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  • [ X ]
    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
    A 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.
  • Küçük Resim
    Öğe
    p-Cymene based organometallic ruthenium(II)-arene complexes with benzaldehyde derived thiosemicarbazones: synthesis, characterization and antimicrobial activity
    (Dicle Üniversitesi Tıp Fakültesi, 2017) Yavuz, Murat; Yaman, Pelin Köse; Öztürk, Nurdan; Timur, Suna; Subaşı, Elif
    Objective: Thiosemicarbazone (TSC) containing three new mononuclear ruthenium(II)-arene complexes were synthesized so as to contribute to the development of ruthenium complexes with pharmacologically attracted properties.Methods: Reactions of the ruthenium(II)-arene dimer [{RuCl(μ-Cl)(η6-p-cymene)}2] (1) with the respective TSC1-3 (1:2 molar ratio) in methanol resulted in p-cymene containing new conformationally rigid half-sandwich organometallic ruthenium(II)-arene complexes; [(η6-p-cymene)Ru(TSC1-κ3O,N,S)]Cl (I), [(η6-p-cymene)Ru(Cl)(TSC2-κ2N,S)]Cl (II), and [(η6-p-cymene)Ru(Cl)(TSC3- κ2N,S)]Cl (III). The molecular structures of complexes I, II and III were elucidated on the spectroscopic data obtained by the application of 1H NMR, Fourier transform infrared (FT-IR), UV-vis and elemental analysis techniques. In vitro antimicrobial activities of the synthesized three ruthenium(II)-arene complexes were evaluated using the disc diffusion method. Results: The spectroscopic data indicated that TSC1 was bounded to the metal as a tridentate ligand with its thione sulfur atom, phenolic oxygen atom and azomethine nitrogen atom in the complex I, while TSC2 and TSC3 were bounded to metal center as bidentate manner through their thione sulfur atom and imine nitrogen (C=N) atom in the complexes II and III, respectively. The obtained antimicrobial activity results showed that these complexes efficiently inhibit the growth of Gram-positive bacterial strains. Conclusion: The TSC1-3 containing ruthenium(II)-arene complexes were successfully synthesized and their molecular structures were also determined by the spectroscopic methods. All ruthenium(II)-arene complexes showed higher antibacterial activities against Gram-positive bacterial strains than the Gram-negative ones.
  • [ X ]
    Öğe
    Synthesis, characterization and biological application of dinuclear Cu(II) complexes of Schiff base ligands of galactochloralose and ?-chloralose
    (Elsevier Science Sa, 2018) Salman, Yesim; Barlas, Firat Baris; Yavuz, Murat; Kaya, Kerem; Timur, Suna; Telli, Fatma Cetin
    Four 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.
  • [ X ]
    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, Elif
    Ru(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.