Yazar "Kose, Kazim" seçeneğine göre listele

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    Cholesterol removal via cyclodextrin-decoration on cellulose nanocrystal (CNC)-grafted poly(HEMA-GMA) nanocomposite adsorbent
    (Springer, 2021) Kose, Kazim; Mavlan, Miran; Uzun, Lokman; Youngblood, Jeffry P.
    Glycidyl methacrylate (GMA) was grafted to cellulose nanocrystals (CNCs) using hydroquinone resulting in a crosslinkable nanoparticle. 2-Hydroxyethyl methacrylate (HEMA) was used to polymerize this nanoparticle to obtain a polymeric structure with a bridging CNC structure to which cyclodextrin (CD) was attached in order to better capture hydrophobic biomolecules. X-Ray Microscopy and nuclear magnetic resonance methods provided the main characterization data proving the successful modification process. This CD-modified nanocomposite adsorbent was used for the removal of cholesterol and low-density lipoprotein for the first time. Adsorption performance in a continuous system was similar to 99% for both cholesterol and low-density lipoprotein with agreement between experimental data and mathematical models performed. Overall, results indicate that cyclodextrin modified poly(HEMA-GMA-g-CNC) is a promising material for use as an adsorbent for biological and biomedical applications.
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    Modification of cyclodextrin and use in environmental applications
    (Springer Heidelberg, 2021) Kose, Kazim; Tuysuz, Mirac; Aksut, Davut; Uzun, Lokman
    Water pollution, which has become a global problem in parallel with environmental pollution, is a problem that needs to be solved urgently, considering the gradual depletion of water resources. The inadequacy of the water treatment methods and the materials used somehow directed the researchers to look for dual character structures such as biocompatible and biodegradable beta-cyclodextrin (beta-CD). beta-CD, which is normally insoluble in water, is used in demanding wastewater applications by being modified with the help of different agents to be water soluble or transformed into polymeric adsorbents as a result of co-polymerization via cross-linkers. In this way, in addition to the host-guest interactions offered by beta-CD, secondary forces arising from these interactions provide advantages in terms of regeneration and reusability. However, the adsorption efficiency and synthesis steps need to be improved. Based on the current studies presented in this review, in which cross-linkers and modification methods are also mentioned, suggestions for novel synthesis methods of new-generation beta-CD-based materials, criticisms, and recent methods of removal of micropollutants such as heavy metals, industrial dyes, harmful biomolecules, and pharmaceutics wastes are mentioned.
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    Molecularly imprinted polymers in toxicology: a literature survey for the last 5 years
    (Springer Heidelberg, 2021) Kose, Kazim; Kehribar, Demet Yalcin; Uzun, Lokman
    The science of toxicology dates back almost to the beginning of human history. Toxic chemicals, which are encountered in different forms, are always among the chemicals that should be investigated in criminal field, environmental application, pharmaceutic, and even industry, where many researches have been carried out studies for years. Almost all of not only drugs but also industrial dyes have toxic side and direct effects. Environmental micropollutants accumulate in the tissues of all living things, especially plants, and show short- or long-term toxic symptoms. Chemicals in forensic science can be known by detecting the effect they cause to the body with the similar mechanism. It is clear that the best tracking tool among analysis methods is molecularly printed polymer-based analytical setups. Different polymeric combinations of molecularly imprinted polymers allow further study on detection or extraction using chromatographic and spectroscopic instruments. In particular, methods used in forensic medicine can detect trace amounts of poison or biological residues on the scene. Molecularly imprinted polymers are still in their infancy and have many variables that need to be developed. In this review, we summarized how molecular imprinted polymers and toxicology intersect and what has been done about molecular imprinted polymers in toxicology by looking at the studies conducted in the last 5 years.
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    Recent Advancements and New Perspectives of Nanomaterials
    (Springer International Publishing Ag, 2019) Emul, Ezgi; Asik, Mehmet Dogan; Akcan, Ramazan; Kose, Kazim; Uzun, Lokman; Saglam, Semran; Saglam, Necdet
    [Abstract Not Available]
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    TEMPO-oxidized cellulose nanofiber based polymeric adsorbent for use in iron removal
    (Springer, 2020) Kose, Kazim; Mavlan, Miran; Nuruddin, Md; Youngblood, Jeffrey P.
    Cellulose nanofibrils (CNFs), as one of the most abundant renewable nanomaterials, has garnered interest in numerous fields owing to its many any advantages such as good mechanical properties, high surface area and surface tunability. Recently, CNFs have been shown to be a valuable candidate in water and soil treatment. In this study, adsorption of Fe(II) cations onto poly(2-hydroxy ethyl methacrylate-glycidyl methacrylate) cryogels was improved by addition of TEMPO-oxidized cellulose nanofibers (CNF). Characterization of CNF modified polymeric structures was performed using scanning electron microscopy. The effects of varying pH, initial Fe(II) concentration, and time were investigated during the study and a comparison was made to Fe(III) adsorption. Kinetic calculations were performed using Langmuir, Freundlich and Redlich-Peterson adsorption models.to understand the binding of Fe(II) cations onto the composite cryogel.