The theoretical part of the thesis deals with the technology of fruit juices production and characteristics of the known varieties of elderberry. There are also summarized available information on the presence and properties of minerals in food. In the practical part of the thesis 17 different varieties of elderberry juice and commercially available juice sold as food supplements were analyzed using ICP-MS technique. The concentrations of 15 selected essential and toxic elements were determined in these juices.

An important part of the drinks are simple carbohydrates, because this thesis focuses on this issue. The theoretical part describes the characteristics , production , metabolism and the use of simple carbohydrates such as glucose, fructose and sucrose. There is also the definition of drinks and their main divisions . The literature review is based on the experimental part of analyzing selected beverages by high performance liquid chromatography with refractometric detection coupled to columns or alkyl ion-exchange phases. In conclusion, the results were compared to determine and comment . Nowadays the emphasis is on the correct functioning of the digestive tract. An important factor that supports the intestinal microflora is a prebiotic carbohydrate - tagatosa This could become tagatosa whose properties , production, metabolism in the body and any use is also included in the search . In the experimental part is listed possible optimization analysis of samples containing tagatosy on both types of columns in the HPLC system. The result is again commented in conclusion.

This work deals with the elemental analysis of different elderberry (Sambucus nigra L.) cultivars. In the theoretical part the botanical characteristics of elderberry, including its extension and places of occurrence, the possibilities of collecting the various parts of the elderberry and its use in food and cosmetics is described. A large part is devoted to the occurrence and characteristics of minerals in food, and to the methods that are suitable for elemental analysis and decomposition of biological material. The aim of the experimental part was to analyze different cultivars of elderberry and juice made from this cultivars, and to determine concentration of selected elements (Zn, Mn, Fe, Mg, Cu, P, Ca, Na and K) using ICP–OES. The total amount of 24 cultivars was analysed from which 6 varieties were harvested in two different seasons in 2011 and 2013. Measured concentrations of elements in different varieties of elderberry were mutually compared using statistical methods. The differences between the content of elements in fruits and juice, obtained by pressing the fruit, and the effect of seasonal conditions on the content of elements in the fruit juice from different elderberry cultivars were studied.