diplomsko delo
Leja Šenica (Author), Tatjana Zupančič (Mentor)

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.

Keywords

analizna kemija;kofein;analizne metode;kromatografske metode;tekočinska kromatografija visoke ločljivosti;HPLC;prehranska dopolnila;topli napitki;diplomske naloge;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL FKKT - Faculty of Chemistry and Chemical Technology
Publisher: [L. Šenica]
UDC: 543.544.5.068.7(043.2)
COBISS: 1538312387 Link will open in a new window
Views: 873
Downloads: 720
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Other data

Secondary language: English
Secondary title: Determination of caffeine in dietary supplements
Secondary 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.
Secondary keywords: HPLC;caffeine;dietary supplements;hot beverages;
Type (COBISS): Bachelor thesis/paper
Study programme: 1000374
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. v Ljubljani, Fak. za kemijo in kemijsko tehnologijo, VSŠ Kemijska tehnologija
Pages: 26 str.
ID: 11215358