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    Biological Activity and Optical Sensor Properties of Green Synthesis Polymer
    (Wiley-V C H Verlag Gmbh, 2022) Bahceci, Dilek Senol; Demir, Neslihan; Kocaeren, Aysel Aydin
    In this study, 4-amino-3-hydroxy-1-naphthalene sulfonic acid (Monomer) was converted to its enzyme-catalyzed oxidative polymerization (Poly-enz) in dioxane solvent by horseradish peroxidase enzyme (HRP) in the presence of hydrogen peroxide as oxidant. For the analysis of the monomer and its synthesized Poly-enz, H-1-NMR, C-13-NMR, FT-IR, TGA, and SEM measurements were determined. In addition, the optical ion sensor properties of Poly-enz against metals such as Ag+, Cd2+, Co2+, Hg2+, Ni2+, Pb2+, Zn2+, Cu2+ were examined with UV-Vis spectrophotometer. It was observed that Cu metal showed sensory properties. DNA cleavage and DNA binding activities of monomer and Poly-enz were done using by agarose gel electrophoresis and UV-Vis methods, respectively. It was seen that the Poly-enz interacted with DNA electrostatically. This enzymatic polymer was found to cleave pBR322 plasmid DNA both hydrolytically and oxidatively as well. The antioxidant activities of the compounds were examined by three different methods (DPPH, ABTS, FRAP) and it was found that the Poly-enz showed high antioxidant activity compared to its monomer. Antimicrobial activities were studied against various bacterial and yeast cultures by the minimum inhibition concentration (MIC) method. It was observed that the antimicrobial activities of the enzymatic polymer in different microorganisms increased depending on the concentration.
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    Optical Sensor Applications of Carbazole Derivative Polymers Containing Different Aliphatic Groups Against Fe3+ Metal Ion
    (Maik Nauka/Interperiodica/Springer, 2022) Kocaeren, Aysel Aydin; Bahceci, Dilek Senol; Dogan, Fatih
    The carbazole derivatives containing aromatic rings with long alkyl groups such as C-6, C-8, C-10 and 3,4-bis(4-iodophenoxy) thiophene are synthesized. The products of carbazole derivatives and 3,4-bis(4-iodophenoxy) thiophene interaction were polymerized using FeCl3 oxidant. The structural characteristics of the synthesized compounds were obtained by FT-IR and NMR spectroscopy. UV measurements are performed to determine the optical changes of the copolymers in the presence of metal ions such as Ag+, Cd2+, Co2+, Cu2+, Fe2+, Fe3+, Hg2+, Li+, Ni2+, Pb2+, Zn2+. The selectivity of Fe3+ is investigated by recording of the absorbance changes of Fe3+ solutions prepared at different concentrations. The effect of pH is also investigated in optical sensor studies. According to UV measurements, the materials containing thiophene and carbazole units can be considered as candidates for sensor production due to their selectivity towards Fe3+ ions.
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    Spectroelectrochemical properties and electrochemical stabilities of 3-layered 1-(2-aminophenyl) pyrrole derivative films
    (Elsevier, 2026) Kocaeren, Aysel Aydin
    The aim of this study was to determine the spectroelectrochemical properties and electrochemical stability of 3layer polypyrrole containing films. Within the scope of the study, polypyrrole (PPy) was produced on ITO-coated PET via electrochemical synthesis, and a three-layer composite material was developed with 1-(2-aminophenyl) pyrrole (AP). In the first layer, PPy was synthesized on ITO-coated PET in the potential range of -1.0 and + 1.0 V at a scan rate of 100 mV/s in 1 M NaClO4/ACN supporting electrolyte solution. For the second layer, PPy-AP was produced from AP on the PPy film via electrochemical reaction. In the third layer, PPy was synthesized on this film (PPy-AP) by the same method, resulting in a PPy-AP-PPy film. Optical electronic transitions of these polymer films were determined by using UV-Vis spectroscopy. TEM analysis was performed for investigation their surface morphological properties. According to TEM analysis, PPy-AP and PPy-AP-PPy contained the spherical structures, with diameters of the spherical structures being higher in the PPy-AP-PPy. The primary objective in producing these polymer films was to investigate their spectroelectrochemical behaviors and electrochemical stabilities. According to the reached experimental studies, it was observed that the absorbance value increased depending on the applied potential range. This demonstrated that the 3-layered films were successfully synthesized via electrochemical polymerization on the ITO-coated PET surface. According to their current-time cyclic voltammograms, the coloring times of the PPy and PPy-AP-PPy films were found as 3 s. The absorbance change values (Delta A) for the PPy, PPy-AP and PPy-AP-PPy films were calculated as 0.0812, 0.0021 and 0.0023, respectively. As a result, the produced films could be used as components in electronic devices with their absorbance changes depending on the potential, their response times to this change, and their electrochemical stability against potential/current depending on time.