for cheese production
Králová, Petra ; Hrstka, Miroslav (referee) ; Kvasnička, Miloš (advisor)
This work deals with the addition of carbon dioxide to milk for cheese production. The first aim was to elaborate a literary search focused on chemical composition of milk and its changes after addition of carbon dioxide and to describe production processes, with or without addition of carbon dioxide. The opening part was in particular focused on production of cheese with carbon dioxide and what all this gas causes during production. Carbon dioxide significantly decreases pH, thereby preventing from multiplication of undesirable microorganisms, it is also very important for shortening of production time, because it shortens the coagulation time. The main aim of experimental part was to determine the optimum addition of carbon dioxide to milk for production of Balkan cheese and using several analytical methods to compare cheese produced with and without addition of carbon dioxide. The sensory methods suitable for following of sensory differences of produced cheeses were also chosen and applied. By request of Dairy in Polná Ltd., the operation economy was calculated, which revealed that production with carbon dioxide is very useful and can reduce production costs of Balkan cheese, which would certainly be positive. The advantages and disadvantages of cheese production with carbon dioxide for consumers as well as for producer are evaluated as conclusion of this work.
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Influence of selected active compounds for properties of gel and emulsion cosmetics
Gardoňová, Lenka ; Pekař, Miloslav (referee) ; Zemanová, Jana (advisor)
This master‘s thesis studies problems of chosen active substances in cosmetic emulsions and gels. There is their main characteristics – distribution and properties of cosmetic emulsions and gels, preparation of the active substances, effects on the skin and conditions, which could them influence. In experimental part, preparation of gels and emulsions bases was described which were than enriched by active substances - evening primrose oil, hemp oil, Salvia officinalis extract, Symphytum officinale extract and sea salt. Properties of these cosmetic gels and emulsions bases with the addition of active substances depend on temperature and method of storage, amount of light exposure, method of preparation and another conditions. Action of these factors can cause changes of the stability, thereby the cosmetics effects on the skin can be lost. On the bases of performed rheology measurements (oscillation and flow measurements), pH measurements and sensory analysis were determined, if the properties of examined samples were changed. The measurement was performed in the certain time intervals and the properties were evaluated like at laboratory temperature 23±2 °C, so after exposure to temperature regime 37 °C in thermoregulator. On the basis of performed measurements, there was determined, that gel base with addition of Symphytum officinale extract had the most stability properties.
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Selected Qualitatives Parameters of Monofloral Honey from The Czech Republic
JURÁKOVÁ, Andrea
The theme of this thesis is a comparison of selected quality indicators of samples from single-flower honeys from the area of the Czech Republic and honeys from different retail chains. The theoretical part focuses on the characteristics of the individual kinds of honey and how different their composition is. There are described basic physical and chemical requirements for honey including sensory requirements which are specified in Regulation No.76/2003 Code. The practical part contains a physically-chemical analysis according to the Harmonized methods of European Honey and a sensory evaluation of selected single-flower honeys (honeydew, acacia, lime, sunflower and rape). There were analysed twenty samples of honey from Czech beekeepers and fifteen samples of honey bought in different retail chains in the Czech Republic. Subsequently, these parameters were monitored - water content and acidity. Next step was a test for evidence of disruption by starchy sugar and malt extracts. Then, sensory requirements such as colour, smell, taste and consistence were evaluated. The conclusion of the comparison of honey samples indicates that individual honey samples differed the most in the taste and smell criteria and in addition the samples were often disrupted by starchy sugar and malt extracts. The samples collected from the beekeepers from the area of the Czech Republic complied with Regulation No.76/2003 Code. On the contrary, the samples from the chosen retail chains in the Czech Republic weren't in accordance with the criteria specified in Regulation No.76/2003 Code.
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Impact of alternative feed on growth, yield and sensory evaluation of flesh of salmonids.
PFLUG, Róbert
The bachelor thesis evaluates the impact of alternative feed on growth, yield and sensory evaluation of flesh of salmonids. The technology "finishing feeding" and its impact on these indicators was evaluated by a feeding test conducted in trout farm in Annin (Klatovské rybářství a.s.). The experimental species was brook trout (Salvelinus fontinalis L.) with average weight of 156 ? 4,91 g. The test was carried out for 135 days and there were 2 diets. Diet A (rapeseed oil, RO) or B (fish oil, FO) or their combination (45RO:90FO; 90RO:45FO). Each treatment was carried out in duplicate. After 45, 90 days and at the end of the test, evaluation of production characteristics, yield and sensory evulation of fish muscle was carried out. Fish oil replacement by rapeseed oil had no effects on fish survival, growth, feed conversion and yield. After 45 days (first sensory evoluation), flesh of fish fed diet with rapeseed oil was better senzory evaluated than fish fed fish oil diet. However, the later sensory evaluation didn?t show any statistical differences among the treatments.
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Sensory evaluation of selected types of mould-surface ripened cheese
BLECHOVÁ, Radka
Sensory quality is one of the most important factors affecting food consumption. Mould-surface ripened cheeses are a favourite group of cheeses. Time of their ripening could affect the choice and also the consumption. A preference test (ranking) was carried out in a group of 54 consumers (students, 20 ? 24 years). Their aim was to order four samples of surface-ripened cheeses (Hermelín) from two producers with different time of ripening. Both women (20) and men (34) preferred the samples with short time of ripening in comparison to longer-ripened cheeses. However, the results were not statistically significant.
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Sensory evaluation of selected types of semi-hard cheese
KOUBOVÁ, Klára
In the group of 55 consumers (20 women, 35 men; 20 ? 24 years) was carried out preference test (ranking). The aim of preference test was to order three samples of cheese of different fat on dry basis (20, 30 and 45 %). In the group of women was preferred the sample of cheese with 45 % fatness and the worst was rated a sample with 20 % fatness. In the group of men was rated as the best 20% cheese and the worst sample with 30% fat. Statistically, these results were not confirmed.
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Sensory evaluation of selected milk products
HALÁMKOVÁ, Eliška
The aim of this thesis was carried out using one of the methods of analysis of sensory evaluation of selected dairy products. Based on the proposed questionnaire survey carried out simultaneously on consumption and preference for selected commodities. The thesis was part of the project ECOP CZ.1.07/2.3.00/09.0081: "Comprehensive training of human resources in the dairy."
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Sensory evaluation of a selected type of a meat product produced by various producers.
VLČEK, Jiří
The diploma thesis describes the issue of sensory evaluation of food and food products, in particular the sensory evaluation of a selected type of a meat product produced by various producers. Due to its great popularity with Czech consumers, ?Vysočina? salami was selected for the sensory evaluation. Six producers were randomly selected to undergo the testing. The evaluation was conducted in the laboratories of the Faculty of Agriculture of the University of South Bohemia. The testing was performed by 58 evaluators being the students and employees of the Faculty of Agriculture of the University of South Bohemia. For the purposes of the sensory evaluation, the method of a rank test was used for which each evaluator obtained one sample of the salami of each producer and was to rank the samples based on their quality from the best to the worst. Based on the sum of ranks, the following rank was determined: Vysočina Hodice, MP Krásno, Maso Planá, Kostelecké uzeniny, KMOTR ? Masna Kroměříž and Masna Příbram. In order to ascertain the demonstrativeness of differences among the evaluated samples, the Friedman?s method was used. The resultant value has shown that there are demostrative differences among the evaluated samples at the probability level of 99 %.
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