Abstract
In this work, we report the fabrication of a sensitive electrochemical DNA impedance biosensor for the detection of sequence-specific target DNA. p-Aminobenzoic acid was first immobilized on the surface of the electrode modified with single walled carbon nanotubes with carboxylic acid groups (SWCNTs) by cyclic voltammetry (CV). A single-stranded DNA probe with a NH2 group at the end (H2N-ssDNA) was then covalently immobilized on the surface of polymeric film at room temperature. The impedance measurement was performed in a solution containing 5 mM K3[Fe(CN)6]/K4[Fe(CN)6]. The change of interfacial charge transfer resistance (R CT) was confirmed the hybrid formation. The difference of R CT was linear with the logarithm of complementary oligonucleotides concentrations in the range of 1.0 × 10−12 to 1.0 × 10−7 M, with a detection limit of 3.5 × 10−13 M (S/N = 3).
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Published in Russian in Elektrokhimiya, 2011, Vol. 47, No. 12, pp. 1464–1470.
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Wang, M., Gong, W., Meng, Q. et al. Electrochemical DNA impedance biosensor for the detection of DNA hybridization with polymeric film, single walled carbon nanotubes modified glassy carbon electrode. Russ J Electrochem 47, 1368–1373 (2011). https://doi.org/10.1134/S1023193511120123
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DOI: https://doi.org/10.1134/S1023193511120123