• DENIZ AKTAS UYGUN

      Articles written in Bulletin of Materials Science

    • Hydrophobic nano-carrier for lysozyme adsorption

      CANAN ALTUNBAS FULDEN ZEYNEP URAL MURAT UYGUN NESIBE AVCIBASI UGUR AVCIBASI DENIZ AKTAS UYGUN SINAN AKGÖL

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      In this work, poly(HEMA–APH) nanoparticles were synthesized by surfactant-free emulsion polymerization technique.Magnetic behaviour was introduced by simple addition of Fe$_3$O$_4$ into the polymerization medium.Characterization of the nanoparticle was carried out by FTIR, ESR, SEM, AFM and EDX analyses. These synthesized magnetic nanoparticles were used for adsorption of lysozyme. For this purpose, adsorption conditions wereoptimized and maximum lysozyme binding capacity was found to be 278.8 mg g$^{−1}$ polymer in pH 7.0 phosphate buffer at 25$^{\circ}$C. Desorption and reusability properties of the nanoparticles were investigated and lysozyme adsorption efficiency did not change significantly at the end of the 10 successive reuses.

    • Metal-chelated cryogels for amyloglucosidase adsorption: application for continuous starch hydrolysis

      SINEM EVLI HANDE ORHAN PELIN SÖZEN AKTAS MURAT UYGUN DENIZ AKTAS UYGUN

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      In the present work, a newmetal-chelating platformwas designed by using IDA as a chelating agent and Cu(II) as an affinity component for amyloglucosidase adsorption. Poly(AAm-GMA) cryogels were used as structural elements, whileGMA monomer served reactive epoxy groups for IDA immobilization. Synthesized cryogels were characterized by FTIR, SEM and EDX studies. Pore diameter of the whole polymeric structure was 3–10 $\mu$m. Effects of medium pH, temperature,ionic strength along with amyloglucosidase concentrationwere also investigated for more effective amyloglucosidase adsorption and maximum adsorbed amount of amyloglucosidase was 2.93 mg g$^{−1}$ cryogel by the optimum conditions. Reusability profile of the poly(AAm-GMA)-IDA-Cu$^{2+}$ cryogels was also studied and it was found that the synthesized cryogels could be used repeatedly for many times without any significant decrease on their adsorption capacity. Also continuous hydrolysis of starch by using immobilized form of amyloglucosidase in a column system was studied.

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