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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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Výroba, sortiment a kvalita fermentovaných mléčných výrobků
Nováková, Romana
Fermented dairy products are among the traditional dairy products. Among consumers of these products are very popular, thanks to the diverse composition and for its dietary and therapeutic effect. For production, the use so called. starters, which culture is composed of one or more species or strains of lactic acid bacteria. The basic principle is the production of lactic fermentation, which adds durability, causing changes in sensory properties and increases the nutritional value of products. This work is focused on less traditional products, mainly on the Nordic fermented milk. Generally, these products are characterized by their characteristic flavor and very viscous and sticky texture. In the context of this thesis was created questionnaire and compared the sensory quality of the three selected products.
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Sensory quality of fruit juices
Hamalová, Veronika ; Hrstka, Miroslav (referee) ; Vítová, Eva (advisor)
This Bachelor‘s thesis deals with the evaluation of sensory quality of orange juice from different producers. All selected samples were made from concentrate. In total five samples bought in Tesco Stores CZ in Brno were evaluated The theoretical part focuses on the composition and properties of orange and orange juice, and their production technology. The selected methods for sensory evaluation of foods are mentioned. The definition of orange juice according to Czech Standard 56 8541 is also presented in this part. The appearance, color, taste, smell and consistency were evaluated using ordinal scales, taste development using graphic scale. The ranking test was also included. Written results were graphically evaluated and statistically treated.
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Sensory quality of chosen types of meat products
Javorská, Kateřina ; Sůkalová, Kateřina (referee) ; Vítová, Eva (advisor)
This Bachelor’s thesis deals with the evaluation of sensory quality of meat products. The 5 samples of pork ham of different quality and from different producers were selected for evaluation. The theoretical part focuses on the composition and properties of meat and meat products, and their production technology. The selected methods for sensory evaluation of quality are also mentioned. Ordinal and graphical scales were used for sensory evaluation of samples. The assessors evaluated these basic characteristics of the ham samples - color, appearance in the cut, preparation, consistency, smell, taste, saltiness and tenderness. The results were written down in the prepared questionnaires which were subsequently statistically and graphically evaluated. Sensory analysis was performed by group of students from the Faculty of Chemistry BUT.
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Sensory quality of chosen types of beer
Lišková, Michaela ; Divišová, Radka (referee) ; Vítová, Eva (advisor)
This bachelor thesis deals with the sensory guality of chosen types of beer. The teoretical part was focused on the production of malt and beer and raw materials needed and also an introduction to sensory analysis was described. The experimental part was focused on evaluation itself. Nineteen untrained assesors were invited for sensory evaluation, who evaluated five selected beer kinds using the preprepared form. Unstructured graphic scale with a verbal description of anchor points was used to evaluate the appearance and color, taste and odour, fullness, bite, foaming, bitterness and any off-taste or off-odour of each sample. Five-point category ordinal scale was used for assessment of the overal acceptability of the samples. Results of the analysis were then evaluated graphically and statistically.
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Evaluation of the sensory quality of bread
Mahdalová, Martina ; Vránová, Dana (referee) ; Vítová, Eva (advisor)
This work deals with the evaluation of sensory quality of selected samples of bread. The samples of bread were bought in TESCO Stores a. s. ČR in Brno. Totally five samples were evaluated, two of them were rye-wheat and three of them were wheat-rye. All products were packaged and sliced. Purchased samples were subjected to sensory evaluation by the ranking test and scale tests. The assessors judged three main organoleptic properties of bread – taste, odour (aroma) and texture. The results were written down in the questionnaires and consequently graphically and statistically evaluated. The assessors which took part in sensory analysis were chosen from students of Faculty of chemistry BUT.
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Preparation and qualitative evaluation of pasta with various portion of quinoa flour
BIGASOVÁ, Věra
Quinoa (Chenopodium quinoa) is a very nutritionally valuable crop with versatility. The aim of this work was a practical experiment to test the possibility of pasta production with different proportions of quinoa flour and evaluate their selected qualitative properties. The thesis includes also photos of pasta production and the results of questionnaires summarizing the views of consumers on pasta containing quinoa flour. We can advise to use of quinoa flour up to 30% share for the production of quinoa-semolina pasta. Adding eggs or the pregelatinized quinoa starch inches the possible share of quinoa in the pasta up to 40% representation.
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