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Comparison of vitamin C content between less known kinds of fruit
Mařáková, Veronika ; Hrstka, Miroslav (referee) ; Vespalcová, Milena (advisor)
This thesis deals with the determination of vitamin C in different varieties of cornelian cherry (Cornus mas) and mountain ash (Sorbus aucuparia). The theoretical part describes the botanical characteristics of both plants, the extension in the CZ and in the world, methods of reproduction, the content of meaningful health substances and the importance of both plants in food-processing industry. Attention is paid to vitamin C, which is in their fruits in high quantity. Conclusion of the theoretical part discusses various methods of determination of vitamin C. The aim of the experimental part was to comparison of the vitamin C content in different varieties cornelian cherry and mountain ash. The chosen method for the determination of vitamin C by high performance liquid chromatography (HPLC) with UV detection was first tested on standards. Selected validation parameters of this method was then determined. Validated method was used to determine the content of vitamin C in nine varieties cornelian cherry and six varieties of the mountain ash. For comparison were also tested some samples of the determination of total vitamin C after reducing dehydroascorbic acid by using dithiothreitol (DTT).
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Využití méně pěstovaných ovocných druhů pro zpracování
Vincentová, Martina
Bachelor thesis is focused on the possibility of growing and processing Chinese hawthorn (Crataegus pinnatifida Bunge.) and Chinese jujuba (Ziziphus jujuba Mill.). The origin, morphological description, cultivation, ecological requirements, propagation, harvest, health effects and food utilization of these fruit trees is described in this thesis. Japanese persimmon (Diospyros kaki Thunb.), Asian pear (Pyrus pyrifolia (Burm.) Nak. 'Hosui'), Hardy kiwi (Actinidia arguta (Siebold & Zuccarini) Planch. Ex Miq.), Sea buckthorn (Hippophae rhamnoides L.) and Mountain-ash (Sorbus aucuparia L. 'Sorbinka') are describe too. From the harvested fruits were produced conserves, marmelades and other products, which have been assessed during the tasting. Top rated was a jelly with hawthorn and hardy kiwi, then marmalade from jujuba, rowan berries and compote from jujuba and hawthorn with alcohol. Based on the evaluation was found that all products were evaluated above average. Products have positive sensoric qualities, significant health effects and are easy to produce. Therefore, the possibilities of domestic production are very wide.
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Využití méně pěstovaných ovocných druhů pro zpracování
Vincentová, Martina
Bachelor thesis is focused on the possibility of growing and processing Chinese hawthorn (Crataegus pinnatifida Bunge.) and Chinese jujuba (Ziziphus jujuba Mill.). The origin, morphological description, cultivation, ecological requirements, propagation, harvest, health effects and food utilization of these fruit trees is described in this thesis. Japanese persimmon (Diospyros kaki Thunb.), Asian pear (Pyrus pyrifolia (Burm.) Nak. 'Hosui'), Hardy kiwi (Actinidia arguta (Siebold & Zuccarini) Planch. Ex Miq.), Sea buckthorn (Hippophae rhamnoides L.) and Mountain-ash (Sorbus aucuparia L. 'Sorbinka') are describe too. From the harvested fruits were produced conserves, marmelades and other products, which have been assessed during the tasting. Top rated was a jelly with hawthorn and hardy kiwi, then marmalade from jujuba, rowan berries and compote from jujuba and hawthorn with alcohol. Based on the evaluation was found that all products were evaluated above average. Products have positive sensoric qualities, significant health effects and are easy to produce. Therefore, the possibilities of domestic production are very wide.
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|
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Comparison of vitamin C content between less known kinds of fruit
Mařáková, Veronika ; Hrstka, Miroslav (referee) ; Vespalcová, Milena (advisor)
This thesis deals with the determination of vitamin C in different varieties of cornelian cherry (Cornus mas) and mountain ash (Sorbus aucuparia). The theoretical part describes the botanical characteristics of both plants, the extension in the CZ and in the world, methods of reproduction, the content of meaningful health substances and the importance of both plants in food-processing industry. Attention is paid to vitamin C, which is in their fruits in high quantity. Conclusion of the theoretical part discusses various methods of determination of vitamin C. The aim of the experimental part was to comparison of the vitamin C content in different varieties cornelian cherry and mountain ash. The chosen method for the determination of vitamin C by high performance liquid chromatography (HPLC) with UV detection was first tested on standards. Selected validation parameters of this method was then determined. Validated method was used to determine the content of vitamin C in nine varieties cornelian cherry and six varieties of the mountain ash. For comparison were also tested some samples of the determination of total vitamin C after reducing dehydroascorbic acid by using dithiothreitol (DTT).
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