20.500.12556/RUL-109507 Določanje kofeina v prehranskih dopolnilih Determination of caffeine in dietary supplements Na trgu je na voljo veliko število prehranskih dopolnil in napitkov, ki vsebujejo kofein. Kofein je naravni alkaloid, ki ga najdemo v listih, plodovih in semenih mnogih rastlin. Ljudje ga radi uživajo zaradi njegovega poživljajočega učinka, ki zmanjšuje utrujenost in zaspanost. V diplomskem delu sem določala vsebnost kofeina v prehranskih dopolnilih in različnih pijačah oziroma kavah in čaju. Za določanje kofeina sem uporabila reverzno-fazno tekočinsko kromatografijo visoke ločljivosti z UV detektorjem. Tekom eksperimentalnega dela sem preverila tudi ponovljivost kromatografske metode. Prišla sem do zaključka, da največ kofeina vsebuje prehransko dopolnilo Guarana natural energy, najmanj pa zeleni čaj. A large number of dietary supplements and beverages containing caffeine are available on the market. Caffeine is a natural alkaloid found in leaves, fruits and seeds of many plants. People like to drink caffeine because of its stimulating effect, which reduces exhaustion and sleepiness. In this diploma thesis I aimed to determine the caffeine content in various dietary supplements and drinks (coffee and tea). A reversed-phase high performance liquid chromatography with UV detector was used for determination of caffeine. I also checked repeatability of the chromatographic method. I came to conclusion that Guarana natural energy supplement contains the most caffeine, while green tea turned out to be the least caffeinated. HPLC kofein prehranska dopolnila topli napitki HPLC caffeine dietary supplements hot beverages true false false Slovenski jezik Angleški jezik Diplomsko delo/naloga 2019-09-04 12:45:06 2019-09-04 12:45:09 2022-08-21 03:42:36 0000-00-00 00:00:00 2019 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 6322 1538312387 Senica_Leja_-_Dolocanje_kofeina_v_prehranskih_dopolnilih.pdf Senica_Leja_-_Dolocanje_kofeina_v_prehranskih_dopolnilih.pdf 1 5CF9377D0FAE9A9405B6F21B436670DA 347b087df265d3e906c115bea9547a3f0ae7e4bc7d172bfccc2b8c1217c1f5c6 e292c787-a1b6-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=121086 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0