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Title

Development of an impedimetric DNA-biosensor based on layered double hydroxide for the detection of long ssDNA sequences

AuthorsBaccar, Zouhaïr Majdi; Caballero, David; Eritja Casadellà, Ramón ; Errachid, Abdelhamid
KeywordsDNA-biosensor
DNA
Layered double hydroxide
Nanomaterials
Self-assembly
Thin layers
Electrochemical impedance spectroscopy
Issue DateJul-2012
PublisherElsevier
CitationElectrochimica Acta
AbstractDNA testing requires the development of sensitive and fast devices to measure the presence of nucleic acid sequences by DNA hybridization. In this paper, a simple and label-free DNA-biosensor has been investigated based on the detection of DNA hybridization on layered double hydroxide (LDH) nanomaterials with special emphasis on targeting long single stranded DNA sequences. First, the immobilization of a 20 bases long DNA probe on a thin layer of Mg 2AlCO 3 and Mg 3AlCO 3 LDH was studied. Then, DNA hybridization reaction was detected by means of Electrochemical Impedance Spectroscopy. The resulting biosensor showed a high sensitivity for the detection of 80 bases long DNA complementary sequences. The dynamic range was 18-270 ng/ml with a detection limit lower than 1.8 ng/ml.
Publisher version (URL)10.1016/j.electacta.2012.04.031
URIhttp://hdl.handle.net/10261/125320
DOI10.1016/j.electacta.2012.04.031
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