期刊
BIOSENSORS & BIOELECTRONICS
卷 62, 期 -, 页码 73-78出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2014.06.030
关键词
beta-Lactoglobulin; Multi-wall carbon nanotube; Gold nanoparticles; Nanocomposite; Biosensor
类别
资金
- National Natural Science Foundation of China [81127001, 81273993]
A facile approach was developed for the preparation of nanocomposite based on beta-lactoglobulin (BLG)-functionalized multi-wall carbon nanotubes (MWCNTs) and gold nanoparticles (GNPs) for the first time. Owing to the amphipathic nature, BLG can be adopted onto the surface of MWCNTs to form BLG-MWCNTs with uniform dispersion in water. Taking advantage of sulfhydryl groups on BLG-MWCNTs, GNPs were decorated on the BLG-MWCNTs-modified glassy carbon electrode (GCE) by electrodeposition. The nanocomposite was characterized by transmission electron microscopy, scanning electron microscopy and X-ray spectroscopy analysis. Cyclic voltammetry and chronoamperometric method were used to evaluate the electrocatalytic ability of the nanocomposite. Furthermore, a glucose biosensor was developed based on the immobilization of glucose oxidase with cross-linking in the matrix of bovine serum albumin (BSA) on the nanocomposite modified GCE. The resulting biosensor exhibited high sensitivity (3.98 mu A mM(-1)), wider linear range (0.025-5.5 mM), low detection limit (1.1 mu M at the signal-to-noise ratio of 3) and fast response time (within 7 s) for glucose detection. (C) 2014 Elsevier B.V. All rights reserved.
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