Abstract
We report on a novel matrix of solgel organic–inorganic nanocomposite that was fabricated from silica sol gel and dextran. It was used for the immobilization of horseradish peroxidase (HRP) to give a biosensor for hydrogen peroxide (H2O2). The sensor film was characterized by Fourier transform infrared and UV–vis spectroscopy with respect to structural features and the conformation of the enzyme. The topographies of the surface of the electrode were investigated by field emission scanning electron microscopy. The biosensor was used to determine H2O2 quantitatively in the presence of Methylene blue as a mediator with high electron transfer efficiency. A pair of stable and well defined quasi-reversible redox peaks of the HRP [Fe (III)]/HRP [Fe (II)] redox couple was observed at pH 7.0. The biosensor responds to H2O2 in the 0.5 mM to 16.5 mM concentration range, and the limit of detection is 0.5 mM.
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Acknowledgments
Authors are grateful to D. Y. Patil University, Kolhapur for Financial support received under the D. Y. Patil University sponsored project DYPU/BMT/R&D/100.
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Satvekar, R.K., Rohiwal, S.S., Raut, A.V. et al. A silica-dextran nanocomposite as a novel matrix for immobilization of horseradish peroxidase, and its application to sensing hydrogen peroxide. Microchim Acta 181, 71–77 (2014). https://doi.org/10.1007/s00604-013-1065-9
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DOI: https://doi.org/10.1007/s00604-013-1065-9