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National Repository of Grey Literature

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	Phloridzin content in selected apple varieties Křehlíková, Jana ; Mikulíková, Renata (referee) ; Diviš, Pavel (advisor) Phloridzin, a phenolic compound found in Malus genus, was targeted in this study for detection in apples and apple-based foods via HPLC. The research aimed to assess phlorizin’s potential as a marker for confirming apple presence in food, addressing food authenticity concerns. The methodology encompassed method optimization for sample preparation, considering solvent selection and oxygen impact on stability. Analysis revealed significant phloridzin distribution among apple varieties (Golden Delicious, Red Delicious, Granny Smith, Gala, Champion, Jonagold), averaging 17 ± 10 mgkg1. Further, 15 fruit products were surveyed for phloridzin content, with 5 non-apple-labelled foods also analysed. Phloridzin proved effective in detecting undeclared apple presence in jams, fillings, and fruit purees, highlighting potential for authenticity verification. However, fruit drinks and juices exhibited inconclusive results, suggesting a need for improved sample preparation and analysis methods. Detailed record
	Determination of the risk elements and other elements concentration in animal feed Křehlíková, Jana ; Juglová, Zuzana (referee) ; Diviš, Pavel (advisor) This thesis deals with the determination of selected microelements and macroelements and risk elements in dog and cat food. The theoretical part describes the nutrition of dogs and cats and focuses on the safety of the food in the context of contamination with risk elements. Another topic discussed is the chemical analysis of feeds, specifically the determination of nutritionally important substances, beneficial elements, and contaminants. The experimental part deals with the preparation and digestion of feed samples and the subsequent analysis of these samples using ICP-OES and AAS methods. The detected concentrations of the elements of interest in the feeds were compared with the feed standards issued by the Department of Veterinary Medicine and the decree issued by the Ministry of Agriculture. The analysed feeds were found to be deficient in some elements. The content of the risk elements in the feed met the legal limits and did not pose a health risk to the animal. Elements for which the legislation does not provide a maximum permissible limit were present in the feed-in in high concentrations that could already harm the animal's health. Detailed record
	Determination of the risk elements and other elements concentration in animal feed Křehlíková, Jana ; Juglová, Zuzana (referee) ; Diviš, Pavel (advisor) This thesis deals with the determination of selected microelements and macroelements and risk elements in dog and cat food. The theoretical part describes the nutrition of dogs and cats and focuses on the safety of the food in the context of contamination with risk elements. Another topic discussed is the chemical analysis of feeds, specifically the determination of nutritionally important substances, beneficial elements, and contaminants. The experimental part deals with the preparation and digestion of feed samples and the subsequent analysis of these samples using ICP-OES and AAS methods. The detected concentrations of the elements of interest in the feeds were compared with the feed standards issued by the Department of Veterinary Medicine and the decree issued by the Ministry of Agriculture. The analysed feeds were found to be deficient in some elements. The content of the risk elements in the feed met the legal limits and did not pose a health risk to the animal. Elements for which the legislation does not provide a maximum permissible limit were present in the feed-in in high concentrations that could already harm the animal's health. Detailed record

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