期刊
BIOSENSORS & BIOELECTRONICS
卷 26, 期 5, 页码 2119-2124出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2010.09.017
关键词
Urchinlike MnO2 nanoparticle; Carbon ionic liquid electrode; Hemoglobin; Direct electrochemistry
类别
资金
- National Science Foundation of China [50802032, 21075071]
- Young Scientist Chenguang Project of Wuhan
- Shandong Province Natural Science Foundation [ZR2009BL017]
In this paper an urchinlike MnO2 nanoparticle was synthesized by hydrothermal method and applied to the protein electrochemistry for the first time. By using a carbon ionic liquid electrode (CILE) as the basal electrode, hemoglobin (Hb) was immobilized on the surface of CILE with chitosan (CTS) and MnO2 nanoparticle composite materials. Spectroscopic results indicated that Hb molecules retained its native structure in the composite film. A pair of well-defined redox peaks appeared on the cyclic voltammogram with the formal peak potential as -0.180 V (vs. SCE), which indicated that direct electron transfer of Hb was realized on the modified electrode. The result can be attributed to the specific characteristic of MnO2 nanoparticle and the advantages of CILE, which facilitated the electron transfer rate. The fabricated CTS-MnO2-Hb/CILE showed good electrocatalytic ability to the reduction of trichloroacetic acid (TCA). Under the optimal conditions the catalytic current was in linear to TCA concentration in the range from 0.5 to 16.0 mmol L-1 with the detection limit calculated as 0.167 mmol L-1 (3 sigma). The result indicated that urchinlike MnO2 nanoparticle had the potential application in the third generation electrochemical biosensors. (C) 2010 Elsevier B.V. All rights reserved.
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