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Iodine in food
Laba, Marija ; Babák, Libor (referee) ; Vránová, Dana (advisor)
This research addresses the importance of iodine as a micronutrient for the human body. Although it seems that the required daily intake is small and it is calculated in micrograms, it is equally important for the organism. The issue deals and summarizes the occurrence of this element in food. Insufficient or excess intake causes serious illness. Based on this research, it is possible to imagine a supply of iodine in the Czech Republic and in the world. The collected information shows that iodine intake is different and it is depending on food, health status or age. The locality in which we live plays a big roli. Currently the salt iodization and wrong eating cause the growing problem of excessive intake of iodine in the body. Since the problem is solved only in theory, we can find a description of the most ideal method for determining the amount of iodine in food.
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Determination of iodine in food
Malčíková, Hana ; Reichstädter, Marek (referee) ; Diviš, Pavel (advisor)
The bachelor thesis deals with the optimization of ICP-OES method to determination of iodine in mineral waters. At first, the Theoretic part characterize the iodine in general, next it concerns with it as the essential/biogenic element, which is necessary for the proper functioning of the human organism, with its occurrence in food and with its industrial utilization. In next chapters the thesis is describing analytical methods of iodine determination specifically ion chromatography and inductively coupled plasma optical emission spectrometry. The principle and instrumentation description of both methods are found. The Experimental part is focused on optimization of ICP-OES methods, device setup for IC, on preparation of samples of mineral waters and the samples analysis using both methods. The results of the Experimental part show a content of iodine in mineral waters accessible in the Czech Republic and the Slovak Republic.
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Iodine literacy of pregnant women
Kazdová, Kateřina ; Selinger, Eliška (advisor) ; Heniková, Marina (referee)
This work deals with the iodine literacy of pregnant women, which means the knowledge of these women about the role of iodine in their diet. Iodine is an element whose intake is essential to produce thyroid hormones. Its deficiency has an adverse effect on the health of vulnerable groups, such as pregnant women and their children. This deficit is a problem in our country and increasing iodine literacy could help reduce it. The aim of this bachelor's thesis is to verify whether there is a relationship between the iodine literacy of pregnant women and the frequency of inclusion of foods containing iodine in their diet. Another goal is also to find a connection between the level of this literacy and the level of information of women and to find out from which sources women most often draw information. The work also includes an analysis of the use of dietary supplements and their composition. 95 women participated in the research. All of them received a questionnaire in which they answered questions about not only iodine literacy itself, but also information about nutrition, the way they eat, nutritional supplements and other topics. The frequency of consumption of certain foods was also analyzed. Half of these women visited outpatient clinics for both physiological and high-risk pregnancies of the...
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Obsah jodu v mléce z konvenčních a ekologických chovů
HOLÍKOVÁ, Michaela
This bachelor thesis deals with the determination and evaluation of iodine content in milk obtained from organic and conventional farms. The investigation was carried out from June to December 2021. The observed results of iodine content in organic milk were compared with the results of iodine content in conventional milk. Furthermore, the iodine content of the bio-milk products was determined.
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Štítná žláza prasat
ŠTĚCHOVÁ, Petra
Thyroid gland is very important endocrine organ that interferes with a number of processes in the body. Sufficient iodine saturation of animals is essential for optimal production of thyroid hormones. The aim of the bachelor's thesis was to determine iodine supply of slaughter pigs and morphometric parameters of thyroid glands in selected individuals. The study included 27 castrated hybrids of Czech landrace and Pietrain. Iodine content in urine was determined using the Sandell - Kolthoff spectrophotometric method. Thyroid parameters were determined microscopically: length, width, outer and inner area of the follicles and thyrocyte height. The representation of individual size categories of follicles was also determined. The average content of urinary iodine in the observed group was 350.8+-184.3 ug/l, the maximum was 608 ug/l and the minimum was 76 ug/l. Optimally saturated with iodine was 44.44 % of individuals, 11.11 % had a deficiency and 44.44 % an excess of iodine. The average length of the thyroid follicle was 149.3+-64.8 um, width 105.9+-50.6 um, outer area 16810.6+-18030.0 um2, inner area 14318.4+-16985.2 um2 and thyrocyte height 6.2+-2.6 um. In the thyroid glands was 9.4 % small, 62.8 % medium and 27.8 % large follicles. In the selected group of individuals, the impact of different iodine saturation of animals on all monitored thyroid parameters was demonstrated.
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Iodine content in milk and milk produkts
DAVIDOVÁ, Lucie
The subject of the dissertation was to find out and evaluate the iodine content in milk products in a distribution network in the Czech Republic. The dissertation brings update information about the iodine content in consumer milk and white yogurt which are a common part of alimentation for the majority of human population. Sampling was carried out in a sale network during 2007 and 2008. Altogether, 43 samplers of consumer milk and 59 samplers of white yogurt were taken. The iodine content in products was determined with colometric method by Sandell-Kolthoff. The average iodine content in consumer milk in 2007 was 300,5 {$\mu$}g {$\bullet$} l-1 and 310,2 {$\mu$}g {$\bullet$} l-1 in 2008. The maximal iodine content in milk reached the level of 404,8 {$\mu$}g {$\bullet$} l-1 (2007) and 732,0 {$\mu$}g {$\bullet$} l-1 (2008). The lowest level of iodine content in white yogurt in 2007 was at the level of 406,0 {$\mu$}g {$\bullet$} kg-1 and 422,7 {$\mu$}g {$\bullet$} kg-1 in 2008. Comparing years 2005 and 2006 there was recorded a slight decrease at these products. Some differences were recorded at different milk product producers and as well as the season has got a considerable influence. If the overall average milk and milk products consumption makes 0,64 litre per person then the daily recomended portion is covered by 130 per cent.
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The content of the micronutrients in consumer eggs
DUŠOVÁ, Hana
The aim of the diploma work was to analyticly verify the actual status of the micronutrients (iodine, copper, zinc and manganese) in consumer eggs. The results of the research gives information about the content of the observed micronutrients in egg yolk and the importance of eggs as a source of these micronutrients for the nutrition of people. The eggs came from 13 small flocks and 7 large flocks in both 2007 and 2008. The average content of iodine in fresh matter of yolk of the eggs from the large flocks in 2007 was 1285,2 {$\pm$} 861,6 {$\mu$}g{$\bullet$}kg-1, zinc 63,71 {$\pm$} 31,08 mg{$\bullet$}kg-1, copper 7,42 {$\pm$} 4,88 mg{$\bullet$}kg-1 and manganese 1,02 {$\pm$} 0,84 mg{$\bullet$}kg-1. The average content of iodine in fresh matter of yolk of the eggs from the small flocks in 2007 was 387,1 {$\pm$} 214,3 {$\mu$}g{$\bullet$}kg-1, Cu 10,90 {$\pm$} 5,28 mg{$\bullet$}kg-1, Zn 73,54 {$\pm$} 44,33 mg{$\bullet$}kg-1 a Mn 1,28 {$\pm$} 0,75 mg{$\bullet$}kg-1. In 2008 the average concentration of iodine in fresh matter of yolk of the eggs from the large flocks was 1071,9 {$\pm$} 543,9 {$\mu$}g{$\bullet$}kg-1, Cu 20,63 {$\pm$} 8,85 mg{$\bullet$}kg-1, Zn 29,59 {$\pm$} 8,67 mg{$\bullet$}kg-1 a Mn 1,42 {$\pm$} 0,62 mg{$\bullet$}kg-1. In 2008 the average concentration of iodine in fresh matter of yolk of the eggs from the small flocks was 340,7 {$\pm$} 330,6 {$\mu$}g{$\bullet$}kg-1, Cu 17,95 {$\pm$} 6,19 mg{$\bullet$}kg-1, Zn 33,10 {$\pm$} 7,97 mg{$\bullet$}kg-1 and Mn 1,22 {$\pm$} 0,54 mg{$\bullet$}kg-1. The Eggs from the large flocks cover 6,8 {--} 13,5% of the daily iodine requirement in adults, 13 {--} 17,3% of copper, only 2,5 {--} 3,1% of zinc and 0,4 {--} 1,1% of manganese. The gained results imply that only the content of iodine in the egg yolk is evidently affected by the intake of it in the feeding rations, the intensity of the egg production and the stage of the laying cycle. The stated relations were not definite with the other elements. The concentration of iodine in the egg yolk was assessed spectrophotometrically by the method of Sandell {--} Kolthoff, modified by Bednář et al., (1964). The content of zinc, manganese and copper in the egg yolk were assessed by the method of atomic absorption spectroscopy (AAS).
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Foods affecting function of the thyroid glande
Ciprová, Markéta ; Chrpová, Diana (advisor) ; Ezechiášová, Věra (referee)
6 Abstract Basis: This master's thesis deals with the issue of foods affecting thyroid function. The thyroid gland is an important endocrine organ involved in many bodily processes, it is completely dependent on external iodine intake and at the same time it is susceptible to some naturally occurring antinutritive substances. The main subject of research were therefore the sources of iodine and strumigenic substances in the diet and their occurrence in the diet of adults. The main sources for this thesis include the monograph Thyroid Gland, organized by Zdeňka Límanová, websites of professional institutions of the Ministry of Health of the Czech Republic and the World Health Organization and of course current studies dealing with this issue available in world health databases. The topic was chosen by the author on the basis of finding current topics in the field of nutrition, that have not yet been reserched by other students in the Nutrition Specialist field of study in recent years. Aims: The primary goal of the master's thesis was to examine and process current issues of thyroid function, especially in connection with the consumption of foods that affect this function. For this purpose, a questionnaire was compiled to obtain sufficient base and data to determine the average consumption of iodine and...
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