Abstract
An amperometric biosensor for nitrite was prepared by immobilizing cytochrome c (Cyt c) on a gold electrode that was modified with Nafion and a Cu-Mg-Al layered double hydroxide (Cu-LDH). The Cu-LDH was characterized by Fourier transform infrared spectroscopy and powder X-ray diffraction. The UV-visible spectrum suggests that Cyt c retains its native conformation in the modified film. The direct electrochemical investigation indicated that the composite film represents a good platform for the immobilization of Cyt c as well as an excellent promoter for the electron transfer between Cyt c and the gold electrode. Moreover, the biosensor showed a remarkable bioelectrocatalytic activity for the oxidation of nitrite with a linear range from 0.75 to 123 μM. The detection limit is 2 × 10−7 M (S/N = 3). The biosensor was successfully applied to the determination of nitrite in food samples.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (No.20775044) and the Natural Science Foundation of Shandong province, China (Y2006B20).
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Yin, H., Zhou, Y., Liu, T. et al. Amperometric nitrite biosensor based on a gold electrode modified with cytochrome c on Nafion and Cu-Mg-Al layered double hydroxides. Microchim Acta 171, 385–392 (2010). https://doi.org/10.1007/s00604-010-0444-8
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DOI: https://doi.org/10.1007/s00604-010-0444-8