Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.22/6733
Título: A label-free DNA aptamer-based impedance biosensor for the detection of E. coli outer membrane proteins
Autor: Queirós, Raquel B.
de-los-Santos-Álvarez, N.
Noronha, João P. C.
Sales, M. Goreti F.
Palavras-chave: DNA
Aptamer
E. coli
OMPs
Biosensor
Faradaic impedance spectroscopy
Data: 2013
Editora: Elsevier
Resumo: A label-free DNA aptamer-based impedance biosensor for the detection of E. coli outer membrane proteins (OMPs) was developed. Two single stranded DNA sequences were tested as recognition elements and compared. The aptamer capture probes were immobilized, with and without 6-mercapto-1-hexanol (MCH) on a gold electrode. Each step of the modification process was characterized by Faradaic impedance spectroscopy (FIS). A linear relationship between the electron-transfer resistance (Ret) and E. coli OMPs concentration was demonstrated in a dynamic detection range of 1 × 10−7–2 × 10−6 M. Moreover, the aptasensor showed selectivity despite the presence of other possible water contaminates and could be regenerated under low pH condition. The developed biosensor shows great potential to be incorporated in a biochip and used for in situ detection of E. coli OMPs in water samples.
URI: http://hdl.handle.net/10400.22/6733
DOI: 10.1016/j.snb.2013.01.062
Versão do Editor: http://www.sciencedirect.com/science/article/pii/S0925400513000798
Aparece nas colecções:ISEP – BioMark – Artigos

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