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    Modification of halloysite clay nanotubes with various alkyl halides, and their characterization, blood compatibility, biocompatibility, and genotoxicity
    (Elsevier Ltd, 2021) Can, Mehmet; Demirci, Şahin; Yıldırım, Yıldız; Çoban, Canan Çakır ; Türk, Mustafa; Şahiner, Nurettin
    Halloysite nanotubes (HNTs) clay were modified with alkyl halides, bromoethane (BrE), bromodecane (BrD), and bromooctadecane (BrOD), respectively. The FT-IR spectra of modified HNTs demonstrated an increase in the intensity of aliphatic –CH2 peaks at 2920 and 2850 cm?1 proportional to the number of C atoms in the modifying agent confirming the success of chemical modification with corresponding alkyl halides. Surface charge of NaOH treated HNTs, ?65.7 ± 5.1 mV was increased to ?37.1 ± 2.4, ?40.6 ± 5.3, and ?44.7 ± 1.9 mV, respectively upon chemical modification with BrE, BrD, and BrOD. The Surface area of the HNT clays, 43.2 ± 1.3 m2/g was also increased to 59.8 ± 2.7, 56.9 ± 2.1, and 47.9 ± 1.7 m2/g for BrE, BrD, and BrOD modified HNT clays, respectively. Base-activated HNT clays at 1 mg/mL concentration found to be nonhemolytic with 3.5 ± 1.2% hemolysis ratio, whereas HNT-BrOD clays were slightly exceeded hemolytic safety level with 6.6 ± 0.2% hemolysis induction. Base-activated HNT and HNT-BrOD clays were found to show antithrombogenic character with more than 100% blood clotting indexes,107.6 ± 1.8, and 106.5 ± 1.9%, respectively. Cytotoxicity studies of HNTs on L929 fibroblast cells revealed that HNTs in 12.5–200 ?g/mL concentration range were shown dose-dependent cell viability, and above 50% cell viability was maintained at 200 ?g/mL in all forms of HNT based clays administered. © 2020 Elsevier B.V.
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    Poly(sucrose) micro particles preparation and their use as biomaterials
    (Elsevier, 2014) Şahiner, Nurettin; Sagbaş, Selin; Türk, Mustafa
    Crosslinked p( sucrose) micro particles were synthesized for the first time from sucrose in water-in-oil microemulsion. Using divinyl sulfone (DVS) as crosslinker via reverse micelles of sodium bis(2-ethylhexyl) sulfosuccinate (AOT) p(sucrose) micro particles formed in a single step with very high yield (>90%). The particles have wide size distributions, and negative zeta potential, -27.30 mV, and can be made magnetic field responsive. P(sucrose) particles were shown to be degradable at pHs of 2.5 and 11. Dopamine and gallic acid were used as model drugs for absorption/release studies from p(sucrose) particles. Interestingly, it was shown that p(sucrose) microparticles can be a nutrient for Escherichia coli, and maybe used as a growth medium for other cells, bacteria and organisms. Additionally, the cytotoxic effect of p(sucrose) particles were determined as 26 and 32.5% dead cells against MDA MB-231 cancerous cells and L929 fibroblast cells at 100 ug/ml concentration, respectively. P(sucrose) particles can be safely used for in vivo applications. (C) 2014 Elsevier B.V. All rights reserved.