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Agrotechnická opatření při pěstování a sklizni Stévie sladké (Stevia Rebaudiana Bertoni) v polních podmínkách
HAUSEROVÁ, Tereza
Stevia or Stevia rebaudina Bertoni is a plant with very intresting but up to this date not very utilised potential. It a subtropical plant with a sweeting power us much as 300 times higher than in case of sucrose. It is often used as a compensation for sugar- sweetener, suitable for diabetics and people who suffer from overweight. There is processed the characteristics of the plant, botanical description, conditions of cultivation and chemical composition. The practical part elaborates on growing stevia, her germination, reproduction, growing in field conditions and hibernation. The purpose of the thesis was to expand the knowledge regarding cultivation, reproduction methods and wintering options of the stevia plants. A field and a greenhouse experiments were staged with a focus on temperature indicators during the growing season and their impact on the total number of wintered plants. The dry matter yield of the plants was rated per an area unit and statistical processing with experiment results.
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Vliv podmínek prostředí na pěstování Stévie sladké (Stevia rebaudiana Bertoni)
HAVLOVÁ, Martina
Stevia or Stevia rebaudiana Bertoni are two of the numerous names of this subtropical plant with a sweetening power as much as 300 times higher than in case of sucrose. Stevia is a plant with a very interesting, but up to this date not very utilised potential. The fields of its application, processing, cultivation and wintering options have not been explored very extensively, and therefore I have decided to elaborate this topic related to the impact of the environmental conditions for growing of Stevia rebaudiana. The resources for the text of the diploma thesis were formed by available specialised publications and the Internet. The first part of the thesis represents a brief overview of the whole issue concerning the topic of Stevia rebaudiana. The objectives, hypotheses and methodology of the conducted research, including the findings based on the plant growing as well, and the evaluation of the experiment results have been included in the second part. The purpose of the thesis was to expand the knowledge regarding cultivation, reproduction methods and wintering options of the stevia plants. A field and a greenhouse experiments were staged with a focus on temperature indicators during the growing season and their impact on the total number of wintered plants. Simultaneously, an evaluation of the dry matter yield of the plants per an area unit and statistical processing and evaluation of the experiment results have been performed. Further, a determination of seed germination for Stevia rebaudiana in laboratory conditions has been conducted. The research results have shown that the plants obtained vegetatively are more suitable for cultivation due to a higher yield of the dry matter in both greenhouse as well as field conditions. The only pests invading stevia were the whiteflies appearing only in the greenhouse environment. Variable conditions were arranged for the wintering of the Stevia rebaudiana plants within the experiment; and in spite of the various materials and thermal insulation layers, the plants have not successfully wintered in an unheated environment. On the contrary, in the heated greenhouse space, most of the plants have successfully wintered. The stevia seed germination was low and proves the opinion of the majority of authors. The dry matter yields also matched the yields mentioned in the specialised literature.
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European legislation of novel food
Šálková, Lucie ; Grmelová, Nicole (advisor) ; Vavrečka, Jan (referee)
The thesis deals with legal aspects of novel food in EU, it brings also American point of view. Theoretical part of the paper is focused on the comparisn of the old legislation of novel food with new one, which will be applicable until 2018. Another point in the theoretical part is charasteristics of EFSA and FDA institutions. In the practical part specific examples of novel food and their characteristics are defined there. Last point of the practical part is based on judicature.
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Stevioside and rebaudioside use in the food industry in the Czech Republic and the European Union
PRAYER, Radek
The main objective of this work was a search process can use steviolglycosides in foodstuffs within the Czech Republic and the European Union in the period since 2000, focusing on legislation and non-food use. Based on journal articles and available legislative provisions, it is clear that Stevia is a plant with great potential to replace at least part of the current sweeteners. Stevia can also be used in cosmetics or in medicine because it contains substances that are beneficial to health. Legislation currently in force in the European Union and the Czech Republic permitted in food use steviolglycosides in high purity. Using Stevia plants or parts thereof, as food is not allowed.
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Novel foods
MIKLOŠOVÁ, Katarína
The contents of the Bachelor's thesis is the performance of novel foods. Since it is relatively new and not much known area of the food industry, is available to only a limited amount of information. The work shows how it looks on the Czech market legislation, approval, placing into circulation and food safety. It is also possible to read at work how consumers and retailers perceive novel foods. What range of novel foods is in our market? A new type of food is also genetically modified organisms, that work also deals with.
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Substitution of beet sugar with plant Stevia rebaudiana and its effect on the sensory quality of selected products.
PEŠTA, Antonín
The main objective of this thesis was to substitute beet sugar with Stevia Rebaudiana Bertoni plant extract, and to assess effect of this substitution on sensory quality of selected products. Ten different samples of cherry jam were produced, using different combination of sweeteners in each of them. As sweeteners, beet sugar and Stevia leaf extract was used. This stevia leaf extract is even 400 times sweeter than common sugar. All samples of jam underwent sensory analysis and results have been graphically processed. The results has shown that Stevia has certain effect on sensory quality.
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