Yazar "Kıvrak, Şeyda" için listeleme
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Assessment of Bioactive Compounds and Antioxidant Activity of Turkey Tail Medicinal Mushroom Trametes versicolor (Agaricomycetes)
Kıvrak, İbrahim; Kıvrak, Şeyda; Karababa, Ersan (Begell House Inc, 2020)Trametes versicolor is important for its medicinal rather than nutritional value. It has a variety of pharmacological activities. The purpose of this study was to elucidate the bioactive properties of the wild medicinal ... -
Assessment of Volatile Oil Composition, Phenolics and Antioxidant Activity of Bay (Laurus nobilis) Leaf and Usage in Cosmetic Applications
Kıvrak, Şeyda; Göktürk, Tolga; Kıvrak, İbrahim (2017)In this study, the components of the volatile oil obtained from Laurus nobilis leaves by steam distillation were determined using Agilent 6890 Gas Chromatography (GC) - 5975 Mass Spectrometry (MS). The antioxidant activities ... -
Boronic acid-functionalized silica microparticles for isolation of flavonoids from Hypericum perforatum
Çetinkaya, Onur; Çiçek, Hüseyin; Kıvrak, Şeyda; Tel Çayan, Gülsen (Turkish Chemical Society, 2018)We have selectively separated cis-and/or vicinal-diol-containing flavonoids from Hypericum perforatum (HP) by adsorption/desorption used aminophenylboronic acid (APBA) functionalized uniform (1.6 ?m) silica microparticles ... -
Can Riboflavin Penetrate Stroma Without Disrupting Integrity of Corneal Epithelium in Rabbits? Iontophoresis and Ultraperformance Liquid Chromatography With Electrospray Ionization Tandem Mass Spectrometry
Novruzlu, Şahin; Özel Türkcü, Ummuhani; Kıvrak, İbrahim; Kıvrak, Şeyda; Yüksel, Erdem; Deniz, Nuriye Gokcen; Bilgihan, Kamil (Lippincott Williams & Wilkins, 2015)Purpose:To examine riboflavin concentrations in corneas and aqueous humor from rabbits with standard and transepithelial methods and iontophoresis without disrupting the integrity of the corneal epithelium before corneal ... -
Characterization of Turkish honeys regarding of physicochemical properties, and their adulteration analysis
Kıvrak, Şeyda; Kıvrak, İbrahim; Karababa, Ersan (Soc Brasileira Ciencia Tecnologia Alimentos, 2017)This work was conducted to evaluate the quality of 54 honey samples from eighteen different origins from Turkey. Physicochemical properties were examined according to AOAC methods, total phenolic and flavonoid contents by ... -
Determination of Phenolic Composition of Tilia Tomentosa Flowers Using UPLC-ESI-MS/MS
Kıvrak, Şeyda; Göktürk, Tolga; Kıvrak, İbrahim (2017)Phenolic compounds, which are secondary metabolites of plants, are one of the main groups of compounds that provide antiallergic, antiinflammatory, antimicrobial, antioxidant, cardioprotective properties of medicinal and ... -
Development and validation of modified QuEChERS method coupled with GC-MS/MS for 123 pesticide residues in food
Harmandar, Mansur; Kıvrak, Şeyda (2018)In this study, a gas chromatography-tandem mass spectrometry (GCMS/MS) instrument, which has been widely used in recent years and has high separation power, selectivity and ability to identify pesticides has been used. It ... -
Development of a rapid method for the determination of antibiotic residues in honey using UPLC-ESI-MS/MS
Kıvrak, İbrahim; Kıvrak, Şeyda; Harmandar, Mansur (Soc Brasileira Ciencia Tecnologia Alimentos, 2016)An accurate, reliable and fast multianalyte/multiclass ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) method was developed and validated for the simultaneous analysis of 23 pharmaceuticals, ... -
Essential oil composition and antioxidant activities of eight cultivars of Lavender and Lavandin from western Anatolia
Kıvrak, Şeyda (Elsevier Science Bv, 2018)The aim of this study was to examine the essential oil compositions and antioxidant activities of six L. angustifolia cultivars and two L. x intermedia in Turkey. The chemical composition of essential oils obtained by ... -
In vitro antioxidant, anticholinesterase and antimicrobial activity studies on three Agaricus species with fatty acid compositions and iron contents: A comparative study on the three most edible mushrooms
Öztürk, Mehmet; Duru, Mehmet Emin; Kıvrak, Şeyda; Mercan-Doğan, Nazime; Turkoğlu, Aziz; Özler, Mehmet Ali (Pergamon-Elsevier Science Ltd, 2011)The fatty acids of Agaricus essettei, Agaricus bitorquis and Agaricus bisporus were investigated by using GC and GC-MS. The dominant fatty acids were found to be linoleic (61.82-67.29%) and palmitic (12.67-14.71%) acids ... -
Investigation of Chemical Composition and Nutritional Value of Truffle Mushroom (Tuber nitidum Vittad.)
Kıvrak, Şeyda; Kıvrak, İbrahim (2018)Truffles are very precious and expensive mushrooms owing to their distinctive aroma and great flavor. The present study was carried out to survey the nutritional value of Tuber nitidum, a wild edible mushroom belonging to ... -
Myrtus communis L.: Characterisation of Essential Oil of Leaves and Fatty Acids of Seeds Using Gas Chromatography-Mass Spectrometry (GC/MSD)
Kıvrak, Şeyda (2018)In this study, the chemical contents of essential oil acquired from Myrtus communis leaves using hydrodistillation and seed oil obtained using cold press method analyzed with gas chromatography-mass spectrometry (GC/MSD). ... -
NUTRITIONAL VALUE, PHENOLIC, VITAMIN AND MINERAL CONTENTS OF A FERMENTED BEVERAGE FROM GRAPES OF 'MERLOT' AND 'CABERNET SAUVIGNON'
Kıvrak, Şeyda; Kıvrak, İbrahim; Karababa, Erşan (Hoehere Bundeslehranstalt Und Bundesamt Fuer Wein- Und Obstbau, 2016)In this study, Hardaliye, the non-alcoholic fermented beverage from 'Merlot' and 'Cabernet Sauvignon grapes, was successfully examined for its nutritional value, phenolic compounds, water-soluble vitamin and mineral contents, ... -
Serum indoleamine 2,3 dioxygenase and tryptophan and kynurenine ratio using the UPLC-MS/MS method, in patients undergoing peritoneal dialysis, hemodialysis, and kidney transplantation
Yılmaz, Nigar; Üstündağ, Yasemin; Kıvrak, Şeyda; Kahvecioğlu, Serdar; Çelik, Hüseyin; Kıvrak, İbrahim; Huysal, Kağan (Taylor & Francis Ltd, 2016)Background: The level and activity of indoleamine 2,3-dioxygenase (IDO) and the concentrations of L-tryptophan and its metabolite L-kynurenine were determined in association with various renal diseases. However, there have ... -
Ultrasonic-assisted extraction method of phenolic compounds in Extra-Virgin Olive Oils (EVOOs) by Ultra Performance Liquid Chromatography-Tandem Mass Spectrometry (UPLC-MS/MS)
Kıvrak, Şeyda; Kıvrak, İbrahim (Taylor & Francis Inc, 2020)There is an increasing trend in the consumption of extra virgin olive oil, owing to its health benefits. These health benefits are mainly correlated to health-promoting phenolic components. The aim of this study was to ...
