期刊
BIOSENSORS & BIOELECTRONICS
卷 24, 期 10, 页码 2985-2990出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2009.03.008
关键词
Manganese dioxide; Cysteine; Electrochemical sensor; Selectivity; Detection
类别
资金
- National Natural Science Foundation [20890020, 20775033]
- National Natural Science Funds for Creative Research Groups [20821063]
- 973 Program [2007CB936404]
- 863 program [2007AA022001]
- New Century Excellent Talents in University of China
We report a simple approach for the selectively electrochemical sensing of cysteine (CySH) using beta-MnO2 nanowires modified glassy carbon (GC) electrode via a direct and facile electrochemical co-deposition process with chitosan hydrogel. The electrode showed excellent electrocatalytic effect toward cysteine oxidation. A possible reaction mechanism related to the formation of surface complexes was proposed: the -SH group is the reacting group in the reaction between cysteine and MnO2, while the -NH2 group acts as an anchor to stabilize the surface complexes. The electrocatalytic behavior is further developed as a sensitive detection scheme for cysteine by amperometric measurement, which shows a large determination range of 0.5-630 mu M and a low detection limit of 70 nM. Other nineteen amino acids in a 20-fold concentration do not interfere in the detection of cysteine. Furthermore, other biological species containing -SH group or S-S bonds, such as glutathione, cystine, and bovine serum albumin (BSA). show no interferences because of steric hindrance and inactive S-S bonds. (C) 2009 Elsevier B.V. All rights reserved.
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