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Fast methods for analysis of migrants from food-contact materials
Vavrouš, Adam ; Čabala, Radomír (advisor) ; Jelínek, Ivan (referee) ; Bajerová, Petra (referee)
(AJ) Food contact materials pose a risk to human health due to a variety of contaminants which they can release into food. These compounds, migrants, include aromatic hydrocarbons, dialkyl phthalates, bisphenols, printing ink photoinitiators, and perfluoroalkyl compounds. The determination of all these substances can be expensive and time-consuming since universally applicable analytical approaches are not available nowadays. This work attempted to develop methods for the simultaneous determination of migrants from all of the mentioned groups in paper-based food contact materials and fatty food. A total of 68 contaminants were studied in paper products using liquid chromatography and gas chromatography coupled with tandem mass spectrometry detection. All analytes were isolated simultaneously using the modified "QuEChERS" method. This method demonstrated acceptable recovery and repeatability for most analytes in the validation study; LOQs ranged from 1.3 to 220 µg/kg. Analysis of 132 real paper products confirmed the occurrence of almost all studied analytes, which were often present in complex mixtures and at concentrations up to 628 mg/kg. A total of 41 potential contaminants were monitored in fatty foods by liquid chromatography with tandem mass detection. Contamination of the mobile phase by...
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Fast methods for analysis of migrants from food-contact materials
Vavrouš, Adam ; Čabala, Radomír (advisor) ; Jelínek, Ivan (referee) ; Bajerová, Petra (referee)
(AJ) Food contact materials pose a risk to human health due to a variety of contaminants which they can release into food. These compounds, migrants, include aromatic hydrocarbons, dialkyl phthalates, bisphenols, printing ink photoinitiators, and perfluoroalkyl compounds. The determination of all these substances can be expensive and time-consuming since universally applicable analytical approaches are not available nowadays. This work attempted to develop methods for the simultaneous determination of migrants from all of the mentioned groups in paper-based food contact materials and fatty food. A total of 68 contaminants were studied in paper products using liquid chromatography and gas chromatography coupled with tandem mass spectrometry detection. All analytes were isolated simultaneously using the modified "QuEChERS" method. This method demonstrated acceptable recovery and repeatability for most analytes in the validation study; LOQs ranged from 1.3 to 220 µg/kg. Analysis of 132 real paper products confirmed the occurrence of almost all studied analytes, which were often present in complex mixtures and at concentrations up to 628 mg/kg. A total of 41 potential contaminants were monitored in fatty foods by liquid chromatography with tandem mass detection. Contamination of the mobile phase by...
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Foreigners in the CR
Ageeva, Daria ; Grosz, Jan (advisor) ; Macháček, Otakar (referee)
The aim of this work is with the help of statistical methods to analyse data relating to foreigners in the Czech Republic. The main group for the study are representatives of the former Soviet Union. The work reflects the changes having taken place in the structure of foreigners in recent years, and also makes attempts to propose possible changes in the number of national and other indicators in the nearest future.
The theoretical part presents the basic terms related to this work such as migration, immigrant and others, it is followed by the classification of migration from different perspectives. In this part of the work attention is also paid to the history of world migration, its modern trends and tendencies, positive and negative aspects of the impact of migration as it is important to consider the issue in a broader context.
The practical part consists of the analysis of the data acquired and processed by the author, which deduce trends of indicators and their changes. At the end of this part, there are given the results of questioning about the migrants living in the Czech Republic, their position in the society and the problems associated with their residence in the Czech republic.
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