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    Poly (4-methoxyphenol) film as a galactose-sensing material
    (Pergamon-Elsevier Science Ltd, 2004) Ekinci, E; Pasahan, A
    Poly (4-methoxyphenol)-galactose oxidase biosensor for galactose is reported. This amperometric biosensor was prepared in a one-step procedure by electrochemical polymerization of the relevant monomer in the presence of galactose oxidase on Pt electrode surface in a KCl solution at potential of 0.6 V vs. Ag/AgCl. From the steady-state amperometric responses to galactose of the resulting polymeric biosensor, its sensor characteristics such as feasibility of preparation, linear range, response time, selectivity and stability were evaluated. (C) 2004 Elsevier Ltd. All rights reserved.
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    Synthesis, characterization and dopamine selectivity of 1,4-bis(3-aminopropyl)piperazine -: Containing polyimide
    (Springer, 2004) Pasahan, A; Köytepe, S; Ekinci, E; Seçkin, T
    A novel polyimide prepared from 1,4-bis(3-aminopropyl) piperazine and pyromellitic dianhydride (PMDA) was characterized by thermal, FTIR, GPC and microanalysis techniques. Thermal properties of the polyimide were evaluated by differential scanning calorimetry (DSC), differential thermal analysis (DTA) and thermogravimetry (TGA). Moreover, platinum electrodes were covered with this polyimide and permeation properties of the resulting polyimide-coated electrodes to dopamine and ascorbic acid were examined by electrochemical method. On the basis of the permselectivity data obtained, it was found that the polyimide-coated electrode exhibited selective permeation for dopamine while blocking ascorbic acid.
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    Synthesis, characterization and H2O2-sensing properties of pyrimidine-based hyperbranched polyimides
    (Pergamon-Elsevier Science Ltd, 2005) Köytepe, S; Pasahan, A; Ekinci, E; Seçkin, T
    A series of hyperbranched polyimides having pyrimidine core in the backbone was prepared by solution polycondensation of pyromellitic dianhydride (A(2) type) and 2,4,6-triaminopyrimidine (B-3 type). The resulting polyimides were characterized by IR, GPC, DTA, DSC, TGA, density and viscosity measurement. The results showed that polyimides were obtained in 82-86 % yield, had inherent viscosities of 1.58-1.87 dL/g and highly thermal stability. From the solubility tests, it was found that all the polyimides were soluble in NMP, DMAc and DMSO at room temperature. In addition, because of their interesting film properties, attempts were made to prepare H2O2-sensing polyimide material. For this reason, selectivity of film-coated electrodes obtained from the chemically prepared hyperbranched polyimides toward electroactive (ascorbic acid, oxalic acid and hydrogen peroxide) and non-electroactive (lactose, sucrose and urea) species was examined by means of CV, DPV and TB techniques. From the electrochemical data obtained, it has been demonstrated that polyimide (HPI-2) film responded to only hydrogen peroxide among the species examined. In other words, it has been claimed that the mentioned polyimide-coated electrode can be used as H2O-selective membrane in the presence of the electroactive and non-electroactive interferents. (C) 2004 Elsevier Ltd. All rights reserved.