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master's thesis
Određivanje sadržaja vitamina E u hrani za nesilice
2021. urn:nbn:hr:182:078569
Dončić, Renata
Josip Juraj Strossmayer University of Osijek
Department of Chemistry
Department of Analytical, Organic and Applied Chemistry

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Dončić, R. (2021). Određivanje sadržaja vitamina E u hrani za nesilice (Master's thesis). Osijek: Josip Juraj Strossmayer University of Osijek, Department of Chemistry. Retrieved from https://urn.nsk.hr/urn:nbn:hr:182:078569

Dončić, Renata. "Određivanje sadržaja vitamina E u hrani za nesilice." Master's thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, 2021. https://urn.nsk.hr/urn:nbn:hr:182:078569

Dončić, Renata. "Određivanje sadržaja vitamina E u hrani za nesilice." Master's thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, 2021. https://urn.nsk.hr/urn:nbn:hr:182:078569

Dončić, R. (2021). 'Određivanje sadržaja vitamina E u hrani za nesilice', Master's thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, accessed 16 November 2024, https://urn.nsk.hr/urn:nbn:hr:182:078569

Dončić R. Određivanje sadržaja vitamina E u hrani za nesilice [Master's thesis]. Osijek: Josip Juraj Strossmayer University of Osijek, Department of Chemistry; 2021 [cited 2024 November 16] Available at: https://urn.nsk.hr/urn:nbn:hr:182:078569

R. Dončić, "Određivanje sadržaja vitamina E u hrani za nesilice", Master's thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, Osijek, 2021. Available at: https://urn.nsk.hr/urn:nbn:hr:182:078569

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Metadata
TitleOdređivanje sadržaja vitamina E u hrani za nesilice
Title (english)Determination of vitamin E content in laying hens feed
AuthorRenata Dončić
MentorOlivera Galović (mentor)
Committee memberAna Amić (predsjednik povjerenstva)
Committee memberOlivera Galović (član povjerenstva)
Committee memberMartina Medvidović-Kosanović (član povjerenstva)
GranterJosip Juraj Strossmayer University of Osijek
Department of Chemistry
(Department of Analytical, Organic and Applied Chemistry)
Osijek
Defense date and country2021-10-04, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Chemistry
Analytic Chemistry
Abstract
Vitamin E je organska tvar topiva u mastima. Vrlo je važan za zdravlje ljudi, a budući da ga ljudsko tijelo ne može samostalno proizvoditi, potrebno ga je unositi hranom ili dodacima prehrani. Također je važan dodatak prehrani u hrani za kokoši nesilice zbog održavanja fizioloških funkcija i proizvodnje jaja te se na taj način povećava unos vitamina E i u ljudsko tijelo. Cilj istraživanja bio je utvrditi sadržaj vitamina E u hrani za kokoši nesilice i hrani za kokoši obogaćenu vitaminom E i raznim uljima. Korištene su tri različite metode: izravna ekstrakcija metanolom, izravna ekstrakcija ultrazvukom i ekstrakcija s prethodnom saponifikacijom. Nakon ekstrakcije uzorci su analizirani pomoću tekućinske kromatografije visoke djelotvornosti. Koncentracija vitamina E određena je u uzorcima hrane za kokoši dostupne na tržištu, u uzorcima s dodanim uljima, s dodatkom drugih nutricina (selena i luteina) i u hrani s dodatkom vitamina E i drugih nutricina. Najveća koncentracija vitamina E pronađena je u uzorcima s dodatkom vitamina E i drugih nutricina (725,940 mg/kg hrane), a najniža koncentracija vitamina E u uzorcima s dodatkom drugih nuticina (selen) 193,242 mg /kg hrane.
Abstract (english)
Vitamin E is an organic substance soluble in fats. It is very important for human health and since the human body cannot produce it on its own, it is necessary to intake it through food or dietary supplements. It is also an important food supplement in laying hens feed due to the maintenance of physiological functions and egg production and in this way the intake of vitamin E in the human body increases. The aim of the study was to determine the content of vitamin E in laying hens feed and hens feed enriched with vitamin E and various oils. Three different methods were used: direct extraction with methanol, direct ultrasound extraction and extraction with prior saponification. After extraction, samples were analyzed by means of high-performance liquid chromatography. Concentration of vitamin E was determined in samples of hens feed available on the market, samples with added oils, with the addition of other nutricines (selenium and lutein) and food with the addition of vitamin E and other nutricines. The highest concentration of vitamin E was found in samples with the addition of vitamin E and other nutricines (725.940 mg/kg of hens feed) and the lowest concentration of vitamin E was found in samples with the addition of other nutricines (selenium) 193.242 mg/kg of hens feed.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:182:078569
Study programmeTitle: Graduate University Study of Chemistry; research program; specializations in: Research program
Course: Research program
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra kemije (magistar/magistra kemije)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2022-08-04 08:54:13