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Ilkay Erdogan-Orhan,Mehmet Levent Altun,Betül Sever-Yilmaz,Gülçin Saltan 한국식품영양과학회 2011 Journal of medicinal food Vol.14 No.4
Some Viburnum species are used for preparation of the traditional drink called gilaburu in Anatolia. In the current study, our goal was to evaluate acetylcholinesterase (AChE) inhibitory and antioxidant activities of the ethyl acetate, methanol, and water extracts prepared from the branches, leaves, and fruits of Viburnum opulus and Viburnum lantana along with salicin, amentoflavone, and chlorogenic acid, three major compounds abundantly found in these species. AChE enzyme inhibition was tested in vitro using an enzyme-linked immunosorbent assay microplate reader at 50, 100, and 200 μL/mL concentrations. Antioxidant activity was examined by ferrous ion chelating capacity, ferric reducing antioxidant power, and β-carotene bleaching assay at 500, 1,000, and 2,000 μg/mL. Total phenol and flavonoid contents of the extracts were also established by Folin-Ciocalteau and AlCl_3 reagents, respectively. Our data revealed that the leaf methanol extract of V. opulus displayed a significantly high inhibitory effect against AChE (57.63 ± 1.23%, 87.41 ± 0.99%, and 93.19 ± 0.87% at 50, 100, and 200 μg/mL, respectively). The extracts of V. lantana exerted higher antioxidant activity.
Ilkay Erdogan-Orhan,Betül Sever-Yılmaz,M. Levent Altun,Gülçin Saltan 한국식품영양과학회 2010 Journal of medicinal food Vol.13 No.6
The ethyl acetate, methanol, and water extracts of 16 Ballota species (Family Lamiaceae)—Ballota acetabulosa, Ballota antalyanse, Ballota cristata, Ballota glandulosissima, Ballota inaequidens, Ballota larendana, Ballota latibracteolata, Ballota macrodonta, Ballota nigra ssp. anatolica, B. nigra ssp. foetida, B. nigra ssp. nigra, B. nigra ssp. uncinata, Ballota pseudodictamnus ssp. lycia, Ballota rotundifolia, Ballota saxatilis ssp. brachyodonta, and B. saxatilis subsp. saxatilis—were screened for their 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical quenching, ferric-reducing antioxidant power, and ferrous ion-chelating capacity at 1mg/mL. Hispanolone, a major diterpene found in the Ballota genus, was also tested in the same manner. Total phenol and flavonoid contents of the extracts were determined by Folin-Ciocalteau and AlCl3 reagents, respectively. The extracts showed insignificant quenching activity against DPPH radical, but they had moderate antioxidant activity (0.597±0.03 to 1.342±0.01) in the ferric-reducing test compared to chlorogenic acid (the reference compound) (3.618±0.01). All of the extracts (ranging from 65.1±0.64% to 96.3±0.09%) and hispanolone (97.31±0.30%) exerted a remarkable ferrous ion-chelating effect. The highest total phenol (gallic acid equivalent) and flavonoid (quercetin equivalent) contents were found in the ethyl acetate extract of B. glandulosissima (393.7±3.03 and 140.6±1.97mg/g of extract, respectively). Therefore, Ballota species could be a good source of natural preservatives in foodstuffs.
Terpenoids from Two Sponge Species of the Aegean Sea
Ilkay Erdogan,Junichi Tanaka,Tatsuo Higa,Bilge Sener 한국생약학회 1999 Natural Product Sciences Vol.5 No.4
The ethanolic extracts of two shallow water sponge species collected from the Aegean Sea afforded thirteen terpenoids in total, two of which were determined to be new. The structure elucidation of the terpenoids was carried out by spectroscopic techniques and comparison with related authentic compounds. The terpenoids have also been assayed for antibacterial activity. This is the first report about the metabolites isolated from the marine sponges of the Aegean Sea in Turkey.
Fatma Sezer Şenol,Ilkay Erdogan Orhan,Sinem Aslan Erdem,Murat Kartal,Bilge Şener,Yu¨ksel Kan,Ferhat Celep,Ahmet Kahraman,Musa Dogan 한국식품영양과학회 2011 Journal of medicinal food Vol.14 No.11
In European folk medicine, Salvia species have traditionally been used to enhance memory. In our previous study of 55 Salvia taxa, we explored significant anticholinesterase activity of cultivated S. fruticosa. In this study, we compared the inhibitory activity of dichloromethane, ethyl acetate, and ethanol extracts of 3 wild-grown samples and 1 cultivated sample of S. fruticosa against acetylcholinesterase and butyrylcholinesterase enzymes (which are associated with pathogenesis of Alzheimer's disease) by using the spectrophotometric Ellman method. Antioxidant activities were assessed by determining 2,2-diphenyl-1-picrylhydrazyl radical–scavenging activity, iron-chelating capacity, and ferric-reducing antioxidant power. The dichloromethane extract of the cultivated sample was then subjected to fractionation by using open column chromatography and medium-pressure liquid chromatography to obtain the most active fraction by activity-guided fractionation. All fractions and subfractions were tested in the same manner, and inactive subfractions were discarded. The essential oil of the cultivated sample was analyzed by gas chromatography–mass spectrometry.