• HANDE ORHAN

      Articles written in Bulletin of Materials Science

    • 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.

    • Heavy metal removal by $N$-acetylcysteine-functionalized cryogels

      SINEM EVLI ARIFE ALEV KARAGÖZLER GÜLSEN GÜVEN HANDE ORHAN MURAT UYGUN DENIZ AKTAS UYGUN

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      In the present work, $N$-acetylcysteine attached poly(acrylamide-co-methyl methacrylate) [poly(AAm-MMA)] cryogels were synthesized and used for removal of heavy metal ions (Zn(II), Cd(II) and Pb(II)). For this, poly(AAm-MMA)cryogels were synthesized by free radical cryopolymerization technique and then, modified by $N$-acetylcysteine. Synthesized cryogel was characterized by FTIR, SEM and EDX analyses. Removed amounts of heavy metal were demonstrated by stripping voltammetry and the heavy metal removal efficiency was found to be 98.33 for Zn(II), 90.74 for Cd(II) and 96.19% for Pb(II). Additionally, this newly synthesized cryogel was successfully used for removal of heavy metals fromenvironmental and biological media.

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