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The selection and optimization of the method for assessment of free fatty acids
Koval, Dominik ; Vespalcová, Milena (referee) ; Vítová, Eva (advisor)
This master´s thesis deals with optimization and validation of method for determination of free fatty acids. The theoretical part is focused on possibilities of extraction, extract separation, esterification, gas chromatography determination and brief description of the most important validation parameters. All with main emphasis on applying on free fatty acids. The experimental part describes the selection and procedure of optimizing individual steps of the method. Extraction of lipids was performed by solvent mixture (diethylether/petroleumether), based on the standard ČSN EN ISO 1735, for the extraction of free fatty acid solid phase extraction was tested. The acid catalyzed esterification based on ČSN EN ISO 5509 using methanolic solution BF3 was used for derivatization of free fatty acids and a gas chromatograph with a flame ionization detector was used for their determination. Subsequently, selected validation parameters of the method were verified: repeatability, reproducibility, linearity, limits of detection and quantitation. Sunflower oil and emmental type cheese, bought in common food market, were used as model samples for selection and optimatization of the method.
The assessment of chosen characteristics of cheese fats
Koval, Dominik ; Hrstka, Miroslav (referee) ; Vítová, Eva (advisor)
This bachelor’s thesis deals with assessment of selected fat characteristics of natural edam cheese. The theoretical part deals with general characteristics of natural cheese and structure of individual components. The main objective was to introduce and optimize methods in a laboratory to simple analysis of fat in cheese. Fat numbers were determined. To optimize were used samples, which were purchased at regular food store. With optimized methods were analyzed samples of cheese produced in cooperation with the Institute of Food Technology of Tomas Bata University in Zlin.

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7 Koval, Dušan
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