Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10430109 | Biosensors and Bioelectronics | 2005 | 7 Pages |
Abstract
Gold electrodes modified by nanogold aggregates (nanogold electrode) were obtained by the electrodeposition of gold nanoparticles onto planar gold electrode. The Electrochemical response of single-stranded DNA (ssDNA) probe immobilization and hybridization with target DNA was measured by cyclic voltammograms (CV) using methylene blue (MB) as an electroactive indicator. An improving method using long sequence target DNA, which greatly enhanced the response signal during hybridization, was studied. Nanogold electrodes could largely increase the immobilization amount of ssDNA probe. The hybridization amount of target DNA could be increased several times for the manifold nanogold electrodes. The detection limit of nanogold electrode for the complementary 16-mer oligonucleotide (target DNA1) and long sequence 55-mer oligonucleotide (target DNA2) could reach the concentration of 10â9Â mol/L and 10â11Â mol/L, respectively, which are far more sensitive than that of the planar electrode.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Shu-feng Liu, Yong-fang Li, Jin-ru Li, Long Jiang,