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Öğe Antimicrobial and antiviral effects of essential oils from selected Umbelliferae and Labiatae plants and individual essential oil components(TUBITAK SCIENTIFIC & TECHNICAL RESEARCH COUNCIL TURKEY, 2012) Orhan, Ilkay Erdogan; Ozcelik, Berrin; Kartal, Murat; Kan, YukselThe essential oils obtained from Anethum graveolens, Foeniculum vulgare collected at fully-mature and flowering stages, Mentha piperita, Mentha spicata, Lavandula officinalis, Ocimum basilicum (green- and purple-leaf varieties), Origanum onites, O. vulgare, O. munitiflorum, O. majorana, Rosmarinus officinalis, Salvia officinalis, and Satureja cuneifolia, as well as the widely encountered components in essential oils (gamma-terpinene, 4-allylanisole, (-)-carvone, dihydrocarvone, D-limonene, (-)-phencone, cuminyl alcohol, cuminyl aldehyde, cuminol, trans-anethole, camphene, isoborneol, (-)-borneol, L-bornyl acetate, 2-decanol, 2-heptanol, methylheptane, farnesol, nerol, isopulegol, citral, citronellal, citronellol, geraniol, geranyl ester, linalool, linalyl oxide, linalyl ester, alpha-pinene, beta-pinene, piperitone, (-)-menthol, isomenthone, carvacrol, thymol, vanillin, and eugenol), were screened for their antiviral activity against Herpes simplex type-1 (HSV-1) and parainfluenza type-3 (PI-3). Cytotoxicity was expressed as cytopathogenic effect. Most of the oils and compounds displayed strong antiviral effects against HSV-1, ranging between 0.8 and 0.025 mu g mL(-1). However, the samples tested were less effective against PI-3, with results ranging between 1.6 and 0.2 mu g mL(-1). The essential oil of A. graveolens was the-most active. Most of the tested oils and compounds exhibited good antibacterial and antifungal effects.Öğe Antioxidant and anticholinesterase effects of frequently consumed cereal grains using in vitro test models(INFORMA HEALTHCARE, 2012) Senol, F. Sezer; Kan, Asuman; Coksari, Gulay; Orhan, Ilkay ErdoganThe ethyl acetate and ethanol extracts obtained from eight varieties (Faikbey, Y-1779, CI-8357, Cheokota, Seydisehir, Y-330, Sivas and YVD-18) of oat (Avena sativa L.), one variety (Larende) of barley (Hordeum vulgare L.), one variety (Tatlicak 97) of triticale (Triticale sp.) and one rye variety (Aslim 95) (Secale cereale L.) were investigated for their antioxidant effects in seven test systems. Anticholinesterase activity of the extracts was examined by enzyme-linked immunosorbent assay (ELISA) microplate reader. Total phenol and flavonoid contents were calculated using Folin Ciocalteau and AlCl3 reagents, respectively. All of the extracts were ineffective in cholinesterase inhibition assays and had weak-to-moderate activity in antioxidant assays. The extracts exerted better activity in iron-chelation capacity ranging between 43.17 +/- 2.04 and 62.97 +/- 1.29%. Triticale extracts showed higher activity in reducing power experiments. A notable difference in the results of the antioxidant activity assays was observed among the oat varieties.Öğe Estimation of in vitro neuroprotective properties and quantification of rutin and fatty acids in buckwheat (Fagopyrum esculentum Moench) cultivated in Turkey(ELSEVIER, 2012) Gulpinar, Ali Rifat; Orhan, Ilkay Erdogan; Kan, Asuman; Senol, Fatma Sezer; Celik, Sadiye Ayse; Kartal, MuratBuckwheat (Fagopyrum esculentum Moench, Polygonaceae) is a popular food crop plant from Polygonaceae. In this study, we investigated the ethyl acetate and ethanol extracts of the seed, stem, and aerial parts of the plant for their neuroprotective effect through acetylcholinesterase, butyrylcholinesterase, and tyrosinase inhibitory and antioxidant activity. Antioxidant activity was measured using the scavenging activity tests against 2,2-diphenyl-1-picrylhydrazyl (DPPH), N,N-dimethyl-p-phenylendiamine (DMPD), superoxide, and hydrogen peroxide radicals and the metal-related methods; metal-chelating capacity and ferric-reducing antioxidant power (FRAP), and phosphomolibdenum-reducing antioxidant power (PRAP) assays. Total phenol and flavonoid contents were calculated spectrophotometrically. Chemical composition of the seed oil was identified by gas chromatography-mass spectrometry (GC-MS) and rutin was quantified by liquid chromatography-mass spectrometry (LC-MS). The extracts were more active against butyrylcholinesterase and highly able to scavenge DPPH. The ethyl acetate extract of the aerial parts and the ethanol extract of the stems displayed a remarkable effect in the FRAP assay. None of the extracts had capacity to chelate the iron. According to LC-MS analysis, the richest plant part in terms of rutin was found to be the aerial parts. GC-MS analysis revealed that the seed oil was dominated by oleic (33.15%), linoleic (31.93%), and palmitic (13.15%) acids. (c) 2011 Elsevier Ltd. All rights reserved.Öğe Evaluation of Cholinesterase Inhibitory and Antioxidant Activities of Wild and Cultivated Samples of Sage (Salvia fruticosa) by Activity-Guided Fractionation(MARY ANN LIEBERT INC, 2011) Senol, Fatma Sezer; Orhan, Ilkay Erdogan; Erdem, Sinem Aslan; Kartal, Murat; Sener, Bilge; Kan, Yuksel; Celep, FerhatIn 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.Öğe Immunomodulatory properties of various natural compounds and essential oils through modulation of human cellular immune response(ELSEVIER SCIENCE BV, 2016) Orhan, Ilkay Erdogan; Mesaik, M. Ahmed; Jabeen, Almas; Kan, YukselRandomly selected essential oils and some terpene and phenolic derivatives were evaluated for their ability to modulate human cellular immune responses using various inflammatory parameters including reactive oxygen species (ROS) generation from whole blood phagocytes and isolated polymorphonuclear neutrophils (PMNs), proliferation of T-cells, IL-2. and TNF-alpha cytokine production. The essential oils from Foeniculum vulgare, Saturea cuneifolia, and Origanum munitiflorum inhibited ROS produced from whole blood phagocytes, while thymol, carvacrol, rosmarinic acid, caffeic acid, quercetin, and kaempferol glycoside potently inhibited the ROS production from whole blood as well as from isolated PMNs, among which caffeic acid, quercetin, and kaempferol glycoside exhibited a better inhibitory effect than that of ibuprofen. The compounds rosmarinic acid, caffeic acid, quercetin, kaempferol glycoside, genistein, and apigenin (IC50 7.0 +/- 0.5, <3.12, <3.12, 4.3 +/- 1.0, 5.8 +/- 0.5, and <3.12 mu g/mL) were found to exert potent inhibition on proliferation of T -cells. On the other hand, quercetin (IC50 2.9 +/- 0.3 mu g/mL) and apigenin (IC50 <1.0 mu g/mL), were also found to be the potent inhibitor of IL-2 cytokine. The essential oils of Mentha species, and compounds quercetin and apigenin were found to potently inhibit the production of pro inflammatory cytokine TNF-alpha. The results indicated that essential oils and phenolics might be considered as promising immunomodulatory agents. (C) 2015 Elsevier B.V. All rights reserved.Öğe Inhibitory Effects of Various Essential Oils and Individual Components against Extended-Spectrum Beta-Lactamase (ESBL) Produced by Klebsiella pneumoniae and Their Chemical Compositions(WILEY, 2011) Orhan, Ilkay Erdogan; Ozcelik, Berrin; Kan, Yuksel; Kartal, MuratIn the current study, in vitro inhibitory activity of several essential oils obtained from the cultivated plants, Foeniculum vulgare, Mentha piperita and M. spicata, Ocimum basilicum, Origanum majorana, O. onites, O. vulgare, Satureja cuneifolia, and a number of individual essential oil components of terpene and aromatic types were screened against 10 isolated strains of Klebsiella pneumoniae producing extended-spectrum beta-lactamase (ESBL) enzyme, which makes this microorganism quite resistant against the antibiotics: trimetoprime-sulfametoksazol, sulbactam-ampicilin, clavulonate-amoxicilin, ceftriaxon, cefepime, imipenem, ceftazidime, tobramicine, gentamisine, ofloxacin, and ciprofloksasin. All of the essential oils and the components exerted a remarkable inhibition ranging between 32 and 64 mu g/mL against all of these strains as strong as the references (ampicilin and oflaxocin) inhibiting at 32 mu g/mL. Besides, chemical compositions of the essential oils were elucidated by gas chromatography-mass spectrometry (GC-MS). The essential oils and the pure components widely found in essential oils screened herein have shown remarkable inhibition against ESBL-producing K. pneumoniae strains, which leads to the suggestion that they may be used as food preservatives for this purpose.Öğe LC-MS quantification of parthenolide and cholinesterase inhibitory potential of selected Tanacetum L. (Emend. Briq.) taxa(ELSEVIER, 2015) Orhan, Ilkay Erdogan; Tosun, Fatma; Gulpinar, Ali Rifat; Kartal, Murat; Duran, Ahmet; Mihoglugil, Feyyaz; Akalgan, DemetThe acetonitrile extracts of various Tanacetum L. (Emend. Briq.) taxa from Turkey as well as parthenolide, a sesquiterpene lactone found in Tanacetum species as active substance were investigated for their inhibitory activity against acetylcholinesterase (AChE) and butyrylcholinesterase (BChE), the key enzymes in pathogenesis of Alzheimer's disease, at 100 mu g mL(-1) using ELISA microplate assay. Most of the extracts displayed a remarkable AChE inhibition where the leaf of Tanacetum argenteum subsp. flabellifolium had the highest inhibition (96.68 +/- 0.35%). The extracts had moderate inhibition toward BChE, among which the stem of Tanacetum argyrophyllum var. argyrophyllum-1 exerted the best inhibition (63.81 +/- 3.64%). However, parthenolide exhibited low inhibition against both of the enzymes. Total flavonoid content of the extracts was determined spectrophotometrically. Parthenolide, a sesquiterpene lactone, was quantified in these taxa by LC-MS and the leaf of T. argenteum subsp. argenteum possessed the richest parthenolide amount (2.261 +/- 0.002%), while most of the species screened were found to contain the required percentage (0.2% minimum) by European Pharmacopeia. (C) 2014 Phytochemical Society of Europe. Published by Elsevier B.V. All rights reserved.Öğe Phytochemical contents and enzyme inhibitory and antioxidant properties of Anethum graveolens L. (dill) samples cultivated under organic and conventional agricultural conditions(PERGAMON-ELSEVIER SCIENCE LTD, 2013) Orhan, Ilkay Erdogan; Senol, F. Sezer; Ozturk, Nilgun; Celik, Sadiye Ayse; Pulur, Aysen; Kan, YukselInhibitory effect of the n-hexane, dichloromethane, ethyl acetate, and ethanol extracts from Anethum graveolens L. (dill) cultivated under organic (AG-O) and conventional (AG-C) conditions was tested against acetylcholinesterase (AChE), butyrylcholinesterase (BChE), and tyrosinase at 200 mu g mL(-1). Their antioxidant activity was determined using 2,2-diphenyl-1-picrylhydrazyl (DPPH), N,N-dimethyl-p-phenylendiamine (DMPD), and nitric oxide (NO) radical scavenging assays as well as ferric ion-chelation capacity, ferric-(FRAP), and phosphomolybdenum-reducing antioxidant power (PRAP). The phytochemical analyses have been performed on both of the plant samples. GC-MS analysis pointed out that alpha-phellandrene was the main component in both of the essential oils in varying amounts (47.75% for AG-O and 27.94% for AG-C), while oleic acid was the dominant in the fruit oils of two samples (36.39% for AG-O and 53.87% for AG-C). HPLC analysis showed that both of the extracts contained rosmarinic acid as the major phenolic acid. The extracts inhibited BChE at moderate level, while the ethanol extracts exerted remarkable NO scavenging effect. The results emphasize that cultivation conditions may have effect on bioactivity and phytochemical content on plant samples. (c) 2013 Elsevier Ltd. All rights reserved.Öğe Quantification of genistein and daidzein in two endemic Genista species and their antioxidant activity(SERBIAN CHEMICAL SOC, 2011) Orhan, Ilkay Erdogan; Tosun, Fatma; Tamer, Ugur; Duran, Ahmet; Alan, Burcu; Kok, Ali FuatIn the current research, the total and free genistein and daidzein contents were determined in two endemic Genista species (G. sandrasica and G. vuralii) by an HPLC method. The highest amount of total genistein and total daidzein was found in G. sandrasica, 0.582 and 0.113 %, respectively, whereas only the free daidzein content of G. sandrasica was higher than that of G. vuralii. The antioxidant activity of the crude methanol and hydrolyzed extracts of these species was evaluated by three in vitro methods; namely DPPH free radical scavenging, ferrous ion-chelating and ferric-reducing antioxidant power (FRAP) tests at 0.25, 0.50, and 1.0 mg ml(-1). The hydrolyzed extracts of both species displayed greater antioxidant activity than the crude methanol extracts in all tests. Total phenol and flavonoid contents in the extracts were determined via the Folin Ciocalteau and AlCl3 reagents, respectively. G. vuralii was richer in terms of total phenol and flavonoid contents compared to G. sandrasica.Öğe Resveratrol, a popular dietary supplement for human and animal health: Quantitative research literature analysis - a review(POLSKA AKAD NAUK, INST GENETYKI I HODOWLI ZWIERZAT, 2019) Yeung, Andy Wai Kan; Aggarwal, Bharat Bhushan; Orhan, Ilkay Erdogan; Barreca, Davide; Battino, Maurizio; Belwal, Tarun; Bishayee, AnupamResveratrol is a stilbene-type bioactive molecule with a broad spectrum of reported biological effects. In this sense, the current work provides a comprehensive literature analysis on resveratrol, representing a highly-researched commercially available dietary ingredient. Bibliometric data were identified by means of the search string TOPIC=("resveratrol*") and analyzed with the VOSviewer software, which yielded 17,561 publications extracted from the Web of Science Core Collection electronic database. 'I'he ratio of original articles to reviews was 9.5:1. More than half of the overall manuscripts have been published since 2013. Major contributing countries were USA, China, Italy, South Korea, and Spain. Most of the publications appeared in journals specialized in biochemistry and molecular biology, pharmacology and pharmacy, food science technology, cell biology, or oncology. The phytochemicals or phytochemical classes that were frequently mentioned in the keywords of analyzed publications included, in descending order: resveratrol, trans-resveratrol, polyphenols, flavonoids, quercetin, stilbenes, curcumin, piceatannol, cis-resveratrol, and anthocyanins.
