diplomsko delo
Teja Bele (Author), Anton Meden (Mentor)

Abstract

Prehranska dopolnila so danes močno razširjena na trgu. Veliko ljudi posega po njih, zato sem se odločila preveriti njihovo fazno sestavo in jo primerjati z deklaracijo posameznega izdelka. To mi je omogočila rentgenska praškovna difrakcija, pri kateri obsevamo vzorce z rentgensko svetlobo specifične valovne dolžine. Vzorec mora vsebovati kristalinične snovi, saj metoda temelji na periodično urejeni strukturi kristalov. Analizirala sem 21 vzorcev prehranskih dopolnil. Za določitev fazne sestave sem si pomagala z dvema programoma, X΄ pert HighScore Plus in Crystallographica Search-Match (CSM). S pomočjo programa X΄ pert HighScore Plus sem prikazala difraktograme posnetih vzorca ter jih med seboj primerjala glede na skupne lastnosti vzorca. Vzorce sem umestila v šest skupin: glede na vsebnost magnezija, kalcija, železa, cinka, selena ter vzorce, ki se nahajajo v obliki šumeče tablete. CSM-program pa mi je omogočil primerjavo difgraktograma posameznega standarda spojine z difraktogramom vzorca. S kvalitativno analizo sem ugotovila, da sem pri večini vzorcev lahko potrdila faze, navedene v deklaraciji izdelka. V zbirki PDF nisem našla magnezijevega citrata, zato ga ni bilo mogoče identificirati. Selena v vzorcih nisem uspela identificirati, saj se ta nahaja pod mejo zaznave. Med difraktogrami posnetih vzorcev najdemo tudi tipični difraktogram amorfne snovi.

Keywords

kvalitativna fazna analiza;rentgenska praškovna difrakcija;difraktogrami;priprava vzorcev;prehranska dopolnila;minerali;vitamini;diplomske naloge;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL FKKT - Faculty of Chemistry and Chemical Technology
Publisher: [T. Bele]
UDC: 543.442.3(043.2)
COBISS: 27584259 Link will open in a new window
Views: 748
Downloads: 323
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Other data

Secondary language: English
Secondary title: X-ray powder diffraction of dietary supplements
Secondary abstract: Nowadays dietary supplements are widespread on the market. As they are used by many people, I decided to investigate their phase composition and compare my findings with the product's declaration. I preformed X-ray powder diffraction, which involves irradiating the samples with X-rays of a specific wavelength. The analysed sample must contain crystalline matter, as the method relies on the periodic arrangement of atoms in crystals. I analysed 21 samples of dietary supplements. To determine the phase composition, I used two software packages, X΄ pert HighScore Plus and Crystallographica Search-Match (CSM). I used X΄ pert HighScore Plus to display the recorded diffractograms and compare them based on common traits of the sample. I sorted the samples into 6 groups: based on magnesium, calcium, iron, zinc and selenium content, and samples in the form of an effervescent tablet. The CMS software package allowed me to compare the difractogram of a standard solution with the diffractogram of the sample. Using qualitative analysis, I was able to confirm that the phase composition of most samples matches the information in the product’s declaration. I wasn't able to identify magnesium citrate, as it wasn't present in the PDF collection. I also wasn't able to identify selenium in the samples, as its quantity was too low to detect. The typical diffractogram of an amorphous substance can also be found amongst the recorded diffractograms.
Secondary keywords: X-ray powder diffraction;qualitative phase analysis;nutritional supplements;minerals;vitamins;
Type (COBISS): Bachelor thesis/paper
Study programme: 1000374
Thesis comment: Univ. v Ljubljani, Fak. za kemijo in kemijsko tehnologijo, VSŠ Kemijska tehnologija
Pages: 64 str.
ID: 12023817