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Emre Çevik,Mehmet Şenel,M. Fatih Abasıyanık 한국물리학회 2010 Current Applied Physics Vol.10 No.5
A galactose biosensor was developed by immobilizing galactose oxidase (GAox) on poly (glycidyl methacrylate-co-vinylferrocene) (poly (GMA-co-VFc)) film. The enzyme was immobilized via amine group onto polymeric mediator. The biosensor was characterized by the specific activity of the immobilized galactose oxidase, the apparent Michaelis constant , and the stability expressed by time and a number of the performed analysis. The optimized galactose biosensor exhibited a linear response range from 2 to 20 M and detection limit of 0.1 mM toward galactose. The response time of the biosensor was 5 s. The effects of the pH and the temperature of the immobilized galactose oxidase electrode were also studied.
Emre Çevik,Mehmet S¸ enel,Abdulhadi Baykal,M. Fatih Abasıyanık 한국물리학회 2013 Current Applied Physics Vol.13 No.8
An amperometric phenol biosensor was constructed by using poly(glycidylmethacrylate-co-vinyl ferrocene) grafted iron oxide nanoparticles for detection of different phenolic compounds (catechol, aminophenol, phenol, p-cresol, pyrogallol). The poly(glycidylmethacrylate-co-vinyl ferrocene) and nanoparticles were characterized by Fourier transform infrared (FT-IR), X-ray diffraction (XRD) and transmission electron microscopy (TEM). The copolymer grafted iron oxide nanoparticles and Horseradish peroxidase (HRP) were covalently attached on gold (Au) electrode surface. The effect of pH, temperature and characteristic features such as; reusability and storage stability were studied. The electrode showed good response time within w3 s. The electrocatalytic response showed a linear dependence on the phenolic compounds concentration ranging from 0.5 to 17.0 mM.
İbrahim Bozgeyik,Mehmet Şenel,Emre Çevik,M. Fatih Abasıyanık 한국물리학회 2011 Current Applied Physics Vol.11 No.4
An amperometric biosensor has been developed for the measurement of urea. To construct the proposed biosensor urease enzyme was immobilized onto poly(N-glycidylpyrrole-co-pyrrole) conducting film by direct covalent attachment. The biosensor surface was characterized by FTIR spectroscopy and atomic force microscopy (AFM). The response studies were carried out as a function of urea concentration with amperometric measurements. The biosensor showed a linear current response to the urea concentration ranging from 0.1 to 0.7 mM. The urea biosensor exhibited a sensitivity of 4.5 μA/mM with a response time of 4 s. The factors influencing on the performance of the resulting biosensor were also studied in detail.