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Vyhodnocení kvality a trvanlivosti sýrů s protektivní kulturou
Skýpalová, Veronika
The aim of this thesis is to investigate the topic of protective cultures. The work deals with the effects of protective cultures on semi-hard ripened cheeses, and their impact on a process of ageing on given types of cheese. An important part of this thesis represented in a chapter that deals with bacteriocins, their properties and effect in food processing. The effect of protective cultures on the chemical properties is observed in the practical part of the thesis. This part monitors mainly acidity of cheeses, pH, dry matter, and content of salt in cheeses. Given indicators are compared with and without addition of protective cultures on cheeses. In conclusion, this thesis observes if the protective cultures affect quality and shelf-life of semi-hard ripened cheeses.
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Mikrobiologie mléka a sýrů vyráběných na farmách
Nedomová, Kristýna
Bachelor thesis summarizes the findings of the mikrobiology of milk and cheese produced on farms. The work includes theoretical and practical part. Literature review is focused on partikula rmicroorganisms, which are important from a technological point of view. Furthermore, the thesis describes the undesirable microorganisms and it presents the measures to fight with them. Were determined experimentally selected groups of microorganisms – total number of microorganisms, coliform microorganisms, lactic acid bacteria, psychrotrophic microorganisms, enterococci, yeasts and fungi in the three samples of milk and in free samples of cheese.
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Způsoby solení sýrů
Glanzová, Štěpánka
This bachelor thesis deals with the issue of salting cheeses. In the first part of thesis, we will focus on the general sorting of cheese, which describes how to distinguish different types of cheese production and the differences between them. The focus will also be on cheese production, where we can describe how we can influence production, but also what raw materials we use to produce cheese. The final chapter is the salting of the cheese itself, in which the effect of salt on cheese is thoroughly analyzed, including the exact specification according to the type of cheese we produce. The aim of this work is to acquaint the reader with the overall production of cheese, what is the effect of salting on the result cheese and what defects can cause bad salting.
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Elemental analysis of cheese with white mold on the surface
Pavlechová, Alžbeta ; Vítová, Eva (referee) ; Diviš, Pavel (advisor)
This Master's thesis deals with elementary analysis of cheeses with white mold on the surface. Theoretical part describes general characteristics of cheese, classification of cheeses, their nutritional aspects and characteristics of cheeses with white mold on the surface. Large part is focused on description of mineral substances selected for analysis. At the end of the theoretical part, the Kjeldahl method and emission spectrometry with inductively coupled plasma (ICP-OES) were described. Experimental part deals with preparation of samples, approach of analysis and processing of measured results. Eleven samples of cheeses were used for analysis. These samples were from Czech Republic, France and Slovak Republic. Kjeldahl method was used to determine protein contents and ICP-OES was used for elemental analysis. The results were compared to each other and also with results from other studies. Subsequently, they were statistically processed and evaluated in the final part.
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Dairy products in human nutrition, labelling according to czech legislation; consumer information and preferences
Dovolová, Barbora ; Kudlová, Eva (advisor) ; Dostálová, Jana (referee)
This bachelor thesis evaluates the dairy products labelling in the Czech Republic based on the requirements of the Czech legislation. It also pursues consumer's taste preferences, their interest and awareness of the dairy products labelling. The theoretical section mentions the history of dairying and the importance of milk products in human nutrition. The following chapters present individual dairy products and it described their production, labeling and division into kinds. The practical section reveals that the dairy products are labeled in accordance with the Czech legislation. The results are presented in the form of photos and tables (mini photobook). This part also examines whether the adult people interest in the dairy product labeling, how to orient in a range of dairy products and which products they prefer. The product evaluation was carried out in two big stores in Jablonec nad Nisou by using photographs. It was found that majority of companies indicates their milk products correctly. Identified deviations were discovered in the labelling of nutrition declaration or allergens. This is a relatively new requirements but very important. The questionnaire was found that 68 percent of people read informations on dairy products voluntarily. Most of the respondents consume especially milk, yoghurts and...
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About the Cheese from Mokrá in Other Perspective
Prokopová, Martina ; Pauknerová, Karolína (advisor) ; Tošner, Jiří (referee)
The topic of the thesis is the production of cheese in a slovak village Mokrá. It is described from the perspective of Actors-Network theory and from the practice-turn point of view. The thesis combines the results of an ethnographic research on the location with an experimental ethnographic writing. It all comes from the notion, that cheese can be considered as an actor, that is able to influence physical and socio-cultural life of the cheesemongers. The cheese is taken as hybrid, natural, discursive and collective character. The author focuses on the agency of cheese primarily in the relationship to the bodies of the cheesemongers using the concept of practical understanding, as well as in the relationship to the landscape using the concept of terroir and taskscapes. In order to see the phenomenon of homemade cheese from a new perspective, the author writes from different space-time perspectives. At the beginning the space-time perspective is extended, so cheese is perceived as an event, what enables us to find new actors in the cheese production process. Afterwards the perspective is reduced to the world of the lactic acid bacteria to discover their impact on the cheese production, its taste and quality and on the discurse of micro-biopolitics. A separate part of the thesis is focused on the...
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The market for cheeses and perspectives further development
HŘEBEČKOVÁ, Věra
This thesis focuses on the literature review process that assesses the nutritional importance of cheese consumption trends in recent years, as well as offer cheese market network, including the introduction of innovative and consumer trends of the industry. This thesis was completed during the processing of intermediate destination, and develop a simple questionnaire focused on the issue of purchase and consumption of cheeses with selected participants. The results of an exploratory survey are provided at the end of the thesis and inform on the essential features shopping and consumer behavior on the market in cheese.
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Acid whey utilization for beverage production
Šíša, Daniel ; Legarová, Veronika (advisor) ; Musilová, Šárka (referee)
Whey is a byproduct of cheese, curd and casein manufacture and as an excellent source of proteins, vitamins, minerals and lactose can be used in wide range of industrial production. If treated as waste material without further processing, it can have negative impact on the environment.
Main components of whey are water (93% of total volume), lactose (70 to 72% of dry matter), whey protein (8 to 10% solids), and minerals (12 to 15% solids). Of the minerals, most abundant are magnesium, phosphorus, calcium, potassium, sodium, zinc, and their salts which are passed to whey from milk. Predominantly represented vitamins are water-soluble vitamins (B1, B2, B12, B6, and C) from which the vitamins B2, B12 and C are bound to the whey proteins. The most abundant whey proteins are betalactoglobulin, alfa lactalbumin, GMP (glycomacropeptide), bovine serum albumin, immunoglobulins, lactoferrin and lactoperoxidase. For each of these proteins have been demonstrated or at least implied, unique functional, nutritional or nutraceutical properties.
The aim of the thesis was to compile a literature review focused on the possibility of using whey from the production of cheese and curd as raw materials for the manufacture of various types of beverages and monitoring the effect of the addition of various flavor components and whey proteins on the sensory quality of the drink prepared from fresh sour whey.
The hypothesis of this work was that flavored whey drinks made from acid whey supplemented with whey protein have a higher sensory quality score than flavored drinks without the addition of whey protein and that whey drinks flavored with mango flavour are more acceptable by consumers they are able to mask undesirable off-tastes of sour whey better than flavor peaches, cherries and black currants.
In all specimens, the effect of 8 different recipes and flavors of peaches, cherries, mango and blackcurrant on the final sensory quality and acceptability to consumers was observed. It was found that the best rated drinks were of cherry and mango flavors. Beverages with the addition of mango juice were able to reliably mask natural off-taste of whey, which supports the hypothesis about the appropriateness of using this flavor. Drinks with peach flavor were evaluated to be of the worst senzory quality. As of the best sensory quality were evaluated drinks flavored with cherry flavor, which reached the best overall evaluation. In all variants of formulas was observed that drinks with added WPC achieved better overall evaluation than similar variations without addition of WPC. Statistically significant results of this finding, however, were observed only in the context of mango flavors.
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Microbiological quality of milk for cheese production
Korous, Jan ; Legarová, Veronika (advisor) ; Vladimír, Vladimír (referee)
This bachelor thesis is focused on microbiological quality of milk for cheese production. Besides that, it informs about the composition of milk and the processes in cheese production.
The composition of milk differs between animal species. Lactose is the main sugar of milk, with content about 4-8 %. The majority of fat found in milk is triacylglycerol type. Casein is the most important protein, which occurs in three fractions (alpha, beta a kappa). Milk also contains various minerals and vitamins. The most important mineral is calcium, which plays an important role in cheese production. The milk composition is a suitable environment for the growth of microorganisms (Pseudomonas, Enterobacter, etc.), that can contaminate raw milk. Despite this risk, the raw milk is commonly used for cheese production, because it gives the cheese better structure and taste compared with the treated milk. However, the majority of cheeses are manufactured from the treated milk. In most cases, the milk is treated by heat, especially by pasteurization and ultrahigh temperature. These procedures kill microorganisms in milk. In some cases, milk can be contaminated again after the treatment or by inactive spores that survived the treatment. They can become active under favourable conditions, for example during cheese making.
Cheeses can be divided into groups by several criteria (type of coagulation, water content or fat content in dry matter). Starting cultures are used during cheese making from treated milk. Thermophilic starting culture Lactobacillus casei is used for manufacturing of soft cheeses and cheeses with high-heated curd. Cheeses with holes are made by fermentation (Propionibacterium freudenreichii). Mesophilic bacteria Lactobacillus lactis are used for production of cheeses with low-heated curd. There are many other cultures used in cheese making. Another important process during a cheese making is coagulation. During this process, the milk fat is coagulated by enzymes (chymosin, pepsin). After the coagulation, the curd is cut and forms soft grains, which exude whey. The grains are often heated for the better whey secretion. Salt is used during the cheese production to slow the activity of microorganisms and enzymes and it also gives better taste to the final product. Cheese is then let to age, during this period of time, biochemical processes occur and unique characteristics of the cheese are gained.
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