For centuries, aromatic herbs and spices have been added to different foods to improve the flavor and organoleptic properties. The use of aromatic plants and spices in phytotherapy is mostly related to different activities of their essential oils, such as antimicrobial, spasmolytic, carminative, hepatoprotective, antiviral, and anticarcinogenic activities. Furthermore, many studies point to strong antioxidant activities of aromatic plants and their essential oils. Knowing that phenolic compounds are the most responsible for the antioxidant activity, the amount of total phenolic contents and content of flavonoids have also been determined. In order to examine the antioxidant properties of five different extracts of Laurus nobilis L. leaves, various assays which measure free radical scavenging ability were carried out: 1,1-diphenyl-2-picrylhydrazyl, hydroxyl, superoxide anion, nitric oxide and hydroxyl radical scavenger capacity test, and lipid peroxidation assay. In all of the tests, only the EtOAc extract showed a potent antioxidant effect.
The antioxidant activity of Marrubium peregrinum essential oil, collected from three different locations [Backo Gradiste - Rimski Sanac (No.1), Novi Knezevac (No.2) and Senta (No.3)] was evaluated as free radical scavenging capacity (RSC), together with inhibition on xanthine-oxidase and effects on lipid peroxidation (LP). RSC was assessed measuring the scavenging activity of the essential oils on 2,2-diphenyl-1-picrylhydrazyl (DPPH•), super oxide anion (O2•−), nitric-oxide (NO•) and hydroxyl (OH•) radicals. The activities of xanthine-oxidase (XOD) was determined by the nitrite method. Effects on LP were evaluated by following the activities of essential oils in the Fe2+/ascorbate induction system. Experimental results indicate that the essential oil of M. peregrinum from Senta (No.3) exhibited the strongest inhibitory effect, as the IC50 value was achieved with the lowest concentration. The same result was obtained in investigation of influence of essential oil on XOD and LP. The chemical profile of essential oil was evaluated by the means of gas chromatography-mass spectrometry (GC-MS). According to the analysis, the most powerful scavenging compounds were sesquiterpene hydrocarbons (β-caryophyllene, bicyclogermacrene and germacrene-D) and oxygenated sesquiterpenes (spathulenol and caryophyllene oxide).
Na 2 SO 4 , pH=3). Dobijeni rezultati ukazuju na dobru inhibitorsku efikasnost ispitivanog derivata
UVODBakar i njegove legure spadaju u važan konstrukcioni materijal koji je često izložen kiseloj sredini prilikom prečišćavanja, pri otklanjanju korozionih proizvoda sa prenosnika toplote, elektrohemijskog glačanja, itd. Najčešće korišćena kiselina u ovim procesima je sumporna kiselina, u čijem prisustvu može doći do korozije bakra, pošto je formiranje pasivnog oksidnog sloja na površini metala onemogućeno [1]. Zaštita bakra u kiseloj sredini se najčešće vrši primenom korozionih inhibitora. Veliki broj molekula je do sada ispitivan kao potencijalni inhibitor korozije bakra. Na osnovu objavljenih rezultata uočljivo je da dobre inhibitorske osobine imaju organski molekuli koji u svojoj strukturi sadrže heteroatome azota, sumpora ili kiseonika [2][3][4][5][6][7][8]. Najveći broj njih ispoljava dobru inhibitorsku efikasnost u neutralnoj sredini, dok je broj jedinjenja sa dobrim zaštitinim osobinama u kiseloj sredini limitiran [9][10][11][12][13].Derivati tiazola spadaju u grupu jedinjenja koja se pokazala kao dobar inhibitor korozije bakra u kiselo-sulfatnoj sredini. Ovi organski molekuli svoje inhibitorsko dejstvo na koroziju pretežno ispoljavaju adsorpcijom na metalnu površinu usled čega se stepen korozije metala smanjuje [14][15].
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