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Sensory evaluation of drinks enriched with extracts of herbs
Scholzová, Kristýna ; Pořízka, Jaromír (referee) ; Vítová, Eva (advisor)
This diploma thesis deals with sensory evaluation of herbal non-alcoholic beverages, being a part of a new product development. The theoretical part provides information concerning chemical composition, health effects, food applications and aroma compounds of the herbs of interest (peppermint (Mentha piperita), sage (Salvia officinalis), St. John’s wort (Hypericum perforatum) and lemon balm (Melissa officinalis). Another topic is a description of sensory methods, requirements and arrangement of the analysis, statistical methods, and also technological processes leading to herbal syrups and beverages production. The practical part comprises sensory analysis of a few, newly designed, formulas of one-component and two-component alcohol free herbal beverages. The sensory panel consisted of 40 students of master's and also doctoral study programme at Faculty of chemistry, University of Technology Brno. Four subsequent experiments are introduced, each of them consisting of a few sensory tests and including corresponding sensory forms attached. The sensory tests arrangement was based on currently valid Czech Technical Standards, using a ranking, descriptive, paired comparison, sensory profile testing and scaling methods. For the purpose of statistical evaluation, Friedman, Kruskal-Wallis, PCA and Faktor analysis were used. Level of abilities and sensory experience of panelists were found comparable to consumer testing. The results include sensory characteristics of all of the beverages tested. In general, the one-component beverages were preferred to the two-component beverages and the additive colouring with aronia concentrate wasn´t found any benefitial, from the sensory point of view. The consumer questionnaire proved all of the samples to be very promising, but based on the sensory results, we would consider the mint and the sage-mint beverages being the most potentialy applicable samples.
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Introducing of method of pyridoxine determination by liquid chromatography in food products and resources
Nechyba, Ondřej ; Benešová, Karolína (referee) ; Vespalcová, Milena (advisor)
This master‘s thesis deals with quantification of vitamin B6 in beverages, food supplements and raw materials in food industry. The literature retrieval part summarizes general information about vitamines, vitamine B6, nicotine acid and vitamine B1. Further on in this part there is described principle of high pressure liquid chromatography and quantification of individual vitamines. In the experimental there are listed used tools, apparatus and chemicals. There is described preparation of idividual samples of food supplements, energy drinks, multivitamine drinks, beers and brewer’s malts. This chapter also contains information about chromatographic separatory systems Shimadzu and SpectraSystem. The quantification was performed by high pressure liquid chromatography on a reverse phase with gradient elution and two ways of detection, fluorescent and spectrofotmetric. The result of experimental activities and vitamine content in analysed samples are presented in the next chapter. In the final contains summarization of results obtained in experimental part. The maser’s thesis was measured in the laboratory of Institute of Food Science and Biotechnology, Faculty of Chemistry, Brno University of Technology.
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3D tisknuté sensory pro detekci cukru v nápojích
Zichová, Anežka
Sugars are one of the most common ingredients in food industry, due to their diverse usage as technological component as well as sweetening element. The issue of sugar utilization is not only topic of food industry but plays a key role in human nutrition at the same time. The intake of simple sugars from food, particularly from sweetened beverages, is a major concern from a nutritional standpoint. Carbohydrates can be detected in variety of ways. A literature review was conducted on the methods used in food science, which is based on the previous characterization of the most frequently used sugars in food industry like sucrose, maltose, glucose, fructose, inverted sugar, and glucose-fructose syrup. The chemical, technological and nutritional properties of carbohydrates were described. Considering this examination, 3D printed electrodes were designed for detection of sugar, namely glucose, in beverages. In consideration of the available literature, electrochemical enzymatic biosensors were designed, using glucose oxidase as the sensing element to detect glucose in beverages. The electrodes, carrying the enzyme, were printed from PLA and graphene based conductive filaments. The electrodes were activated in chemical and electrochemical way. To bind the enzyme, a technique based on cross-linking and immobilization was used. Chronoamperometry and cyclic voltammetry were used to test the biosensor. Afterwards the real sample of a fruit juice-based non-alcoholic beverage was examined. The results were interpreted in the context of the applicable legislation of the European Union and, likewise, the legislation of the Czech Republic, in regard to the required data on food labels.
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Analysis of drinking regime student TUKE students in Košiciach (SK)
JANDA, Petr
The bachelor thesis focuses on the issue of the drinking regime of a select group of people, namely Tuke students in Košice. In the theoretical section, I conducted a literary research of available resources relating to the subject. This section is divided into two chapters. The first chapter deals with the importance of water to the human organism and the general principles of the drinking regime. It also contains insights into water, bottled mineral waters, sweetened sodas, juices, milk and addresses the issue of alcoholic and non-alcoholic drinks in drinking mode and their effect on the human organism. As part of the second chapter, I discuss the quality of both bottled and unbottled water in the Košice region and Slovakia, where I carried out research investigations. The research methodology is described in the practical section. I chose a questionnaire method to collect the data. Partial results are characterised and discussed at the conclusion of the work.
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Konzervační postupy v nápojovém průmyslu
Trněná, Kateřina
This bachelor thesis focuses primarily on the topic of preservation processes in the beverage industry. The first part deals with general basic substance composition of both alcoholic and non-alcoholic beverages, and their division. Furthermore, the thesis focuses on the important microflora of beverages in the sence of both positive and negative way of causing there ongoing processes. The second part deals with individual procedures of beverages preservation, with the aim of preserving beverages, the extension of its shelf life, and natural and chemical substances used in beverage production.
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Využití méně známých druhů ovoce pro výrobu nápojů
Oherová, Kristýna
The Master' s thesis was made on Department of Post-Harvest Technology of Horticulture Faculty in Lednice. In the first chapter is defineded less common fruits and their healthy benefits. The main information about less common fruits and their processing are desribed in the other chapters. The experimental part include information of fresh fruits - honeysuckle, black chokeberry, hawthorn and their antioxidant activity. Antioxidant activity was detected by FRAP and DPPH. There is described the beverage production and the results of sensory analisis.
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Food Position and habits in the group of second grade students and students of high school on Příbramsku
HUMŇALOVÁ, Aneta
This bachelor´s thesis deals with the problems of nutrition and eating habits of pubescents and adolescents in Příbram and its surroundings. The theoretical part focuses on nutrition, its basic components, on general principles as well as recommendation including the food pyramid and the healthy eating plate. Furthermore, the bachelor´s thesis focuses on given group of children - on composition of their meals, mistakes in nutrition, diets and its related eating disorders and alternative nutrition. The practical part focuses on questionnaire survey. The survey was made at tree elementary schools and four high schools in Příbram and its surroundings in the period of time from December 2018 until February 2019. The questionnaires included questions concerning eating habits, interests for healthy meals, experience with diets and supportive means, supplements. The total number includes 640 probands, 335 coming from elementary schools and 305 students coming from high schools. Questions and results of the survey are presented chronologically in accordance with sequence in the survey.
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Analysis of drinking mode of university students University of South Bohemia.
VOBORNÍK, Tomáš
The theme of this graduation thesis is Analysis of drinking mode students of University of South Bohemia in České Budějovice. The theoretical part is focused on function of water in human body. Different sources of drinking water and statndarts for using are mentioned there. The next part deals with alcoholic and nonalcoholic beverages in drinking mode and their effect on human body. Drinking mode is described from the point of view by different groups. In the end of theoretical part age group of students who is the research focused on is presented in detail. The practical part was realized by quantitative form which was distribuated among students. The aim of this research was described drinking mode of students during the day. I focused on volume and timing of fluid intake. Additionaly, I found out which types of drinks are consumed among students and compared gender differences within the researched group.
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