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Rapid estimation of tocopherol content in linseed and sunflower oils-reactivity and assay
Prevc, Tjaša (Avtor), Levart, Alenka (Avtor), Kralj Cigić, Irena (Avtor), Salobir, Janez (Avtor), Poklar Ulrih, Nataša (Avtor), Cigić, Blaž (Avtor)

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Izvleček
The reactivity of tocopherols with 2,2-diphenyl-1-picrylhydrazyl (DPPH) was studied in model systems in order to establish a method for quantifying vitamin E in plant oils. The method was optimized with respect to solvent composition of the assay medium, which has a large influence on the course of reaction of tocopherols with DPPH. The rate of reaction of α-tocopherol with DPPH is higher than that of γ-tocopherol in both protic and aprotic solvents. In ethyl acetate, routinely applied for the analysis of antioxidant potential (AOP) of plant oils, reactions of tocopherols with DPPH are slower and concentration of tocopherols in the assay has a large influence on their molar reactivity. In 2-propanol, however, two electrons are exchanged for both α- and γ-tocopherols, independent of their concentration. 2-propanol is not toxic and is fully compatible with polypropylene labware. The chromatographically determined content of tocopherols and their molar reactivity in the DPPH assay reveal that only tocopherols contribute to the AOP of sunflower oil, whereas the contribution of tocopherols to the AOP of linseed oil is 75%. The DPPH assay in 2-propanol can be applied for rapid and cheap estimation of vitamin E content in plant oils where tocopherols are major antioxidants.

Jezik:Angleški jezik
Ključne besede:plant oil, α-tocopherol, γ-tocopherol, vitamin E, DPPH, antioxidants, solvent
Vrsta gradiva:Članek v reviji (dk_c)
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:BF - Biotehniška fakulteta
FKKT - Fakulteta za kemijo in kemijsko tehnologijo
Leto izida:2015
Št. strani:Str. 14777-14790
Številčenje:Vol. 20, iss. 8
UDK:664.3:577.161.3:544.4
ISSN pri članku:1420-3049
DOI:10.3390/molecules200814777 Povezava se odpre v novem oknu
COBISS.SI-ID:4555896 Povezava se odpre v novem oknu
Število ogledov:806
Število prenosov:338
Metapodatki:XML RDF-CHPDL DC-XML DC-RDF
 
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Gradivo je del revije

Naslov:Molecules
Skrajšan naslov:Molecules
Založnik:MDPI
ISSN:1420-3049
COBISS.SI-ID:18462981 Povezava se odpre v novem oknu

Licence

Licenca:CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
Povezava:http://creativecommons.org/licenses/by/4.0/deed.sl
Opis:To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.
Začetek licenciranja:13.08.2015

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede:rastlinska olja, sončnično olje, laneno olje, antioksidanti, tokoferol, vitamin E, antioksidativni potencial, kemijska kinetika

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