Abstract
In this paper, we describe DNA electrochemical detection for genetically modified organism (GMO) based on multi-wall carbon nanotubes (MWCNTs)-doped polypyrrole (PPy). DNA hybridization is studied by quartz crystal microbalance (QCM) and electrochemical impedance spectroscopy (EIS). An increase in DNA complementary target concentration results in a decrease in the faradic charge transfer resistance (Rct) and signifying "signal-on" behavior of MWCNTs-PPy-DNA system. QCM and EIS data indicated that the electroanalytical MWCNTs-PPy films were highly sensitive (as low as 4 pM of target can be detected with QCM technique). In principle, this system can be suitable not only for DNA but also for protein biosensor construction.
Original language | English |
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Pages (from-to) | 1164-1169 |
Number of pages | 6 |
Journal | Talanta |
Volume | 80 |
Issue number | 3 |
DOIs | |
Publication status | Published - 2010 Jan |
Bibliographical note
Funding Information:T.T.N. Lien wishes to thank the receipt of a grant from the Flemish Interuniversity Council for University Development cooperation (VLIR UOS), V.T.H. An would like to acknowledge HUT university grant T2008-01 . J.S. Kim is grateful for grant of Creative Research Initiative program supported by MEST.
Keywords
- Electrochemical DNA biosensor
- Electrochemical impedance spectroscopy
- MWCNTs-doped polypyrrole
- Quartz crystal microbalance
ASJC Scopus subject areas
- Analytical Chemistry