10th Symposium on the Flora of Southeastern Serbia and ...

More documents

Recommendations

Info

10 th <strong>Symposium</strong> on the Flora of Southeastern Serbia and Neighbouring regions,Vlasina 17 to 20 June 2010Antioxidant activity of Satureja kitaibelii Wierzb. ex Heuff.,LamiaceaeSavić, I. 1 , Banjac, Lj. 2 , J. Kukić-Marković, T 2 . Kundaković, S. 2 , Zlatković,G. 3 , Nikolić 1 , Savić, I. 11 Faculty of Technology Leskovac, University of Niš, Serbia2 Institut za Farmakognoziju, Farmaceutski fakultet, Vojvode Stepe 450,Beograd 11000, Srbija3 Actavis Trading Ltd., Đorđa Stanojevića 12, Novi Beograd 11070, Srbijaici_teh@yahoo.comThe aerial parts of Satureja kitaibelii were used in serbian traditionalmedicine as herbal remedy for respiratory, digestive and urinary tract diseases, aswell for inflammation of skin and mucous membranes. The plant material wascollected in July 2008 on mountain Rtanj (Serbia) and extracted with cyclohexaneand 70% methanol (V/V). DPPH radical scavenging activity and inhibitory effect ofMeOH extract on lipid peroxidation (LP) in liposomes of methanol extract weremeasured according to the modified methods described previously by Kundaković etal. (2006) and Kukić et al. (2006). Fifty percent of radical scavenging activity inDPPH test was obtained with 34,5 ± 2,1 μg/ml of methanol extract, while IC50 ofLP inhibition in liposomes was 204 ± 2,99 μg/ml.Komparacija stabilnosti flavonola i flavona prema dejstvuUV-zračenja: slučaj kvercetina, morina i rutinaZvezdanović, J. 1 , Marković, D. 1 , Radovanović, B. 21 Faculty of Technology Leskovac, University of Niš, Serbia2 Faculty of Science and Mathematics, Serbiadejan_markovic57@yahoo.comKomparacija stabilnosti flavonola i flavona prema dejstvu UV-zračenja:slučaj kvercetina, morina i rutina Jelena Zvezdanović1, Dejan Marković1, BlagaRadovanović2 1Tehnološki fakultet, Leskovac 2Prirodno-matematički fakultet, Niš,Odsek za hemiju Flavonoidi čine veliku klasu prirodnih polifenolnih jedinjenja malemolekulske mase i široko su rasprostranjeni u biljnom svetu. Najviše ih ima ulistovima, semenu, kori i cvetovima biljaka, a do sada je izolovano više od 4,000različitih flavonoida. Nađeno je da se ova jedinjenja u biološkim sistemima moguponašati kao antioksidansi, enzimski inhibitori, fotosenzibilizatori, prenosioci88
10 th <strong>Symposium</strong> on the Flora of Southeastern Serbia and Neighbouring regions,Vlasina 17 to 20 June 2010energije, respiratori u biosintezama, a imaju i antikancerogene osobine. Zaantioksidacionu aktivnost posebno je važna 3-OH grupa (C-prstena – Slika 1) ukombinaciji sa kateholnom strukturom B-prstena. Značaj ove pozicije (tamo gde jeima, kao što je to slučaj sa flavonolima čiji je prestavnik kvercetin) se izmeđuostalog može oceniti kompariranjem stabilnosti kvercetina i rutina (predstavnikaflavona koji nema 3-OH grupu) u odnosu na spolja indukovani stres, kao što jenpr.UV zračenje. Ali i različit položaj istih supstituenata na B-prstenu (meta- i ortopoložajOH-grupa, u slučaju morina i kvercetina, respektivno) može uticati nastabilnost flavonoida. Odgovor biljaka na povećano prisustvo visoko-energetičneUV-B frakcije u spektru sunčevog zračenja jeste između ostalog i povećana sintezaUV-B apsorbujućih pigmenata, i to flavonoida pre svega (”screening” efekatflavonoida). Ovaj rad se bavi pitanjem stabilnost kvercetina, morina i i rutina nadejstvo zračenja iz tri UV-podopsega (UV-A, 320-400 nm; UV-B, 290-320 nm; UV-C, 200-280 nm) u rastvoru metanola. Pokazano je najpre da 3-OH grupa imapresudan uticaj na fotostabilnost flavonoida – jedinjenja koja imaju ovu grupu sumnogo manje otporna na zračenje UV-svetlošću: u ovom slučaju kvercetin podležebržoj destrukciji (bleaching-u) od rutina, pri čemu je bleaching energetski zavistan(opada po redosledu UV-C > UV-B > UV-A). Ali, takodje je pokazano da jedetektovani UV-efekat različit za dva flavonola (kvercetin i morin); morin podležebržoj destrukciji, a u njegovom apsorpcionom spektru detektovana je i potpuno novatraka što ukazuje na značajne pr omene u njegovoj strukturi.Essential Oil Composition of Stachys menthifolia Vis.Sanja Ćavar, Milka Maksimović, Marija Edita ŠolićDepartment of Chemistry, Faculty of Science, University of Sarajevosanja.cavar@pmf.unsa.baStachys menthifolia Vis. (Lamiaceae) is an endemic species from the BalkanPeninsula spread throughout Albania, Greece, Montenegro, and Croatia. Aerial partsof the plant were collected from its natural habitat near Dubrovnik. Hydrodistilledvolatile oil obtained from the plant material of S. menthifolia was subjected to gaschromatographic analysis coupled to mass spectrometry. More than 70 compoundswere identified, representing 94.5% of the total oil. The major constituents of oilwere diterpenoid abietatriene (11.7%), and sesquiterpene hydrocarbons alphabisabolene(8.4%), and beta-caryophyllene (7.4%). Presented results are comparableto our previous findings on essential oil composition of the same species fromBiokovo Mountain, with small differences in quantitative and qualitativeconstitution of oil. Although plants belonging to the Stachys genus show significantvariability in their chemical compositions depending on the location and stage of89
Page 1 and 2:
10 th Symposium on
Page 4 and 5:
10 th Symposium on
Page 6 and 7:
10 th Symposium on
Page 8 and 9:
10 th Symposium on
Page 10 and 11:
10 th Symposium on
Page 12 and 13:
10 th Symposium on
Page 14:
10 th Symposium on
Page 18 and 19:
10 th Symposium on
Page 20 and 21:
10 th Symposium on
Page 22 and 23:
10 th Symposium on
Page 25 and 26:
10 th Symposium on
Page 27 and 28:
10 th Symposium on
Page 29 and 30:
10 th Symposium on
Page 33 and 34:
10 th Symposium on
Page 35 and 36:
10 th Symposium on
Page 37 and 38:
10 th Symposium on
Page 39 and 40: 10 th Symposium on
Page 89: 10 th Symposium on
show all

10th Symposium on the Flora of Southeastern Serbia and ...

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?