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Öğe Bio-active nanoemulsions enriched with gold nanoparticle, marigold extracts and lipoic acid: In vitro investigations(Elsevier Science Bv, 2014) Guler, Emine; Barlas, F. Baris; Yavuz, Murat; Demir, Bilal; Gumus, Z. Pinar; Baspinar, Yucel; Coskunol, Hakan; Timur, SunaA novel and efficient approach for the preparation of enriched herbal formulations was described and their potential applications including wound healing and antioxidant activity (cell based and cell free) were investigated via in vitro cell culture studies. Nigella sativa oil was enriched with Calendula officinalis extract and lipoic acid capped gold nanoparticles (AuNP-LA) using nanoemulsion systems. The combination of these bio-active compounds was used to design oil in water (O/W) and water in oil (W/O) emulsions. The resulted emulsions were characterized by particle size measurements. The phenolic content of each nanoemulsion was examined by using both colorimetric assay and chromatographic analyses. Two different methods containing cell free chemical assay (1-diphenyl-2-picrylhydrazyl method) and cell based antioxidant activity test were used to evaluate the antioxidant capacities. In order to investigate the bio-activities of the herbal formulations, in vitro cell culture experiments, including cytotoxicity, scratch assay, antioxidant activity and cell proliferation were carried out using Vero cell line as a model cell line. Furthermore, to monitor localization of the nanoemulsions after application of the cell culture, the cell images were monitored via fluorescence microscope after FITC labeling. All data confirmed that the enriched N. sativa formulations exhibited better antioxidant and wound healing activity than N. sativa emulsion without any enrichment. In conclusion, the incorporation of AuNP-LA and C officinalis extract into the N. sativa emulsions significantly increased the bio-activities. The present work may support further studies about using the other bio-active agents for the enrichment of herbal preparations to strengthen their activities. (C) 2014 Elsevier B.V. All rights reserved.Öğe Biological affinity evaluation of Lawsonia inermis origin Lawsone compound and its radioiodinated form via in vitro methods(Springer, 2015) Tekin, Volkan; Muftuler, F. Zumrut Biber; Guldu, Ozge Kozgus; Kilcar, Ayfer Yurt; Medine, E. Ilker; Yavuz, Murat; Unak, Perihan; Timur, SunaWST-1-based cytotoxicity assay of lawsone (LW) was performed on MCF7, Caco2, BJ and Keratinocyte cells and viabilities were found as over 90 % for all cells. Significant wound healing effect of LW was reported on Keratinocyte cells. Antibacterial and antifungal activities of LW were tested on seven microorganisms with three concentrations and 1,000 A mu g/disc of LW showed antibacterial effect on Bacillus subtilis. In vitro cell incorporation of radioiodinated LW (I-131-LW) was evaluated on same cells. Keratinocyte cells uptake were 5 times more. Consequently, I-131-LW was found usable for researches about especially skin diseases in addition to breast and intestinal cancer.Öğe A case study on in vitro investigations of the potent biological activities of wheat germ and black cumin seed oil(Scientific Technical Research Council Turkey-Tubitak, 2015) Ag Seleci, Didem; Gumus, Zinar Pinar; Yavuz, Murat; Seleci, Muharrem; Bongartz, Rebecca; Stahl, Frank; Coskunol, Hakan; Timur, Suna; Scheper, ThomasThe objectives of this study were to investigate the potential biological activities of black cumin seed oil (BCSO) and wheat germ oil (WGO) on different cell lines. Initially, commercially available BCSO and WGO obtained by supercritical carbon dioxide extraction were analyzed in terms of tocopherol, aliphatic alcohols, and thymoquinone content via HPLC and GC analysis. Cell free antioxidant activities and total phenolic content of both oils were detected by DPPH assay and Folin-Ciocalteu method, respectively. As well as the DPPH assay, the protective effect against reactive oxygen species (ROS) was determined by microscopic observation of ROS generation in NIH-3T3 cells with or without oil samples by using an oxidation-sensitive fluorescent dye, H2DCFDA. Cytotoxicity was assessed using an MTT assay. In the case of BCSO, after exposing cells to 0.025-1.0 mg/mL and 1.0-100 mu g/mL concentrations for 24 h, the IC50 values of BCSO were 0.58, 0.51, 0.47, and 0.36 mg/mL for NIH-3T3, A549, U87, and HeLa cells, respectively. On the other hand, concentrations of WGO lower than 0.1 mg/mL did not cause a decrease in cell viability for all cell lines. Apoptotic and necrotic rates of these cell lines were investigated via flow cytometry. BCSO also exhibited proliferative efficacy for NIH-3T3 cells.Öğe CTAB modified dellite: A novel support for enzyme immobilization in bio-based electrochemical detection and its in vitro antimicrobial activity(Elsevier Science Sa, 2016) Maiga, Mohomodou; Yalcinkaya, Esra Evrim; Sonmez, Burak; Puglia, Debora; Yavuz, Murat; Demirkol, Dilek Odaci; Kenny, Jose M.; Timur, SunaA novel support material for enzyme immobilization based on cetyltrimethylammonium bromide modified Dellite (CTAB-Del) was successfully synthesized and used to manufacture pyranose oxidase (PyOx) biosensors (CTAB-Del/PyOx). The intercalation of CTAB into Dellite was confirmed by FTIR, XRD and TGA techniques. PyOx was immobilized onto the glassy carbon electrode, via glutaraldehyde crosslinking, by using CTAB-Del as a support. In order to test the analytical performance of CTAB-Del/PyOx biosensors, chronoamperometric measurements were carried out using three electrodes configurations, at a constant potential of 0.7 V in working buffer, under stirring, with successive addition of glucose. The linear response for CTAB-Del/PyOx biosensor ranged from 0.01 to 0.50 mM with an equation of y=4.42x+0.004 (R-2=0.998), and the limit of detection for glucose was calculated to be 0.081 pM (S/N = 3). In order to confirm its practical use, the CTAB-Del/PyOx biosensor was also applied for glucose measurement in various beverages. In addition, the antimicrobial activities of Del and CTAB-Del were screened in vitro by means of the disc diffusion susceptibility test, selecting a yeast, three different Gram-positive, and five different Gram-negative bacteria. The obtained results showed a moderate antibacterial activity of CTAB-Del against Gram-positive bacteria. (C) 2016 Elsevier B.V. All rights reserved.Öğe Electrochemical deposition of polypeptides: bio-based covering materials for surface design(Royal Soc Chemistry, 2014) Akbulut, Huseyin; Yavuz, Murat; Guler, Emine; Demirkol, Dilek Odaci; Endo, Takeshi; Yamada, Shuhei; Timur, Suna; Yagci, YusufA simple and efficient approach for the electrochemical deposition of polypeptides as bio-based covering materials for surface design is described. The method involves N-carboxyanhydride (NCA) ring-opening polymerization from its precursor to form a thiophene-functionalized polypeptide macromonomer (T-Pala), followed by electropolymerization. The obtained conducting polymer, namely polythiophene-g- polyalanine (PT-Pala), was characterized and utilized as a matrix for biomolecule attachment. The biosensing applicability of PT-Pala was also investigated by using glucose oxidase (GOx) as a model enzyme to detect glucose. The designed biosensor showed a very good linearity for 0.01-1.0 mM glucose. Finally, the antimicrobial activities of newly synthesized T-Pala and PT-Pala were also evaluated by using the disc diffusion method.Öğe Niosomes of Nerium oleander extracts: In vitro assessment of bioactive nanovesicular structures(Elsevier Science Bv, 2017) Gunes, Aybike; Guler, Emine; Un, Rabia Nur; Demir, Bilal; Barlas, E. Baris; Yavuz, Murat; Coskunol, Hakan; Timur, SunaNiosomes are known as non-ionic surfactant-based vesicles and have been used quite a lot for medical applications as a novel drug delivery system in recent years. Herein we describe, the preparation and characterization of niosomes containing oleander (Nerium oleander) (ONs) extract as the herbal compound. In this context, niosomal formulations of two different extracts obtained from oleander roots were prepared by a thin film hydration technique using Tween 60 (non-ionic surfactant) with a cholesterol mixture at 1:1 M ratio. These vesicular structures were characterised by various techniques such as atomic force microscopy, zeta potential and dynamic light scattering size measurements. ONs vesicles are less than 100 nm in size with a good physical stability more than 50 days. Initially, total phenolic and flavonoid contents and antioxidant activities of the extracts were investigated. The methanol extract of oleander roots (MOE) showed higher polyphenolic content and exhibits a better antioxidant activity in compared to the hydro-methanol (20% methanol) extract (MOWE). Total phenolic contents in the MOE and MOWE were calculated as 64.51 +/- 0.945 mu g/mg and 65.05 +/- 0.37 mu g/mg gallic acid equivalents, respectively. Encapsulation efficiencies of the vesicles were found as 16.2% for MON (contain MOE) and 13.24% for MWON (contain MOWE). The significant linear correlation Was confirmed between the antioxidant activity and total phenolic content of extracts as well as ONs. Cell based cytotoxic activities of methanol extract and MON formulations were also assessed via KIT assay using Hela and A549 cell lines. (C) 2016 Elsevier B.V. All rights reserved.Öğe Phyto-Niosomes: In Vitro Assessment of the Novel Nanovesicles Containing Marigold Extract(Taylor & Francis As, 2015) Un, Rabia Nur; Barlas, F. Baris; Yavuz, Murat; Seleci, Didem Ag; Seleci, Muharrem; Gumus, Z. Pinar; Guler, Emine; Demir, Bilal; Can, Mustafa; Coskunol, Hakan; Timur, SunaHerbal compounds, so-called phytoconstituents, illustrate poor absorption by living cells. Phytosomes are advanced form of herbal compounds that show higher absorption rate and bioavailability, which results better than conventional plant extracts. Niosomes, which are made of nonionic surfactants, create better chemical and stability conditions besides lipid vesicles. This study covers the preparation, characterization and cell culture applications of phyto-niosomes of Marigold extract. Before the encapsulation process, extracts of selected plants were prepared and the extract that presents best bioactivity was chosen. The resulting phyto-niosomes were characterized and their biological activities including cytotoxicity, wound healing and antioxidant activity were investigated.Öğe Ruthenium (II) complexes of thiosemicarbazone: Synthesis, biosensor applications and evaluation as antimicrobial agents(Elsevier Science Bv, 2014) Yildirim, Hatice; Guler, Emine; Yavuz, Murat; Ozturk, Nurdan; Yaman, Pelin Kose; Subasi, Elif; Sahin, Elif; Timur, SunaA conformationally rigid half-sandwich organoruthenium (II) complex [(eta(6)-p-cymene)RuClTSCN-S]Cl, (1) and carbonyl complex [Ru(CO)Cl(PPh3)(2)TSCN-S] (2) have been synthesized from the reaction of [{(eta(6)-p-cymene) RuCl}(2)(mu-Cl)(2)] and [Ru(H)(Cl)(CO)(PPh3)(3)] with thiophene-2-carboxaldehyde thiosemicarbazon (TSC) respectively and both novel ruthenium (II) complexes have been characterized by elemental analysis, FT-IR and NMR spectroscopy. The peripheral TSC in the complexes acts as an electrochemical coupling unit providing the ability to carry out electrochemical deposition (ED) and to form an electro-deposited film on a graphite electrode surface. The biosensing applicability of complexes 1 and 2 was investigated by using glucose oxidase (GOx) as a model enzyme. Electrochemical measurements at -0.9 V versus Ag/AgCl electrode by following the ED Ru(II) reduction/oxidation due to from the enzyme activity, in the presence of glucose substrate. The designed biosensor showed a very good linearity for 0.01-0.5 mM glucose. The in vitro antimicrobial activities of complexes 1 and 2 were also investigated against nine bacterial strains and one fungus by the disc diffusion test method. No activity was observed against the Gram-negative strains and fungus, whereas complex 1 showed moderate antibacterial activities against Gram-positive bacterial strains. (C) 2014 Elsevier B.V. All rights reserved.Öğe Study of Radiotherapy Properties and Antimicrobial Activity of Glyconanoparticles (GNPs) Generated from Imidazolium Salts(Wiley-V C H Verlag Gmbh, 2023) Telli, Fatma Cetin; Yavuz, Murat; Denizalti, Serpil; Salman, YesimCarbohydrate-based imidazolium salts (IMSs) are structural patterns for the synthesis of pharmaceutically and biologically active substances. For this purpose, the chiral furanoside-based imidazolium salt conjugated with a cysteamine (Cyt) linker attached gold and silver nanoparticles were prepared in this study. The biological applications of the HeLa and A549 cell lines using MTT cell proliferation method were exhibited to determine the biological evaluation of NPs conjugated with sugar based imidazolium salt. The satisfactory results obtained demonstrated that the synthesized glyconanoconjugates were radiotherapeutic agents. Moreover, this modification type within a galactose derived imidazolium salt is the first work in bioapplications, especially in radiotherapy. The antimicrobial activity of IMSs and their nanoconjugates against test pathogens was also evaluated using the disc diffusion technique.Öğe Synthesis, characterization and biological application of dinuclear Cu(II) complexes of Schiff base ligands of galactochloralose and alpha-chloralose(Elsevier Science Sa, 2018) Salman, Yesim; Barlas, Firat Baris; Yavuz, Murat; Kaya, Kerem; Timur, Suna; Telli, Fatma CetinFour novel dinuclear Cu(II) complexes (1a-4a) have been prepared from ONO-tridentate chiral Schiff base derivatives of chloralose (1-4). All the new complexes (1a-4a) have been characterized by Fourier transform infrared spectroscopy, UV-visible spectroscopy and elemental analysis. The complex 2a was further characterized by X-Ray crystallography. And also, the magnetic susceptibility measurement of this complex (2a, mu(eff) 2.61 BM/dimer) was measured at room temperature. The activities of ONO-tridentate chiral Schiff base derivatives of chloralose (1-4) and their dinuclear Cu(II) complexes (1a-4a) on viability of human cervical cancer cell line (HeLa) were investigated by MIT assay. The obtained results indicated that the Schiff base ligand 1 and its dinuclear Cu(II) complex (1a) have excellent cytotoxic activity. Also, dinuclear Cu(II) complexes of the galactochloralose and alpha-chloralose derivative Schiff base ligands were screened for their in vitro antimicrobial activity against eight bacterial species as well as yeast species Candida albicans ATCC 10231 using disc diffusion method. Complex 4a exhibited promising in vitro antimicrobial activity with inhibition zone diameter from 10 to 22 mm against the tested Gram-positive bacterial strains and yeast C. albicans.Öğe Synthesis, structural characterization, oxygen sensitivity, and antimicrobial activity of ruthenium(II) carbonyl complexes with thiosemicarbazones(Taylor & Francis Ltd, 2014) Ozturk, Nurdan; Yaman, Pelin Kose; Yavuz, Murat; Oter, Ozlem; Timur, Suna; Subasi, ElifRu(II) carbonyl complexes were prepared by reacting [Ru(H)(Cl)(CO)(PPh3)(3)] with the respective thiosemicarbazone ligands and the complexes were characterized by UV-vis, FT-IR, and H-1 and P-31 NMR spectroscopy. Oxygen sensitivities and antimicrobial activities of the complexes were determined. [Ru(CO)(PPh3)(2)(eta(3)-O, N-3, S-TSC1)] (1), [Ru(Cl)(CO)(PPh3)(2)(eta(2)-N-3, S-TSC2)] (2), and [Ru(Cl)(CO) (PPh3)2(eta(2)-N-3,S-TSC3)] (3) have been prepared by reacting [Ru(H)(Cl)(CO)(PPh3)(3)] with the respective thiosemicarbazones TSC1 (2-hydroxy-3-methoxybenzaldehyde thiosemicarbazone), TSC2 (3-hydroxybenzaldehyde thiosemicarbazone), and TSC3 (3,4-dihydroxybenzaldehyde thiosemicarbazone) in a 1 : 1 M ratio in toluene and all of the complexes have been characterized by UV-vis, FT-IR, and H-1 and P-31 NMR spectroscopy. The spectroscopic studies showed that TSC1 is coordinated to the central metal as a tridendate ligand coordinating via the azomethine nitrogen (C=N), phenolic oxygen, and sulfur to ruthenium in 1, whereas TSC2 and TSC3 are coordinated to ruthenium as a bidentate ligand through azomethine nitrogen (C=N) and sulfur in 2 and 3. Oxygen sensitivities of 1-3 and [Ru(Cl)(CO)(PPh3)(2)(eta(2)-N-3, S-TSC4)] (4), and antimicrobial activities of 1-3 have been determined.
