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Naslov:Phenols, proanthocyanidins, flavones and flavonols in some plant materials and their antioxidant activities
Avtorji:Škerget, Mojca (Avtor)
Kotnik, Petra (Avtor)
Hadolin Kolar, Majda (Avtor)
Rižner Hraš, Andreja (Avtor)
Simonič, Marjana (Avtor)
Knez, Željko (Avtor)
Datoteke:URL http://dx.doi.org/10.1016/j.foodchem.2004.02.025
 
Jezik:Angleški jezik
Vrsta gradiva:Neznano ()
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FKKT - Fakulteta za kemijo in kemijsko tehnologijo
Opis:Methanol extracts prepared from five plant materials native to the Mediterranean area, namely olive tree (Olea europaea) leaf, St. John's wort (Hypericum perforatum), hawthorn (Crataegus laevigata), oregano (Origanum vulgare) and laurel leaf (Lauris nobilis), were examined for their phenolic components. Total phenolic content was determined by the Folin-Ciocalteu method. The content of proanthocyanidins in acid-hydrolysed extracts was determined spectrophotometrically. The contents of free flavones (apigenin andluteolin) and flavonols (kaempferol, myricetin and quercetin) were determined by HPLC analysis. The time of hydrolysis of flavones, flavonols andproanthocyanidins was optimised. Antioxidant activities of apigenin, luteolin, kaempferol, myricetin, quercetin and of plant extracts were examined. Antioxidative activities were studied in sunflower oil at 98 °C, by measuring peroxide value, and in an aqueous emulsion system of -carotene and linoleic acid by measuring the absorbance of the sample. Among flavones and flavonols investigated, only myricetin inhibited oxidation of sunflower oil. All other flavones and flavonols showed pro-oxidative activity. Oppositely, in the emulsion system, only apigenin showed pro-oxidative activity while otherflavones and flavonols and plant extracts inhibited oxidation of -carotene.
Ključne besede:chemical processing, extraction, plant material, fenolic content, hidrolysis, antioxidants, flavones, flavonols, proanthocyanidines, oils, emulsions
Leto izida:2005
UDK:66.061:547.9:543.635
COBISS_ID:9016342 Novo okno
ISSN pri članku:0308-8146
NUK URN:URN:SI:UM:DK:UDCO1G0H
Število ogledov:1683
Število prenosov:90
Metapodatki:XML RDF-CHPDL DC-XML DC-RDF
Področja:Ostalo
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Gradivo je del revije

Naslov:Food chemistry
Skrajšan naslov:Food chem.
Založnik:Applied Science Publishers
ISSN:0308-8146
COBISS.SI-ID:6385415 Novo okno

Sekundarni jezik

Jezik:Angleški jezik
Ključne besede:kemijska procesna tehnika, ekstrakcija, rastlinski materiali, vsebnost fenolnih komponent, hidroliza, antioksidanti, flavoni, flavonoli, proantocianidini, olja, emulzije


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