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- W2040219921 abstract "A nitrite (NO2−) sensor has been fabricated by immobilizing cytochrome c (Cyt c) on a graphene/gold nanoparticle-chitosan (Gra/Au NPs–Chit) modified glass carbon electrode (GCE). Graphene/gold nanoparticles (Gra/Au NPs) nanocomposite was prepared by dispersing graphene in an aqueous solution of β-cyclodextrin (β-CD) and hydrogen tetrachloroaurate and followed by NaBH4 reduction. An aliquot of Gra/Au NPs in a 0.50 wt% chitosan solution was drop-coated on the surface of a GCE to form a Gra/Au NPs–Chit/GCE which was subsequently adsorbed with Cyt c. The Cyt c–Gra/Au NPs–Chit/GCE shows a quasi-reversible cyclic voltammetric redox couple at a formal potential of −0.037 V (vs. SCE) in 0.10 M pH 7.0 phosphate buffer solution, suggesting that Gra/Au NPs–Chit film offers a biocompatible microenvironment for the Cyt c. It was found that the Cyt c–Gra/Au NPs–Chit sensor displays good electrocatalytic activity for NO2− oxidation at a relatively low working potential. The sensor possesses a linear response range of 10.0–420.0 μM NO2− with a correlation coefficient of 0.9989 and a sensitivity of 110.0 μA mM−1. The limit of detection is determined as 2.46 μM NO2− based on a signal-to-noise ratio of 3. The proposed sensor has been applied successfully to the determination of NO2− in spiked and real water samples." @default.
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- W2040219921 date "2012-01-01" @default.
- W2040219921 modified "2023-10-16" @default.
- W2040219921 title "Electroanalytical properties of cytochrome c with direct electron transfer on graphene/gold nanoparticles chitosan modified glass carbon electrode" @default.
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- W2040219921 doi "https://doi.org/10.1039/c2ay25763g" @default.
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