Myoglobin within graphene oxide sheets and Nafion composite films as highly sensitive biosensor
A highly sensitive biosensor was fabricated by incorporating myoglobin (Mb) within graphene oxide (GO) sheets and Nafion composite films. The stable composite Mb–GO–Nafion films were characterized by electrochemistry, scanning electron microscopy, Fourier transform infrared spectroscopy and UV–vis s...
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Elsevier Sequoia
2012
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| Online Access: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3617930/ |
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pubmed-36179302013-04-08 Myoglobin within graphene oxide sheets and Nafion composite films as highly sensitive biosensor Guo, Changchun Sun, Hong Zhao, X.S. Article A highly sensitive biosensor was fabricated by incorporating myoglobin (Mb) within graphene oxide (GO) sheets and Nafion composite films. The stable composite Mb–GO–Nafion films were characterized by electrochemistry, scanning electron microscopy, Fourier transform infrared spectroscopy and UV–vis spectroscopy. It was found that Mb in Mb–GO–Nafion films retained its secondary structure similar to its native states. Cyclic voltammetry of Mb–GO–Nafion films showed a pair of well defined, quasi-reversible peaks at about −0.312 V vs saturated calomel electrode (SCE) at pH 5.5, corresponding to direct electron transfer (DET) between Mb and the glassy carbon electrode. Electrochemical parameter of Mb in Mb–GO–Nafion film such as apparent heterogeneous electron transfer rate constant (ks) and formal potential (Eo′) were obtained. The dependence of Eo′ on solution pH indicated that the DET reaction of Mb was coupled with proton transfer. Mb in the films displayed good electrocatalytic activities towards various substrates such as hydrogen peroxide, nitrite and oxygen, indicating that the composite films have potential applications in fabricating novel biosensors without using mediators. Elsevier Sequoia 2012-03-31 /pmc/articles/PMC3617930/ /pubmed/23576844 http://dx.doi.org/10.1016/j.snb.2012.01.057 Text en © 2012 Elsevier B.V. This document may be redistributed and reused, subject to certain conditions (http://www.elsevier.com/wps/find/authorsview.authors/supplementalterms1.0) . |
| repository_type |
Open Access Journal |
| institution_category |
Foreign Institution |
| institution |
US National Center for Biotechnology Information |
| building |
NCBI PubMed |
| collection |
Online Access |
| language |
English |
| format |
Online |
| author |
Guo, Changchun Sun, Hong Zhao, X.S. |
| spellingShingle |
Guo, Changchun Sun, Hong Zhao, X.S. Myoglobin within graphene oxide sheets and Nafion composite films as highly sensitive biosensor |
| author_facet |
Guo, Changchun Sun, Hong Zhao, X.S. |
| author_sort |
Guo, Changchun |
| title |
Myoglobin within graphene oxide sheets and Nafion composite films as highly sensitive biosensor |
| title_short |
Myoglobin within graphene oxide sheets and Nafion composite films as highly sensitive biosensor |
| title_full |
Myoglobin within graphene oxide sheets and Nafion composite films as highly sensitive biosensor |
| title_fullStr |
Myoglobin within graphene oxide sheets and Nafion composite films as highly sensitive biosensor |
| title_full_unstemmed |
Myoglobin within graphene oxide sheets and Nafion composite films as highly sensitive biosensor |
| title_sort |
myoglobin within graphene oxide sheets and nafion composite films as highly sensitive biosensor |
| description |
A highly sensitive biosensor was fabricated by incorporating myoglobin (Mb) within graphene oxide (GO) sheets and Nafion composite films. The stable composite Mb–GO–Nafion films were characterized by electrochemistry, scanning electron microscopy, Fourier transform infrared spectroscopy and UV–vis spectroscopy. It was found that Mb in Mb–GO–Nafion films retained its secondary structure similar to its native states. Cyclic voltammetry of Mb–GO–Nafion films showed a pair of well defined, quasi-reversible peaks at about −0.312 V vs saturated calomel electrode (SCE) at pH 5.5, corresponding to direct electron transfer (DET) between Mb and the glassy carbon electrode. Electrochemical parameter of Mb in Mb–GO–Nafion film such as apparent heterogeneous electron transfer rate constant (ks) and formal potential (Eo′) were obtained. The dependence of Eo′ on solution pH indicated that the DET reaction of Mb was coupled with proton transfer. Mb in the films displayed good electrocatalytic activities towards various substrates such as hydrogen peroxide, nitrite and oxygen, indicating that the composite films have potential applications in fabricating novel biosensors without using mediators. |
| publisher |
Elsevier Sequoia |
| publishDate |
2012 |
| url |
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3617930/ |
| _version_ |
1611968032648724480 |