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Vrednotenje polifenolnih antioksidantov z metodo antioksidativne kapacitete redukcije bakrovih(II) ionov = Evaluation of polyphenol antioxidants by using the cupric reducing antioxidant capacity method : magistrski študijski program Industrijska farmacijaMikić, DanielaV današnjem času smo zaradi hitrega načina življenja izpostavljeni stresu, ki se ga začnemo zavedati šele ob izbruhu določenih bolezni. Stres, ki ga povzročajo reaktivne kisikove in dušikove zvrsti, ... imenujemo oksidativni stres. Reaktivne zvrsti so zelo nevarne in škodljive, kadar nastajajo prekomerno v organizmu, saj lahko poškodujejo deoksiribonukleinsko kislino, lipide in proteine. Nevarnost poškodb bioloških molekul lahko preprečimo z vnosom antioksidantov, ki zamejijo oksidativne poškodbe biomolekul. Številni antioksidanti so prisotni v sadju in zelenjavi, zato z uživanjem le-teh lahko pripomoremo k boljši antioksidativni obrambi. V magistrski nalogi smo ovrednotili antioksidativno kapaciteto izbranim kinazolinonom z metodo antioksidativne kapacitete redukcije bakrovih(II) ionov (CUPRAC). Metoda temelji na redukciji bakrovega(II) iona v bakrov(I) ion s spojino, ki jo vrednotimo. Pri redukciji se modra barva kompleksa bakrovega(II) iona z neokuproinom spremeni v oranžno-rumeno barvo. Kot standard smo uporabili vodotopni analog α-tokoferola Trolox®. Ugotovili smo, da nekatere testirane spojine izkazujejo boljšo antioksidativno kapaciteto od Troloxa (5 spojin), spet druge pa slabšo (spojine 8, 9, 10) oziroma sploh ne izkazujejo antioksidativnih lastnosti (spojina 1). Za vrednotenje rezultatov smo iz molarnega absorpcijskega koeficienta (ε) spojine in molarnega absorpcijskega koeficienta (ε) standarda (Trolox) izračunali razmerje antioksidativne kapaciteta ekvivalentne Troloxu TEACCUPRAC. Ugotovili smo, da na antioksidativno kapaciteto kinazolinonov vpliva položaj in število fenolnih -OH skupin. Več kot je hidroksilnih skupin vezanih na aromatski obroč, večja je antioksidativna kapaciteta, boljši je antioksidant. Prav tako smo ugotovili, da prisotnost metoksi skupine v odvisnosti od položaja glede na hidroksilno skupino bistveno poveča antioksidativno kapaciteto. Zamenjava metoksi skupine z etoksi skupino pa ni bistveno vplivala na povečanje antioksidativne kapacitete.Type of material - master's thesis ; adult, seriousPublication and manufacture - Ljubljana : [D. Mikić], 2022Language - slovenianCOBISS.SI-ID - 133963779
Author
Mikić, Daniela
Other authors
Mravljak, Janez, 1978-
Topics
Antioksidanti |
Oksidativni stres |
Radikali |
CUPRAC |
kinazolinoni |
cupric reducing antioxidant capacity |
radicals |
oxidative stress |
antioxidants |
quinazolinones
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Library/institution |
City | Acronym | For loan | Other holdings |
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Faculty of Pharmacy, Ljubljana | Ljubljana | FFALJ |
reading room 1 cop.
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Mikić, Daniela | ![]() |
Mravljak, Janez, 1978- | 23419 |
Source: Personal bibliographies
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