Journal
BIOSENSORS & BIOELECTRONICS
Volume 24, Issue 8, Pages 2352-2357Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2008.12.004
Keywords
Sodium alginate-multiwall carbon nanotubes composite film; Hemoglobin; Direct electron transfer; Electrocatalysis; Biosensor
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Funding
- National Natural Science Foundation of China [20805010]
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This study described the bioelectrochemistry of hemoglobin (Hb) at multiwall carbon nanotubes (MWCNTs) noncovalently functionalized with biopolymers of sodium alginate (SA). The characteristics of Hb/SA-MWCNTs composite film were studied by using FT-IR spectroscopy, UV-vis spectroscopy and electrochemical methods. Hb immobilized on SA-MWCNTs composite film retained its native secondary structure, achieved direct electron transfer with the apparent heterogeneous electron transfer rate constant (k(s)) of (9.54 +/- 0.883)s(-1) and showed excellent bioelectrocatalytic activity to the reduction of hydrogen peroxide. The amperometric response of the biosensor varied linearly with the H2O2 concentration ranging from 40 to 200 mu M, with a detection limit of 16.41 X 10(-6) M (S/N = 3) and the good long-term stability. Finally, we applied this proposed method to investigate the concentration of hydrogen peroxide in real samples. (C) 2008 Elsevier B.V. All rights reserved.
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