Construction of DNA biosensor at glassy carbon surface modified with 4-aminoethylbenzenediazonium salt.
Biosens Bioelectron
; 26(5): 2506-12, 2011 Jan 15.
Article
en En
| MEDLINE
| ID: mdl-21112202
ABSTRACT
A simple, label-free electrochemical impedance-spectroscopy method for sequence-specific detection of DNA using a 4-aminoethylbenzenediazonium (AEBD) salt as a binder for amino-modified probe DNA is reported. This novel method simplifies the anchoring of DNA at the GC surface and opens new ways for the detection of hybridization. The hybridization of target DNA, without and with mismatches, with the probe DNA anchored at the GC surface modified with AEBD, greatly increases the interfacial electron transfer resistance at the double-stranded DNA modified electrodes for the redox couple Fe(CN)(6)(3-/4-). The resistance was measured using electrochemical impedance spectroscopy. The sensor response increased linearly with logarithm of concentration of target DNA in the range 2×10(-12)÷2×10(-6) M. The obtained quantification limit was circa 6.5×10(-17) mole in a 7 µL droplet and corresponded to a concentration of 9.2×10(-12) M of target DNA in the sample. This limit is equivalent to the detection of circa 4×10(7) copies of DNA in a 7 µL droplet or circa 5.7×10(12) DNA copies in one litre of sample.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
ADN
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Técnicas Biosensibles
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Conductometría
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Materiales Biocompatibles Revestidos
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Compuestos de Diazonio
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Electrodos
Idioma:
En
Revista:
Biosens Bioelectron
Asunto de la revista:
BIOTECNOLOGIA
Año:
2011
Tipo del documento:
Article
País de afiliación:
Polonia