Direct Electrochemistry of Hemoglobin Immobilized on a Functionalized Multi-Walled Carbon Nanotubes and Gold Nanoparticles Nanocomplex-Modified Glassy Carbon Electrode

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ID: 274395
2013
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Abstract
Direct electron transfer of hemoglobin (Hb) was realized by immobilizing Hb on a carboxyl functionalized multi-walled carbon nanotubes (FMWCNTs) and gold nanoparticles (AuNPs) nanocomplex-modified glassy carbon electrode. The ultraviolet-visible absorption spectrometry (UV-Vis), transmission electron microscopy (TEM) and Fourier transform infrared (FTIR) methods were utilized for additional characterization of the AuNPs and FMWCNTs. The cyclic voltammogram of the modified electrode has a pair of well-defined quasi-reversible redox peaks with a formal potential of −0.270 ± 0.002 V (vs. Ag/AgCl) at a scan rate of 0.05 V/s. The heterogeneous electron transfer constant (ks) was evaluated to be 4.0 ± 0.2 s−1. The average surface concentration of electro-active Hb on the surface of the modified glassy carbon electrode was calculated to be 6.8 ± 0.3 × 10−10 mol cm−2. The cathodic peak current of the modified electrode increased linearly with increasing concentration of hydrogen peroxide (from 0.05 nM to 1 nM) with a detection limit of 0.05 ± 0.01 nM. The apparent Michaelis-Menten constant (Kmapp) was calculated to be 0.85 ± 0.1 nM. Thus, the modified electrode could be applied as a third generation biosensor with high sensitivity, long-term stability and low detection limit.
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Authors Jun Hong, Ying-Xue Zhao, Bao-Lin Xiao, Ali Akbar Moosavi-Movahedi, Hedayatollah Ghourchian, Nader Sheibani, Jun Hong, Ying-Xue Zhao, Bao-Lin Xiao, Ali Akbar Moosavi-Movahedi, Hedayatollah Ghourchian, Nader Sheibani
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Journal sensors
Year 2013
DOI
10.3390/s130708595
URL
https://doi.org/10.3390/s130708595
Keywords
gold nanoparticles hemoglobin direct electrochemistry functionalized multi-walled carbon nanotubes nanocomplex

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