Browsing by Author "Popovic-Djordjevic, J"

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    Essential oil composition and antioxidant activity of endemic Marrubium parviflorum subsp oligodon
    Sarikurkcu, C; Ozer, MS; Calli, N; Popovic-Djordjevic, J
    In this study, chemical composition and antioxidant activity of the essential oil and solvent extracts (hexane, dichloromethane, ethyl acetate, methanol and water) obtained from aerial parts of the endemic plant Marrubium parviflorum subsp. oligodon collected from Afyonkarahisar province in Turkey were examined. The antioxidant ability of solvent extracts and essential oil was evaluated using various methods (beta-carotene-linoleic acid, 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging, and reducing power assays) and the content of total phenolics and flavonoids were determined. In the essential oil, thirty-one compounds were identified by GC/MS analysis. The major components were (Z,Z)-farnesyl acetone (19.28%), caryophyllene oxide (15.85%) and pulegone (7.15%). In all assays, water extract showed the strongest antioxidant properties due to the highest content of total phenolics. The significantly high correlations were observed between the content of total phenolics and DPPH radical (0.894) and reducing power (0.983) assays. Methanol extract was the richest in total flavonoids. The present results support the traditional and possible use of the essential oil and extracts from M. parviflorum subsp. oligodon in food, pharmaceutical, and cosmetic industries.
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    Calamintha incana: Essential oil composition and biological activity
    Popovic-Djordjevic, J; Cengiz, M; Ozer, MS; Sarikurkcu, C
    The chemical composition of the essential oils (EO) isolated aerial parts of Calamintha incana (Sm.) Boiss. from Turkey was characterized by GC-FID and GC-MS analysis. The oxygenated monoterpenes trans-piperitone oxide (41.37%), piperitenone oxide (34.47%), piperitenone (6.67%), and monoterpene phenol thymol (3.37%) were found to be the major constituents of the essential oils of C. incana. The results of the antioxidant activity in phosphomolybdenum, radical scavenging (DPPH and ABTS) and reducing power activity (CUPRAC and FRAP) as well as metal chelating effects (ferrous ion chelating) showed that EO was the most potent in ABTS (129.58 +/- 2.21 mg TEs/g oil) and CUPRAC and FRAP (51.14 +/- 0.05 and 53.63 +/- 0.10 mg TEs/g, respectively) assays. In enzymes inhibitory activity assays of EO, the best result was achieved for tyrosinase (2.10 +/- 0.30 mg KAEs/g oil). The results suggest that EO might be considered as a potential source of bioactive agents to be used in food and pharmacological industries.