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Sensory evaluation of selected cheeses and analogue products
LAFATOVÁ, Veronika
This diploma thesis is focused on the evaluation of processed sliced products (cheese and analogues). For this purpose, was carried out sensory analysis of these products, a serial test and a questionnaire. Evaluation carried out a total of 65 assessors - 23 men and 42 women. The analysis of ranking showed that in the group of assessors was best evaluated processed wafer product (analogue) (average rank of 2,6) and processed sliced cheese (average rank of 2,7). For sensory analysis was found a significant role of fat on the dry basis of the product and the presence of added substances (extract from peppers, Emmental) on the perception of assessors. The survey was focused on the preference of the attractiveness of packaging of selected processed cheese slices and sliced processed products, furthermore focused on understanding the concept of the analogue product. Assessors have demonstrated their knowledge of the concept of analogue product only in 14% of cases.
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Evaluation of sensory quality of milk products by instrumental and sensory analysis
BLÁHOVÁ, Veronika
Sensory quality of dairy products is nowadays a very important product quality evaluation and is among the oldest. The analysis comprises the evaluation of color, aroma and flavor, texture. A comparison of sensory and instrumental analysis of milk products was made. Based on the obtained data it was evaluated that the sensory analysis is still an indispensable part and a device that could replace human sensory perception has not been developed yet.
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Processed cheeses and spreads and their sensory evaluation
BÍLKOVÁ, Kateřina
The bachelor thesis deals with the history of processed cheese and their classifications. Fat in dry matter is very important for the processed cheese and also its raw materials (natural cheese, melting salt, milk proteins, dyes, etc.). Cheese can be classified according to the method of production, composition, consistency and packaging. The thesis describes the consumption of processed cheese in certain years in these units and methods of sensory evaluation, involving sensory perception.
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The Technology of Processing and Sensory Quality Rating of Cow?s Milk and Chosen Products Made of It
BROŽOVÁ, Soňa
The bachelor thesis deals with the technology of processing and sensory quality rating of cow?s milk and chosen products made of it. I have set two aims and from them arising research questions. The first aim was to describe the technological procedures of the cow?s milk processing and to describe partial steps in the production of chosen dairy products. The second aim was to evaluate sensory properties of dairy products of an ecological production and the products of a common food processing operation. The thesis is divided into two basic parts, theoretical and empirical ones. The theoretical part is aimed at the technology of the milk processing. There is the description of the production of chosen types of dairy products, such as consumer milk, sour dairy products and cheese. The aim was not only to describe the technology of the milk processing and the procedures of the production of dairy products, but also to capture the most frequent sensory defects and the causes of their formation. Further, the theoretical part is aimed at the pure dairy cultures. In this section of the theoretical part there is described the procedure of their gaining, the most frequently used kinds of cultures and their defects. The last but not least in the theoretical part, there are briefly characterised the most frequently occurring diseases transmitted by milk. The processing of these pieces of information was done through the study of the technical literature and the Internet sources. In the empirical section, I examined, if the technological procedures of the milk processing and the procedures of the fresh cheese production used on the ecological farm differ from the technological procedures used by the common food company. Further, I wanted to evaluate, if the differences occur in the sensory qualities of the products of these two producers. I attempted to capture the differences in the technologies of processing with the observation directly in the factories. Two institutions were chosen for the observation. As the first one the bio farm Slunečná in the Prachatice district was chosen. A common food processing operation was the second object of the research. It was MADETA, a.s. Jindřichův Hradec. I elaborated the data gained through this research into a clearly arranged table using the application Microsoft Excel. I examined the differences in sensory quality of the products by means of sensory analysis of the chosen products. Ten non-specialist evaluators of all age groups participated in the evaluation. They received the sensory questionnaire in which they marked their subjective feeling from the product tasting using the point scale. These parameters were evaluated: colour, consistency, smell and taste of the consumer milk, yoghurt, yoghurt milk and cheese. The evaluators always had two samples of every category. One came from the ecological production and the second one from the common food processing operation. The results of the questionnaires were averaged, transformed into a table and graphically demonstrated in graphs using the application Microsoft Excel.
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Issues of quality of pork meat and boar smell
NOVÁKOVÁ, Aneta
This diploma work is focused on the processing of information concerning meat quality and boar taint. The use of boar meat is in recent years a very common theme in the area of animal welfare. In addition to traditional castration of pigs, for piglets which is physically and mentally exhausting, are now new alternatives previous occurrence of boar taint. In the first part of this work there are listed aspects of breeding pigs and boars, boar taint problems and ways to eliminate objectionable taint. Using selected methods of sensory analysis were assessed for weight samples graded boar meat. The aim was to determine the acceptability of boar taint threshold for the consumer . For the purposes of veterinary inspection in slaughterhouses in the Czech republic uses boil test to identify boar taint. In the practical part was used boil test, when evaluated in some samples found unpleasant taint. Women were more sensitive to the taint of the meat than men, wichic is caused by steroid hormones. In further tests of sensory consumer panel evaluations submitted samples according to their preferences from best to worst and then in pairs test described the intensity differences between samples. The test results were processed according to the methodology and standard of ČSN. Between samples of boar meat were found statistically significant differences at a confidence level of 95%.
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Senzory evaluation sort of meat product according to production
LIŠKOVÁ, Andrea
The topic of this thesis is sensory evaluation of a selected type of meat product, depending on a manufacturing technology. This work deals with findings on consumers' attitudes pates and evaluating the quality of selected assortment of pates selected by sensory analysis. The theoretical part is focused on the characteristics of meat products, history of pates, its types and an offer on a current market. The thesis describes different raw materials used in the manufacture of pates and production itself. The next part deals with the definition of sensory analysis, conditions and used methods. The practical part includes a questionnaire that is focused on different age group that are compared with each other, depending on the attitude of consumers towards pates. Than selected sensory methods have been tested for the selected types of pates. Finally it was involved research for the company Mauz, s.r.o., which concerned an attractiveness and cost of packing pates.
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Sensory analysis of non-alcoholic beers depending on production technology
BRABCOVÁ, Markéta
The aim of this dissertation was sensorial evaluation of non-alcoholic beers according technology of their production. Ten samples of non-alcoholic beers from different breweries were tested with sensorial analysis. Non-alcoholic beer Lobkowitz Premium and Radegast Birell were made with help of special types of yeasts. The rest of non-alcoholic beers was made by technology of controlled fermentation. Non-alcoholic beer Samson made by method of controlled fermentation gained the first place and Radegast Birell made with help of special types of yeasts gained the second place. It is not possible to specify, which one from used technologies of producing non-alcoholic beers have got a proven positive effect on the sensorial quality of beer, from identified data. Sample D (Samson) reached maximum values of complex perception of aroma, fullness, briskness and character of bitterness in sensorial evaluation of chosen criterions. The highest value of complex perception of taste was recorded at sample J (Radegast Birell). On the other hand, sample F (Budweiser Budvar) reached the lowest values of fullness, briskness and komplex perception of taste. The lowest values of komplex perception of aroma was noted in sample G (Dudák) and sample C (Bernard) had got the lowest values in complex perception of character of bitterness. Samples B (Platan) and D (Samson) contained additional sweetener E 954 (Saccharin). Saccharin is weaker than standard sugar but it leaves a bitter taste behind after ingestion. Men perceived sample B (Platan) in terms of aroma and taste negatively and in term of character of bitterness positively. Women registered only minimal differences in perception of aroma, intensity of taste and character of bitterness in this sample. Used sweetener could inluenced men´s view on taste because of its bitterness. The conducted survey also showed that in situations where the respondents can not give alcoholic beer , 80 % of men´s surveyed by opting for non-alcoholic beer . On the contrary, 87 % of women would prefer a different soft drink.
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Substitution of beet sugar with plant Stevia rebaudiana and its effect on the sensory quality of selected products.
PEŠTA, Antonín
The main objective of this thesis was to substitute beet sugar with Stevia Rebaudiana Bertoni plant extract, and to assess effect of this substitution on sensory quality of selected products. Ten different samples of cherry jam were produced, using different combination of sweeteners in each of them. As sweeteners, beet sugar and Stevia leaf extract was used. This stevia leaf extract is even 400 times sweeter than common sugar. All samples of jam underwent sensory analysis and results have been graphically processed. The results has shown that Stevia has certain effect on sensory quality.
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Assessment of quality selected bakery products for specific nutrition
ŠKOPEK, Pavel
The subject of this diploma thesis is "Assessment of quality selected bakery products for specific nutrition". Theoretical part explains the legislation for bakery products, characterizes the raw materials at tjhe input and the technological process in the production of bakery and the assessment methodes of bakery products. Practical part is focused at sensory analysis of fine pastery products called "vánočka" suitable for diabetics and obtained data are evaluated using appropriate statistical and graphical methodes.
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