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Application Of Enzyme Immobilized Nanostructured Fe Doped TiO2 For Electrochemical Quantification Of Urea | 6113
ISSN: 2155-9872

Journal of Analytical & Bioanalytical Techniques
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Application of Enzyme Immobilized Nanostructured Fe doped TiO2 for Electrochemical Quantification of Urea

International Conference & Exihibition On Analytical and Bioanalytical Techniques - 2010

Ravi Ranjan Pandey, Krishan Kumar Saini, Marshal Dhayal

ScientificTracks Abstracts: J Anal Bioanal Techniques

DOI: 10.4172/2155-9872.1000001

Abstract
Electrochemical enzymatic biosensors detect their targets based on enzymatic catalysis of a reaction that produces or consumes electrons. Electron communication between the enzymes and the electrode is a major barrier in the development of electrochemical enzymatic sensors. One of the reasons for this is that the active redox centers of enzymes are deeply embedded in an electrically insulate protein shell. In order to address this problem, we have utilized Fe doped metal oxide (TiO 2 ) films as the shuttles to transport electrons between the electrode and the redox centers of enzymes. An electrochemical biosensor was fabricated for the quantitative determination of urea in aqueous medium using PBS, at pH-7.2. The urease (Urs) was immobilized onto an electrode made of Fe doped TiO 2 films onto an indium-tin oxide (ITO) coated glass substrate using sol-gel technique. The linkage between the Urs enzyme and Fe doped TiO 2 films provided the resulting enzyme electrode (Urs/Fe-TiO 2 /ITO) with a high level of enzyme immobilization and excellent lifetime stability. The response studies were carried out as a function of urea concentration with amperometric measurements. The biosensor based on Urs/Fe-TiO 2 /ITO as the working electrode showed an enhanced sensitivity of urea, indicating the Urs enzyme immobilized on the electrode surface had a high affinity to urea.
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