Bioelectrochemistry of hemoglobin immobilized on a sodium alginate-multiwall carbon nanotubes composite film

H. Y. Zhao, W. Zheng, Z. X. Meng, H. M. Zhou, X. X. Xu, Z. Li, Y. F. Zheng*

*Corresponding author for this work

Research output: Contribution to journalArticle

131 Citations (Scopus)

Abstract

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 (ks) 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 μM, with a detection limit of 16.41 × 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.

Original languageEnglish
Pages (from-to)2352-2357
Number of pages6
JournalBiosensors and Bioelectronics
Volume24
Issue number8
DOIs
Publication statusPublished - 15 Apr 2009
Externally publishedYes

Keywords

  • Biosensor
  • Direct electron transfer
  • Electrocatalysis
  • Hemoglobin
  • Sodium alginate-multiwall carbon nanotubes composite film

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