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    Antioxidant and antimicrobial effects of hypericumretusumaucher plant extracts prepared in various solvents
    (2013) Akgöz Y.; Toker Z.
    In this study, the antioxidant and antimicrobial effects of petroleum ether, hexane, ethyl acetate and methanol extracts of Hypericum retusum Aucher are investigated. The antioxidative potential of H. retusum extracts was examined using different antioxidant tests, including the total amount of phenolic components (Folin & Ciocalteu reagent method), total amount of flavonoids, l,l-diphenyl-2-picryl hydrazyl (DPPH)) radical scavenging, metal chelating, reducing power, and hydroxyl radical activities. At the same time, antimicrobial effects were examined in 6 types of bacteria {Escherichia coli ATCC 25922, Staphylococcus aureus ATCC 25923, Staphylococcus pyogenes ATCC 19615, Bacillus subtilis ATCC 11774, Bacillus cereus, Pseudomonas aeruginosa ATCC 27853). It has been observed from the experiments that extracts of H. retusum have high antioxidant effects and in addition, antimicrobial activity on bacteria. © by PSP.
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    Öğe
    Composition of essential oil of Carthamus glaucus Bieb. subsp. glaucus
    (Chemical Publishing Co., 2008) Toker Z.; Keskin C.
    The essential oil of water distilled aerial parts of Carthamus glaucus Bieb. subsp. glaucus (Compositae) was analyzed by GC/MS. 23 Components were characterized representing 87.3% of total component in oil sample. The major components were linalool (38.5%), longifolene (6.8%) and caryophyllene oxide (6.2%).
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    Effect of UV-C on production of hypericin in Hypericum triquetrifolium turra grown under in-vitro conditions
    (2009) Namli S.; Toker Z.; Işikalan Ç.; Özen H.Ç.
    In this study, the effects of UV-C radiation on the increasing of hypericin in Hypericum triquetrifolium Turra were investigated by using in vitro techniques. The mature seeds of Hypericum triquetrifolium Turra were germinated in Murashige and Skoog (MS) medium without hormone under in vitro conditions, and the shoots obtained were successfully reproduced in MS medium supplemented with 0.25 mg L-1 BA (N6-benzylaminopurine). The UV-C radiation was applied to Hypericum triquetrifolium Turra at different periods (15, 30, 45, 60 min). Although the hypericin content increased at 15-min UV-C radiation, it decreased after 60 min of application. Depending upon different parameters of UV-C radiation, some morphological alterations were observed in shoots.