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artículos
Título:
Dispersion of bamboo type multi-wall carbon nanotubes in calf-thymus double stranded DNA
Autor/es:
EMILIANO PRIMO; PAULINA CA NETE-ROSALES; SOLEDAD BOLLO; M. DOLORES RUBIANES; GUSTAVO A. RIVAS
Revista:
COLLOIDS AND SURFACES B-BIOINTERFACES
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2013 vol. 108 p. 329 - 336
ISSN:
0927-7765
Resumen:
We report for the first time the use of double stranded calf-thymus DNA (dsDNA) to successfully disperse bamboo-like multi-walled
carbon nanotubes (bCNT). The dispersion and the modified electrodes were
studied by different spectroscopic, microscopic and electrochemical techniques. The drastic treatment for dispersing the bCNT (45 min sonication in a 50% (v/v) ethanol:water solution), produces a partial
denaturation and a decrease in the length of dsDNA that facilitates the dispersion of CNT and makes pos-
sible an efficient electron transfer of guanine residues to the electrode. A critical analysis of the influence
of
different
experimental
conditions
on
the
efficiency
of
the
dispersion
and
on
the
performance
of
glassy
carbon electrodes (GCE) modified with bCNTdsDNA dispersion is also reported. The electron transfer of
redox probes and guanine residues was more efficient at GCE modified with bCNT dispersed in dsDNA
than
at
GCE
modified
with
hollow
CNT
(hCNT)
dispersed
in
dsDNA,
demonstrating
the
importance
of
the
presence of bCNT.
