Journal
BIOSENSORS & BIOELECTRONICS
Volume 24, Issue 10, Pages 3113-3119Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2009.04.001
Keywords
PbS nanoparticles (PbS-NPs); Nanoporous gold (NPG) electrode; Differential pulse anodic stripping; voltammetry (DPASV); Au nanoparticles (Au-NPs)
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Funding
- Excellent Young Scientists Foundation of Shandong Province [J2008B02]
- Science and Technology of Qingdao [06-3-1-Y-X]
- National Natural Science Foundation of China [20775038, 20827005]
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An electrochemical stripping assay for ultrasensitive detection of target DNA was reported in this work. The protocol involved nanoporous gold (NPG) electrode modified with single-stranded DNA (ssDNA) and Au nanoparticles (Au-NPs) co-loaded with two kinds of ssDNA, one was reporter DNA which was complementary to the target DNA, the other modified with PbS nanoparticles (PbS-NPs) was signal DNA which was non-complemented, reducing the cross-reaction between the targets and reporter DNA on the same Au-NP. The amount of target DNA was determined by indirect determination of the amount of lead ions through differential pulse anodic stripping voltammetry (DPASV). This protocol could detect target DNA of as low as femtomolar and exhibited excellent selectivity against one-base mismatched DNA and non-complementary DNA. Under the optimum conditions, the anodic stripping peak current of lead demonstrated a good linear relationship with the target DNA concentration in the range of 9.0 x 10(16) to 7.0 x 10(-14) M. A detection limit of 2.6 x 10(-16) M of target DNA was achieved. (C) 2009 Elsevier B.V, All rights reserved.
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