20.500.12556/DKUM-21815 VPLIV TEMPERATURE IN ČAS EKSTRAKCIJE NA VSEBNOST ANTIOKSIDATIVNIH UČINKOVIN IZ IGLAVCEV INFLUENCE OF TEMPERATURE AND EXTRACTION TIME ON THE CONCENTRATION OF ANTIOXIDANTS FROM CONIFERS Lubje iglavcev vsebuje poleg hidrofilnih polifenolov še lipofilne smole in eterična olja ter netopne snovi, kot so celuloza in lignin. Ker smo dežela bogata z iglastimi gozdovi nas je zanimalo, če so ekstrakti naših iglavcev primerljivi s Piknogenolom, za katerega se ve, da je iz obmorskega bora. Piknogenol je sestavljen iz 50 učinkovin, ki delujejo antioksidacijsko. Glavne fenolne spojine v skorji bora so proantocianidini, flavonoidi so prisotni v manjši količini. Piknogenol blagodejno učinkuje na krvožilni sistem, zato ga še posebno priporočajo diabetikom. Blaži tudi težave z vidom, ki nastanejo zaradi retinopatij, in pospeši regeneracijo manjših površinskih poškodb kože. Tako smo ekstrahirali tri različna lubja iglavcev, zaradi poslovne skrivnosti podjetja so označeni kot vzorec A, B in C. V vzorcih smo določevali vsebnost skupnih fenolov, skupnih flavonoidov, proantocianidinov in antioksidacijsko aktivnost. Najvišjo vsebnost skupnih fenolov, skupnih flavonoidov, proantocianidinov in antioksidacijko aktivnost smo določili v vzorcu A in C. Rezultati kažejo, da smo pri vzorcu A in C dobili največji izkoristek ter vsebnost skupnih fenolov in flavonoidov v ekstrakcijah pri 100°C. Najvišjo vsebnost proantocianidinov in antioksidativno aktivnost pa smo določili v ekstraktih dobljenih pri temperaturi 80°C. Conifer bark contains hydrophilic polyphones, lypophilic resins, essential oil and insoluble substances, such as cellulose and lignin. According to the fact that our country is rich with coniferous forests we were interested in comparing extracts from conifers to pycnogenol, which is made from sea boron. Pycnogenol consists of 50 substances, which have an effect of antioxidant activity. Main phenol compounds in boron bark are proantocianidins, flavonoids are present in a smaller amount. Pycnogenol affects beneficently on circulatory system that is why it is especially recommended to diabetics. It also has positive effects in case of sight problems, that are the consequences of retinopathies, and stimulates the regeneration of smaller skin wounds. Three different conifer barks were extracted. The samples were marked as A, B and C. In samples content of total phenols, total flavonoids, proantocianidins and antioxidant activity were determined. The highest concentration of total phenols, total flavonoids, proantocianidins and antioxidant activity were determined samples A and C. The results show that in the samples A and C were extracted the highest content of dry substance, content of common phenols, flavonoids at 100°C. The highest content of proantocianidins and antioxidant activity were determinated for extracts obtained at 80°C. Ekstrakcija lubje iglavcev fenolne spojine flavonoidi proantocianidini antioksidativna aktivnost. Extraction bark of conifers phenolic compounds flavonoids proantocianidins antioxidant activity true true false [N. Kugler] Slovenski jezik Angleški jezik Diplomsko delo 2012-01-05 00:40:50 2012-01-05 11:35:21 2022-04-14 10:55:10 2023-12-29 03:15:28 2011 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 66.061-987(043.2) 16039446 URN:SI:UM:DK:CIXYFN7B VS_Kugler_Nusa_2012.pdf VS_Kugler_Nusa_2012.pdf 1 8ADC1D85D94909A84043D84E26F4F3D5 d6f450d4b4f6d2fb788ac512ce15a53b5b520ee7350da986467bcd6edbafa4ce f26cf399-7c05-11eb-bb7a-00155d0001ca 20.500.12556/dkum/522e3de5-c22d-47e6-8459-5f74c6ba2c5a https://dk.um.si/Dokument.php?lang=slv&id=27822 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0