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Določanje kofeina v prehranskih dopolnilih
ID Šenica, Leja (Author), ID Zupančič, Tatjana (Mentor) More about this mentor... This link opens in a new window

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Abstract
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.

Language:Slovenian
Keywords:HPLC, kofein, prehranska dopolnila, topli napitki
Work type:Bachelor thesis/paper
Typology:2.11 - Undergraduate Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Technology
Year:2019
PID:20.500.12556/RUL-109507 This link opens in a new window
COBISS.SI-ID:1538312387 This link opens in a new window
Publication date in RUL:04.09.2019
Views:1999
Downloads:800
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Secondary language

Language:English
Title:Determination of caffeine in dietary supplements
Abstract:
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.

Keywords:HPLC, caffeine, dietary supplements, hot beverages

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