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    Chemical composition, antimicrobial and antioxidant properties of Thymus eigii M. Zohary & P. H. Davis essential oil
    (2010) Azaz A.D.; Kucukbay Z.; Celen S.; Kuyumcu E.; Yildiz B.
    The family Lamiaceae is represented by 45 genera, 546 species and 730 taxa in Turkey. The genus Thymus is represented in Turkey by 38 species; the ratio of endemism in the genus is 53%. Thymus eigii samples collected from Hatay were subjected to hydrodistillation to yield essential oils that were subsequently analysed by Gas Chromatography (GC) and Gas Chromatography/Mass Spectrometry (GC/MS). The main constituents of the oils were identified and antimicrobial and antioxidant bioassays were applied. The T.eigii white flowers oil contained carvacrol (43.63%), p-cymene (20.55 %) and thymol (16.06%); T.eiigi with purple flowers oil contained geranyl acetate (15.66 %), p-cymene (14.62%) and thymol (11.48%) as the main components. All tested microorganisms were inhibited by the essential oil samples. Antioxidant activity was tested using the 2,2-diphenyl-l-picrylhydrazyl (DPPH) radical-scavenging method. The antioxidant activity of the tested essential oils were slightly lower than butylated hydroxyanisole (BHA) and so the essential oils can be considered effective natural antioxidants. © Essential Oil Resource Consultants. All rights reserved.
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    Chemical composition, antimicrobial and antioxidant properties of Thymus haussknechtii Velen. essential oil
    (2012) Celen S.; Azaz A.D.; Kucukbay F.Z.
    The chemical composition, the antimicrobial and antioxidant activities of essential oil of Thymus haussknechtii has been investigated. T. haussknechtii collected from Erzincan was subjected to hydrodistillation to yield essential oil which was subsequently analyzed by Gas Chromatography (GC) and Gas Chromatography/Mass Spectrometry (GC/MS). The main components were 1,8-cineole (23.6 %), trans-verbenol (6.6 %), camphor (6.12 %) and caryophyllene oxide (6 %). The antimicrobial activity of the essential oil was assessed by both the disc diffusion and microbroth dilution methods. All tested microorganisms were inhibited by essential oil sample. The essential oil is also active on test fungi. Aspergillus flavus and A. niger were sensitive to the investigated oil with MIC values of 500 ?g/mL. The antioxidant activity of the essential oil (100-1000 ?g/mL) was determined by means of the DPPH radical-scavenging method. At 1000 ?g/mL concentration of the essential oil T. haussknechtii, 35.11 ± 0.22 % DPPH was scavenging.