LUQUE GUILLERMINA LETICIA
Artículos
Título:
Electrooxidation of DNA at glassy carbon electrodes modified with multiwall carbon notubes dispersed in polyethylenimine
Autor/es:
G. L. LUQUE, A. GRANERO, S. BOLLO, N. F. FERREYRA, G A. RIVAS
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Año: 2011 vol. 56 p. 9121 - 9121
Resumen:
his work reports the electrochemical response of the complex between
dsDNA and PEI formed in solution and at the surface of glassy carbon electrodes (GCE) modified with a dispersion of multi-walled carbon nanotubes
in polyethylenimine (CNT-PEI). Scanning Electron Microscopy and
Scanning Electrochemical Microscopy demonstrate that the dispersion
covers the whole surface of the electrode although there are areas with
higher density of CNT and, consequently, with higher electrochemical
reactivity. The adsorption of DNA
at GCE/CNT-PEI is fast and it is mainly driven by electrostatic forces.
A clear oxidation signal is obtained either for dsDNA or a
heterooligonucleotide of 21 bases (oligoY) at potentials smaller than
those for the oxidation at bare GCE. The comparison of the behavior of