期刊
TALANTA
卷 78, 期 3, 页码 647-652出版社
ELSEVIER
DOI: 10.1016/j.talanta.2008.12.001
关键词
Electrochemical biosensor; Polymerase-extending DNA hybridization; Nanopore membrane; E. cali O157:H7
资金
- National Natural Science Foundation of China [60725102]
- Natural Science Foundation for the Zhejiang Province of China [R205505]
A novel biosensor based on single-stranded DNA (ssDNA) probe functionalized aluminum anodized oxide (AAO) nanopore membranes was demonstrated for Escherichia cali O157:H7 DNA detection. An original and dynamic polymerase-extending (PE) DNA hybridization procedure is proposed, where hybridization happens in the existence of Taq DNA polymerase and dNTPs under controlled reaction temperature. The probe strand would be extended as long as the target DNA strand, then the capability to block the ionic flow in the pores has been prominently enhanced by the double strand complex. We have investigated the variation of ionic conductivity during the fabrication or the film and the hybridization using cyclic voltammetry and impedance spectroscopy. The present approach provides low detection limit for DNA (a few hundreds of pmol), rapid label-free and easy-to-use bacteria detection, which holds the potential for future use in various ss-DNA analyses by integrated into a self-contained biochip. (C) 2008 Elsevier B.V. All rights reserved.
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