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This study targeted to determine the total phenolic content and antioxidant activity of essential oils Cinnamomum zeylanicum, Vitis vinifera, Allium cepa and Sesamum indicum. Total phenolic content was measured by Folin-Ciocalteu assays. The antioxidant potential of the tested extracts was evaluated using DPPH, CUPRAC and total antioxidant capacity (TAC) assays. The total phenolic compounds in essential oils varied widely, ranging from 80.26±0.007 μg GAE/mL to 268.20±0.008 μg GAE/mL. Cinnamon oil exhibited higher DPPH scavenging activity and CUPRAC activity. This study revealed that essential oils of C. zeylanicum, V. vinifera, A. cepa and S. indicum are good sources of natural antioxidants. [ABSTRACT FROM AUTHOR]

In the present study, chemical composition determination and in vitro antimicrobial effects of essential oil of Achillea biebersteinii plant grown under Erzincan ecological conditions were evaluated. Extractions were carried out with Clevenger apparatus and essential oil composition was determined by Gas Chromatography-Mass Spectrometry (GC-MS). Microorganisms used for the antimicrobial studies were Salmonella enterica serovar. typhimirium ATCC 14028, Staphylococcus aureus subsp. aureus ATCC 25923, Yersinia pseudotuberculosis ATCC 911, Bacillus cereus 702 ROMA, Enterobacter aerogenes CCM 2531, Bacillus subtilis IMG 22 and Proteus vulgaris FMC 1. As a result, a total of 29 components were detected in Achillea biebersteinii. Among them, 1,8-cineole (20.36%), cyclohexanone (8.39%), 2-cyclohexen-1-one (5.38%) and spathulenol (4.19%) were found as the major components. For the in vitro antimicrobial activity determination of essential oil, disc diffusion method was used in our study. Furthermore, 12-14 mm zone diameters were detected in antimicrobial activity assay. The highest resistance zone was detected against B. subtilis with 14 mm diameter while the least resistance zone was detected against Y. pseudotuberculosis, E. aerogenes and P. vulgaris with 12 mm diameter. Consequently, it was concluded that the essential oil extracted from the A. biebersteinii grown under Erzincan ecological conditions had an inhibitory effects on the pathogenic microorganisms in used method. [ABSTRACT FROM AUTHOR]

In this study, chemical composition determination and in vitro antimicrobial effects of essential oils of Juglans regia plant grown under Aydın ecological conditions were evaluated by using disc diffusion methods. Extractions were carried out with clevenger apparatus and essential oil compositions were determined by Gas Chromatography-Mass Spectrometry (GC-MS). Microorganisms used for the antimicrobial studies were Salmonella enterica serovar typhimirium ATCC 14028 and Staphylococcus aureus subsp. aureus ATCC 25923, Yersinia pseudotuberculosis ATCC 911 and Bacillus cereus 702 ROMA, Enterobacter aerogenes CCM 2531, Bacillus subtilis IMG 22 and Proteus vulgaris FMC. As a results of, essential oils obtained from the Juglans regia leaves plant were detected to contain 9-octadecene (17.71%), hexadecanoic acid (11.32%) and, cembrene (9.49%) at most. For the in vitro antimicrobial activity determination of essential oils, disc diffusion methods were used in our study. Furthermore, 6-17 mm zone diameters were detected in disc diffusion methods respectively. The highest resistance zone were against P. vulgaris and Staphylococcus aureus subsp. aureus with 17 mm diameter while the least resistance zone was detected against Y. pseudotuberculosis, 6 mm diameter. As a result, it is thought that the essential oil content differs in quantity and composition from the past studies, due to the different geographical and environmental effects of the plant. [ABSTRACT FROM AUTHOR]