magistrsko delo
Tajda Kuret (Author), Mitja Kolar (Mentor), Iztok Turel (Thesis defence commission member), Drago Kočar (Thesis defence commission member), Manja Kurečič (Co-mentor)

Abstract

Namen dela je bilo določiti rastlinsko olje z največjo vsebnostjo linolne kisline s plinsko kromatografijo (GC). Analizirali smo enajst vzorcev rastlinskih olj in en vzorec živalske maščobe. Kot detektor smo uporabili masni spektrometer (MS), ki ponuja visoko selektivnost in občutljivost. GC-MS pogoje smo optimizirali tako, da smo dobili dobro ločene spektre posameznih estrov maščobnih kislin. Analizno metodo smo delno validirali in potrdili ustrezno linearnost, natančnost, točnost in ponovljivost. Sončnično olje je imelo tretjo najvišjo vsebnost linolne kisline, a se je zaradi svoje dostopnosti, cenovne ugodnosti in drugih fizikalnih lastnosti, izkazalo za najbolj primerno rastlinsko olje za emulzijsko elektropredenje nanovlaken. Elektropredene tkanine iz nanovlaken z visokim razmerjem med površino in prostornino so bile namreč v zadnjih letih večkrat predmet preučevanja, kot mogoča rešitev za podaljšanje roka uporabnosti sadja in zelenjave. Emulzijski sistemi za elektropredenje nanovlaken vsebujejo oljno in vodno fazo v kateri je linolna kislina biološki prekurzor biosinteze heksanala, ki zaradi protimikrobnega delovanja zavira zorenje sadja in zelenjave.

Keywords

maščobe;lipidi;plinska kromatografija;GC-MS;hranilna vrednost;magistrska dela;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL FKKT - Faculty of Chemistry and Chemical Technology
Publisher: [T. Kuret]
UDC: 543.544.3:543.51:664.34(043.2)
COBISS: 228274947 Link will open in a new window
Views: 63
Downloads: 4
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Other data

Secondary language: English
Secondary title: Fatty acid profile of vegetable oils
Secondary abstract: The aim of the work was to determine the vegetable oil with the highest linoleic acid content by gas chromatography (GC). Eleven vegetable oil samples and one animal fat sample were analyzed. A mass spectrometer (MS) was used as the detector, which offers high selectivity and sensitivity. The GC-MS conditions were optimized to obtain well-separated spectra of individual fatty acid esters. The analytical method was partially validated and confirmed to have adequate linearity, precision, accuracy and repeatibility. Sunflower oil had the third highest linoleic acid content, but due to its accessibilizy, affordability and other physical properties, it proved to be the most suitable vegetable oil for emulsion electrospinning of nanofibers. Electrospun nanofiber fabrics with a high surface area to volume ratio have been studied several times in recent years as a possible solution for extending the shelf life of fruit and vegetables. Emulsion system for electrospinning nanofibers contain an oil and water phase in which linoleic acid is a biological precusros for the biosynthesis of hexanal, which inhibits the ripening of fruits and vegetables due to its antimicrobial activity.
Secondary keywords: vegetable oils;gas chromatography;mass spectrometry;fatty acids;Maščobne kisline;Rastlinska olja;Kromatografija;Masna spektrometrija;Univerzitetna in visokošolska dela;
Type (COBISS): Master's thesis/paper
Study programme: 1000375
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. v Ljubljani, Fak. za kemijo in kemijsko tehnologijo, smer Kemija
Pages: 1 spletni vir (1 datoteka PDF (53 str.))
ID: 25968246