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    Electrochemical glucose biosensing by pyranose oxidase immobilized in gold nanoparticle-polyaniline/AgCl/gelatin nanocomposite matrix
    (2010) Ozdemir C.; Yeni F.; Odaci D.; Timur S.
    A novel pyranose oxidase (PyOx) biosensor based on gold nanoparticles (AuNPs)-polyaniline(PANI)/AgCl/gelatin nanocomposite has been developed for the glucose detection. PyOx was immobilized on the surface of glassy carbon electrode (GCE) via the nanocomposite matrix. The electrode surface was imaged by scanning electron microscopy (SEM). Amperometric detection of the consumed oxygen during the enzymatic reaction was monitored at -0.7 V. After optimization studies, analytical characterization of the biosensor was carried out. The linear response of the AuNPs-AgCl/PANI/gelatin modified PyOx biosensor is found to be from 0.05 to 0.75 mM glucose with the equation of y = 2.043x + 0.253; R2 = 0.993. Finally, proposed biosensor was used to analyze glucose content in real samples. Obtained data from the biosensing system was compared with a commercial enzyme assay kit based on spectrophotometric Trinder reaction as a reference method. © 2009 Elsevier Ltd. All rights reserved.
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    Use of eggshell membrane as an immobilization platform in microbial sensing
    (2008) Yeni F.; Odaci D.; Timur S.
    A new microbial biosensor was developed by immobilizing Pseudomonas fluorescens cells on eggshell membrane via physical adsorbtion. Bacteria-modified eggshell membrane was fixed tightly onto the surface of a carbon paste electrode (CPE) with a silicone rubber o-ring to construct a microbial biosensor. The measurements were based on the respiratory activity of the cells caused by oxygen consumption during bacterial metabolism. A mediated biosensor was also developed by ferrocene. As well as the response characteristics, stabilities and substrate specificities were investigated. Data were given as the comparison of mediated and unmediated systems. Copyright © Taylor & Francis Group, LLC.