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Öğe 1,5-dihydroxyanthraquinones and an anthrone from roots of Rumex crispus(Taylor & Francis Ltd, 2002) Günaydin, K; Topçu, G; Ion, RMFrom the roots of Ruinex crispus, two known anthraquinones and a new one together with a new anthrone were isolated and the structures of compounds 1-4 were elucidated by spectroscopic means. The singlet oxygen generation capacity was tested with 1,3-diphenylisobenzofuran (DPBF) for compounds 1-4.Öğe The chemical investigations on the ripe fruits of Ammi visnaga (LAM.) Lamarck growing in Turkey(Taylor & Francis Ltd, 2004) Günaydin, K; Beyazit, NTwo furanochromones and one furanochromone glycoside were isolated from the fruits of Ammi visnaga ( L.) Lam. They were identified as khellin, visnagin, and khellol glycoside by interpretation of spectral analyses. Quantitative determination of furanochromones in A. visnaga ( L.) ripe fruits from Hatay region ( Turkey) was carried out by ultraviolet spectrophotometry and gas chromatography. In addition, photochemical properties of furanochromones and chemical composition of essential oil were determined.Öğe Determination of khellin and visnagin in Ammi visnaga fruits by capillary electrophoresis(Elsevier Science Bv, 2002) Günaydin, K; Erim, FBA new, simple and rapid capillary electrophoresis method was developed for the identification and quantitative determination of two medically active constituents-khellin and visnagin-in the extracts of Ammi visnaga fruits. Micellar electrochromatographic separation of khellin and visnagin was carried out using 10 mmol/l borate, 50 mmol/l sodium dodecylsulfate, 25% (v/v) acetonitrile at pH 9 as running buffer. Ammi visnaga fruits were extracted with methanol and the extracts were directly injected without any purification and pre-separation processes. Coumarin was used as internal standard for quantitation and the limits of detection for khellin and visnagin were 2.36 and 1.97 mug/ml, respectively using UV detection at 245 nm. (C) 2002 Elsevier Science B V. All rights reserved.Öğe Phytochemical studies on Ruta chalepensis (lam.) lamarck(Taylor & Francis Ltd, 2005) Günaydin, K; Savci, SRuta chalepensis is a rich source of important secondary metabolites such as furanocoumarins and alkaloids. Besides, it is a medicinal plant and still used in traditional medicine. For that reason, its chemical composition, medicinal properties, and uses were reviewed in this article.
