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Encapsulation of caffeine
Patočková, Klára ; Pekař, Miloslav (referee) ; Márová, Ivana (advisor)
This bachelor thesis is focused on possibilities of encapsulation caffeine in micro- and nanoparticles. In the theoretical part was devoted to information about caffeine, liposomes and polysaccharides and also on the techniques of encapsulation. In the experimental part 5 different methods were used for preparation of micro- and nanoparticles with encapsulated caffeine. Caffeine was packaged into liposomes and polysaccharide particles (chitosan/alginate). Encapsulation’s effectiveness was determined by HPLC/UV-VIS. Prepared particles were monitored for size and stability by dynamic light scattering. The particles were exposed to the arteficial stomach and intestinal juices and bile acids. Particle stability and amount of released caffeine was monitored. Analytical centrifugation was used to measurement of sedimentation velocity and stability of the prepared particles. Caffeine containing particles were added in several soft drinks to determine particles amount when turbidity occurred.
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Awareness of adolescentc aboat the effect of caffeine on the human body.
ŠPIRKOVÁ, Irena
The main topic of this Bachelor thesis is the research dedicated to the level of awareness effect of caffeine on the human body of adolescentc population of the Czech Republic. The theoretical part of my work is introducing caffeine, its presence in natural items and its use as an additive to food products. A part of the thesis is describing influence of caffeine on the human body. The main part of the thesis is consisted of the research which concentrates on level of awareness effect of caffeine on the human body of adolescentc population of the Czech Republic. The research also includes parts which should establish to which consumers are aware of the content of caffeine in beverages and other food supplements containing caffeine on consumers' organisms.
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The Role of Energy and Stimulating Drinks in the Drinking Regimen of Adolescents
ŘÍHA, Jakub
The thesis deals with the consumption of energy and stimulative drinks by adolescents in the Czech Republic. This current topic is treated in the theoretical part of the thesis, in its two sections. In the first section, the important terms, such as ?adolescence? or ?digesting drinks?, are explained. The second theoretical section deals with the daily fluid intake and describes energy and stimulative drinks, their composition and their impact on human body. There is also information about the use of these drinks in combination with alcohol. The practical part of the thesis contains analysis of the consumption of energy and stimulative drinks by adolescents from 15 to 26 years of age. More than 1,200 respondents took part in the electronic research. To compare the results, there are two age groups: 15-20 years of age and 21-26 years of age. The results of the research confirm that energy drinks are consumed at the usual rate, while stimulative drinks are included in the daily fluid income of Czech adolescents very often. The main reason for consumption of these drinks is to eliminate the feeling of tiredness.
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The use of caffeine among pupils at second grade of elementary school in Vodnany.
ŠMIDMAJEROVÁ, Edita
This bachelor thesis deals with the consumption of caffeinated beverages by pupils of a secondary school in Vodňany (Czech Republic). Nowadays, the overconsumption of beverages containing caffeine is becoming a big problem among pupils. I chose this topic to find out how many pupils of a regular secondary school drink beverages containing caffeine. This work consists of both a practical as well as a theoretical part. The theoretical part consists of three main chapters. The first part describes the subject, caffeine, the effects caffeine has on the human body as well as caffeine addiction. In the second chapter I investigate products containing caffeine, their ingredients and effects on the human body. The third chapter focuses on the consumption of caffeinated beverages by teenagers. In this chapter I describe the term teenager, their eating habits and explore whether these are appropriate or not. Furthermore, I present studies focused on caffeine consumption based on the age range of the consumers, from toddlers up to the age of thirteen. In the practical part I set two goals. The first is to determine how many pupils of the investigated secondary school drink caffeinated beverages. My second goal is to determine at which occasions they drink these drinks. Furthermore, I establish two research questions and two hypotheses. My first hypothesis assumes that female pupils of the secondary school in question drink in general more caffeinated beverages than male pupils. However, based on the evaluation of the obtained data I found out, that the female pupils do not consume more caffenated drinks than male pupils. My second hypothesis assumes that pupils drink caffeinated beverages more often during the week than on the weekend. But even this hypothesis was not confirmed, as the survey shows that pupils do not consume caffenited drinks more often on weekdays than weekend. Both hypotheses were statistically evaluated using the Excel chi-square test. The working method is described in the practical part. The practical part was carried out using quantitative research methods, i.e. a survey. The survey was anonymous and the questionnaire was for both genders identical. It consisted of 16 questions that focused on the consumption of beverages containing caffeine. The survey consisted of closed, half-closed as well as opened questions. The data were collected at the mentioned secondary school in Vodňany. The questionnaire was given to pupils of the 7th, 8th and 9th grade, aged between 12 and 15 years. In total, 80 questionnaires were distributed among the pupils; the return rate was 100%, as they were distributed duringclass while a teacher was present. The analysis of the questionnaires gave the following results: the most favourite caffeinated beverage among students is coke. The biggest proportion of pupils drinks as much as 0.5 liters per day of coke. The most popular brands of caffeinated beverages are Coca-Cola, Kofola, Monster and Red Bull. Pupils mostlyconsume caffeinated drinks on the weekend with friends or family. My work could be used as a source of information for the general public, or as a basis for further studies of students who are dealing with the issue of caffeine.
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The influence of caffeine on the change of reaction time.
BAUEROVÁ, Miroslava
Thesis is focusing on influence of caffeine on the change of reaction time of individual. The theoretical part consists of the introduction of the specific subject and is following by information about positive and negative caffeine effect on the human body. Certain part of dissertation presents some liquid food products, where caffeine is included. The description of the reaction time of the individual before and after consumption is mentioned as well. The practical part of thesis pays attention to the experimentation with the pre-selected sample of person. The test itself was based upon usage of the reaction measurement tool with the optical stimulus for inputs. The objective of the practical part was to compare the influence of caffeine, and its specific amount, on the reaction abilities of selected individuals. Recorded data have been than statically evaluated, and prepared to final comparison. Based on receiving information the unequivocal deduction was determined.
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Caffeine and its importance in the dietary intake
ANDRÝSKOVÁ, Zuzana
Bachelor thesis presents the results of studies on the importance of caffeine in dieting of adolescents. The theoretical part of the thesis deals with the characteristics of caffeine, describes both desirable and undesirable effects of caffeine on the human body and presents his best-known sources. The theoretical part describes the characteristics of adolescence, there is introduced appropriate nutrition, fluid intake and the movement in the life of adolescents. Practical part of thesis evaluates the most preferred types of caffeine beverages and dietary supplements, frequency of consumption and their purpose in dieting of adolescents. It also investigates how the caffeine food is got adolescents in awareness, where is most often acquired and consumed. The analysis is based on quantitative research, which was conducted by using anonymous questionnaires. The obtained data are processed in graphical and tabular form.
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Importance of caffeine in the diet of pubescents
RUBEŠOVÁ, Jitka
The topic of this thesis is importance of caffeine in the diet of pubescents. The theoretical part deals with caffeine and its effect on the human body, describes the best known sources of caffeine. Furthermore, the period of pubescence is characterized in terms of development, nutrition and movement. The graduation thesis presents a quantitative research in which a questionnaire is used as the main research method. The targeted group comprises pupils aged 12-15 years. The practical part describes a representation of caffeine in the diet of pubescents including frequency of consumption of various kinds of drinks containing caffeine. It also points to preffered sources of caffeine on pubescents and the reasons for their consumption.
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DNA damage response in green algae Chlamydomonas reinhardtii and Scenedesmus quadricauda
HLAVOVÁ, Monika
The effect of FdUrd, zeocin, caffeine and their combination on the cell cycle of green algae Chlamydomonas reinhardtii and Scenedesmus quadricauda and response of these model organisms to DNA damage were studied. Both, FdUrd and zeocin, caused DNA damage that led to cell cycle arrest in these algae. In contrast, caffeine partially abolished G2 phase block imposed by zeocin. Protein levels of three crucial cell cycle regulators - CdkA, CdkB and Wee1 kinases were measured to identify mechanisms controlling reaction to DNA damage.
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Legal drugs and their use by students at secondary schools in the of Tábor district.
PECLOVÁ, Kristýna
Legal drugs and their use by students at secondary schools in the Tábor district Drugs currently represent a major problem worldwide, affecting each of us. The Czech Republic ranks among the countries with the increasing trend of excessive alcohol consumption. Alcohol consumption in this society is considered an absolutely normal and tolerated phenomenon, equally as smoking of tobacco products and excessive use of non-prescription drugs. Alcohol and drugs are not only legal but their consumption is offered practically wherever you go. The period of adolescence involves experimenting as its natural part. Legal drugs are the first things the adolescents experiment with and for this reason my bachelor thesis focuses on the use of alcohol, tobacco, caffeine and medicinal drugs. The theoretical part of the thesis summarizes facts about the individual legal drugs (alcohol, tobacco, caffeine, medicinal drugs) and analyzes related issues. The purpose of my bachelor thesis was to find out facts about the use of legal drugs at secondary schools in the district of Tábor and I have used some partial goals and previously established hypotheses to achieve it. The partial goals included identification of the first experience with legal drugs and quantities consumed by secondary school students. In order to verify the established hypotheses I have used quantitative research and the method of interviewing by questionnaires. The research group consisted of 290 respondents, from which 108 boys and 101 girls. 7 hypotheses were formulated for the research. The hypothesis H1 assumed that boys consume alcohol more often than girls. The hypothesis H2 assumed that boys consume tobacco more often than girls. The hypothesis H3 assumed that boys have the first experience with alcohol earlier than girls. The hypothesis H4 assumed that boys have the first experience with tobacco earlier than girls. The hypothesis H5 assumed girls consume more caffeine than boys. The hypothesis H6 assumed that girls consume more medical drugs than boys. The hypothesis H7 assumed that students of secondary vocational schools consume more alcohol than students of secondary comprehensive schools. All those previously established hypotheses have been confirmed. This bachelor thesis may be used by the general public and by professionals in the Czech Republic to increase the level of awareness about the use of legal drugs. The thesis has brought some new findings and it has mapped the situation in consumption of legal drugs by students of secondary schools in the district of Tábor. Therefore the thesis may contribute to an effective prevention among this group of adolescent youth.
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