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Porovnání kvality UHT mléka
Neubauerová, Markéta
The diploma thesis is concerned with the quality of UHT milk in the Czech republic and changing its properties during cold storage. The first part describes the composition of milk and the various steps of the manufacturing process of milk treated by high temperature heating. It is further elaborated the issue of nutritional and sensory changes after heat treatment. The second part focuses on the research of 35 samples of milk with different fat content UHT-treated by heating purchased in the Czech markets. We bought two packs from each sample. The content of some ingredients (fat, protein) listed on the packaging were experimentally controlled for all samples. A titratable acidity and active acidity was measured and the milk was analysed for sensory and microbiological quality. The samples were stored in the refrigerator. After the shelf life the sensory and microbiological quality was tested. The titratable and active acidity was checked again. The results were statistically analyzed by paired t-test and compared with results of other authors. It showed good quality UHT milk placed on the Czech market.
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Ovlivnění obsahu akrylamidu v medovém pečivu úpravou technologického postupu
Hadravová, Kristýna
The thesis process the issue of formation and elimination of acrylamide in foods. Experimentally solves optimization recipe to reduce the content of acrylamide in gingerbread while maintaining the sensory properties. It was verified the effect of three different additives (soda, calcium chloride and citric acid) on acrylamide formation in comparison with the original recipe, which is traditionally used leavening agent ammonium carbonate, which promotes the formation of acrylamide. Combination of all three tested compounds is able to reduce the acrylamide content below the detection limit and simultaneously achieve an acceptable sensory properties. Questions related to some undesirable effects in the rejected variants in tested combinations of additives are discussed.
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Možnosti výroby piva technikami vysokokoncentrovaných mladin v prostředí malých pivovarů
Stuchlík, Tomáš
In the theoretical part of the bachelor thesis on the topic Options for beer manufacture with methods of high gravity worts at the setting of small breweries are basic division of breweries by the size, description of traditional manufacture of beer and the HGB methods with adventages and disadvenages including practical experiencies of several brewers. For the taste panel evaluation were prepared eight samples with diluting of two original beer which were brewed at the practical tutorial of Brewing Industry. Evaluation was done with form for beer point evaluation. The best results reached undiluted beer, but between diluted samples wasn't striking diffference. Key words: HGB, minibrewery, adventages, disadvanteges, beer, high gravity wort, sensory evaluation
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Kvalita pšeničné mouky českých a zahraničních výrobců
Zigmundová, Veronika
The aim of this thesis was to compare the wheat flour quality of Czech and foreign producers. Soft wheat flour was evaluated from 14 producers from the Czech Republic and 21 foreign producers (from Austria, Slovakia, Romania, Ukraine, Australia and New Zealand). The basic technological analysis of these flour samples was made and farinograph properties of doughs were carried out on farinograph device. The baking experiment with the quality parameters evaluation and sensory analysis of baked products were made, the flour and crust colour was determined and the baked products compactness was carried out as well. The Czech flour quality didn´t differ from foreign flour significantly (level of importance = 0,05). Only Zeleny sedimentation test and drop dough consistency were different, where the Czech flour was evaluated better.
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Hodnocení bezlepkových potravin se zaměřením na bezlepkové těstoviny
DARDOVÁ, Magdaléna
This diploma thesis looks into the subject of gluten free pasta. They were evaluatded in boling test and from the point of taste. There were four groups of pasta selected, who are based on maize starch and it also contained many other igredients. The boiling test was conducted directly by the metodics and contents the boiling evaluation signs, binding, swelling capacity and sediments. Recommended time of boiling were extended only in group of pasta with maize starch basis whose binding was 118,5 %, swelling capacity 2,53 and sediments value 200 ml. Maize pasta with the contents of unctuous acids mono a diglycerids has binding 99,5 %, swelling capacity 2,36 and sediments value 50 ml. The biggest swelling capacity has the maize pasta with rice flour with its swelling capacity 2,18 a sediments value 110 ml. Selected pasta has also been evaluated from a point of atractivity for the consument and sensoric methods has been used. The group of 40 students of South Bohemian University has been collected atd followed was evaluated shape, swelling capacity, color, aroma and taste. The biggest loose of shape and biggest bidding was in group of maize starch pasta and the less. Color atractivity was in group of maize starch pasta and rice flour pasta. There was no major differences between tested groups from point of aroma. Also the taste of the samples was not been evaluated so high. The worst wal again group of maize starch pasta and rice flour pasta. Finally the overview of the samples has been evaluated by the best color, aroma, taste and overal. In every aspect the best samples was the maize pasta contains mono and diglycerids acids.
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Vliv surovin a technologie na senzorickou jakost čokolády
ŠINÁKLOVÁ, Petra
The theoretical part of the diploma thesis titled "The Effect of Raw Materials and Technology on the Sensory Quality of Chocolate" describes the commodity and the related legislation, the raw materials used for the production of chocolate, the substitutes for some basic raw materials, and the production procedures. The theoretical part also describes the significance of chocolate for human nutrition and analyses the defects that may occur in chocolate. The objective of the practical part is to ascertain the opinions of a selected group of consumers on the selected sorts of chocolates. The results are divided into two parts. In the first part I carried out a collective evaluation (men and women together), and in the second part I evaluated the results separately for each gender (men separately from women) in order to find out any differences in the sensory evaluation of this commodity between the groups. The evaluators' preferences between three sorts of dark chocolates of the same brand with a different cocoa quantity were tested and evaluated by means of a ranking test. The preferences between two sorts of dark chocolates with orange flavour produced by two different producers were evaluated by means of a pair test. I also carried out and evaluated a questionnaire survey aimed at ascertaining the liking for various sorts of chocolates with different composition.
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Effect of used sweeteners on sensory properties of fruit jams
PIHLÍK, Pavel
This thesis deals with the sorting and use of sweeteners in the production of fruit spreads. The theoretical part focuses on the sorting of sweetening agents and their classification. Furthermore, it presents procedures of production of fruit spreads and their assortment. The main goal is to compare sensory attributes of jams that I produced according to an assigned recipe, which is described in the practical part of this thesis. These jams were made from regional fruits (strawberries, apricots, sour-cherries) and sweetened with both natural (sucrose, sorbitol, Steviol glycosides) and artificial (sucralose) sweetening agents. The control group of this research were the students and employees of the University of South Bohemia in České Budějovice in the age of 24-60 years. The evaluators filled in a sequence test protocol and a questionnaire for consumers. The results of the sensory analysis were processed into tables and graphs with the aid of statistical methods.
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Use of meal from Jerusalem artichoke tubers in production of products from minced meat
MUŽÍKOVÁ, Monika
Jerusalem artichoke is a root vegetable containing glucofructan inulin in its tubers that is valued for its positive effect on the human organism. The aim of thesis was to evaluate use of meal made from Jerusalem artichoke tubers in production of products from minced meat. The experiment was divided into two parts. In the first part, the differences in water-holding capacity of semi-rough wheat flour and Jerusalem artichoke powder (JAP) in various types of solvents were determined. The statistically significant difference in water-holding capacity between the flours was found solely in the saline solution. Furthermore, the results showed that type of solvent had the main effect on water-holding capacity. In the second part of the experiment, 4 types of meat products were made - sausages, meatloaf, liver pate and meat hash. Wheat flour, which is commonly added to these products, has been completely replaced by (JAP). Subsequently, the sensory analysis was evaluated by experts (n = 16) for an estimation sensory quality and sensory changes of new product with JAP compared to standard meat products. The results of the study showed that the addition JAP to sausages had a negative effect on its sensory quality, namely its overall appearance of the product, texture and taste. On the contrary, there were improved functional properties in meatloaf (juiciness) and pate (taste). According to the results of the sequence test, the liver pate was found the most delicious product.
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