期刊
ANALYST
卷 139, 期 19, 页码 5014-5020出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4an00874j
关键词
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资金
- National Natural Science Foundation of China [51039001, 51378190]
- fundamental Research Funds for the Central Universities, Hunan University
- Top Young Talents Program from Chinese Government
- Program for Changjiang Scholars and Innovative Research Team in University [IRT-13R17]
- Hunan Provincial Innovation Foundation For Postgraduate [CX2009B080]
A sensitive electrochemical lead ion (Pb2+) sensor based on carboxylic acid group functionalized multi-walled carbon nanotubes (MWNTs-COOH) and direct electrodeposited gold nanoparticles (GNPs) was developed for Pb2+ detection. The DNA capture probe was self-assembled onto the surface of the modified electrode for hybridizing with the guanine-rich (G-rich) aptamer probe and for forming the DNA double helix structure. When Pb2+ was added in, the DNA duplex unwound and formed a stabilized G-quadruplex (G4) due to the Pb2+-induced G-rich DNA conformation. Also, methylene blue (MB) was selected as the G4-binding indicator. Compared with previous Pb2+ sensors, the proposed sensor had better sensitivity, because the modified MWCNTs/GNPs could provide a large surface area and good charge-transport capacity to dramatically improve the DNA attachment quantity and sensor performance. The sensor could detect Pb2+ in a range from 5.0 x 10(-11) to 1.0 x 10(-14) M, with a detection of 4.3 x 10(-15) M.
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