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Öğe Effects of B2O3 (boron trioxide) on colon cancer cells: our first-step experience and in vitro results(Tubitak Scientific & Technological Research Council Turkey, 2019) Albuzi, Ozgur; Dulger, Dilek; Tunali, Beste Cagdas; Aydin, Feray; Yalcin, Selim; Turk, MustafaBoron oxide (B2O3) is derived from dehydration of boric acid and is a colorless, semitransparent, crystalline compound that is moderately soluble in water. On the other hand, boron oxide is chemically hygroscopic. This gives the molecule the ability to soak up water and adhere to tissues. Boron oxide can be used locally after tumor debulking in inoperable tumors and especially when the twnor-free margin distance cannot be provided. For all these reasons we aimed to evaluate the in vitro test results of B2O3, in terms of cytotoxicity, genotoxicity, apoptosis, and necrotic effects on L929 fibroblast cells and DLD-1 colorectal adenocarcinoma cells. Our studies demonstrated that boron oxide compounds appear to be highly cytotoxic for both cell lines according to WST cell viability assay (44.22% and 18.36% on DLD-1 and L929, respectively). Although no genotoxic effects were observed, boron oxide compounds showed antiproliferative effects for both cell lines. The prepared boron oxide compounds may hold the potential to be applied locally to the remaining tissue after surgery and further research and evaluation will be needed to determine its effectivenesss.Öğe Hydroxyapatite-based nanoparticles as a coating material for the dentine surface: An antibacterial and toxicological effect(Elsevier Sci Ltd, 2020) Erdem, Umit; Dogan, Mustafa; Metin, Aysegul U.; Baglar, Serdar; Turkoz, Mustafa B.; Turk, Mustafa; Nezir, SaffetIn this study, nano sized hydroxyapatite (nHAp) and Ag(I) doped hydroxyapatite (Ag-nHAp) particles were synthesized by the precipitation method and used as a coating material for remineralization on caries-affected dentine samples. Characterization studies of both the synthesized hydroxyapatite-based particles and the coated dentine samples were performed using instrumental techniques such as SEM and FFIR, and then toxicity and antibacterial properties were also evaluated. It was observed that dentine samples were effectively coated by both nHAp and Ag center dot nHAp particles which have no toxic effects. Furthermore, the costing of nano-hydroxyapatite on dentine samples positively contributed to the viability of L929 fibroblast cells and also provided an antibacterial effect against to bacteria such as S. mutants, C. albicans and E. coli bacteria that are most frequently caused caries in the teeth. While all type of bacteria was eliminated by the nHAp coated dentine samples at 24th, Ag-nHAp coated dentine samples removed to all bacteria type at 1st.Öğe Spectral analysis and biological activity assessment of silver doped hydroxyapatite(Taylor & Francis Ltd, 2021) Erdem, Umit; Bozer, Busra Moran; Turkoz, Mustafa B.; Metin, Aysegul U.; Yildirim, Gurcan; Turk, Mustafa; Nezir, SaffetIn this study, the hydroxyapatite biomaterials are produced by the precipitation method and the role of silver doping within the different molar ratios of 2.0, 5.0, and 10.0% are investigated with some fundamental analysis, including powder XRD, SEM, EDS, FTIR, Raman, and material densities. In vitro biocompatibility assessment is conducted with cytotoxicity and agar diffusion tests. Moreover, genotoxicity tests determine whether the biomaterials produced cause the mutations or not. In addition, a hemolytic effect test examines the variation of hemolytic behavior of compounds. Also, the cell migration experiments inspect the influence of silver ion levels in biomaterials on many biological processes. The experimental results reveal that the honeycomb-patterned morphological structures are obtained for all the products. FTIR and Raman analyses reveal that the dramatic changes in the characteristic functional group peaks are obtained with the increment in the amount of silver ions. The experimental parts related to the biocompatibility assessment of the study show that there seems to be deterioration in biocompatibility as the silver ion-doping level increases in the system. To sum up, the ideal doping value for bone tissue engineering applications is found to be 2%.Öğe Syntheses, spectroscopic and crystallographic characterizations of cis- and trans-dispirocyclic ferrocenylphosphazenes: molecular dockings, cytotoxic and antimicrobial activities(Royal Soc Chemistry, 2018) Tumer, Yasemin; Asmafiliz, Nuran; Zeyrek, C. Tugrul; Kilic, Zeynel; Acik, Leyla; Celik, S. Pinar; Turk, MustafaNew cis-(4-6) and trans-dispirocyclic ferrocenylphosphazene derivatives (7-9) were obtained by reactions of hexachlorocyclotriphosphazene (N3P3Cl6) with N-alkyl-N-monoferrocenyldiamines of the formula FcCH(2)NH(CH2)(n)NHR [n = 2, R = CH3 (1); n = 2, R = C2H5 (2) and n = 3, R = CH3 (3)]. Characterizations of the products were performed using MS, FTIR, H-1, C-13 and P-31 NMR techniques. The crystal structures of 5 (with 8), 6, 7 and 9 were determined by X-ray crystallography. The most important result of this study was that the trans chiral phosphazenes crystallized as only one enantiomer. Studies of the antibacterial and antifungal activity of the phosphazenes (4-9) showed that compounds 6 and 7 were effective against P. vulgaris and K. pneumoniae. The cytotoxic activities of 4-9 against L929 fibroblasts and DLD-1 colon cancer cells were investigated. The necrotic effects of 4 and 7 were greater in the DLD-1 cell line than those in the L929 cell line. DFT calculations were carried out using the B3LYP functional with the LANL2DZ basis set to determine the energies, the orientations of the molecular orbitals (HOMOs and LUMOs) and the molecular electrostatic potential (MEP) surfaces of the partly substituted cyclotriphos-phazenes (6, 7 and 9). The results for 6, 7 and 9 revealed that these bonded to the active sites of A-DNA and B-DNA by weak non-covalent interactions, which was also supported by molecular docking investigations.
