INVESTIGADORES
PEDANO Maria Laura
artículos
Título:
Layer-by-layer deposition of chitosan derivatives and DNA on gold surfaces for the development of biorecognition layers
Autor/es:
M. L. PEDANO, L. MARTELL, J. DESBRIÈRES, P. DUMMY, P. LABBÉ, R. CALEMCZUK AND G. A. RIVAS.
Revista:
ANALYTICAL LETTERS
Editorial:
Taylor & Francis
Referencias:
Año: 2004 vol. 37 p. 2235 - 2250
ISSN:
0003-2719
Resumen:
We describe a new supramolecular architecture obtained by deposition of
double-stranded deoxyribonucleic acid (dsDNA) and chitosan derivatives
on a thiolated gold surface. Surface plasmon resonance was used to
monitor, in real time, the construction of the supramolecular architecture.
Three chitosan derivatives were used, a quaternized N-substituted by
three methyl groups in a 40.0mol%, and two others N-substituted with
an octyl chain in a 5.0 and 25.0mol%. The multilayer formation depends
on the degree of substitution of chitosan as well as on the nature of the substituents.
The adsorption of dsDNA is slower than that of chitosan. The best
immobilization of dsDNA is obtained by using a quaternized chitosan and
dsDNA prepared in 0.050Macetate buffer pH 5.00. The system is stable in
buffer solution independently of the nature of the chitosan derivative. The
effect of the nature of the electrolyte and ionic strength is also discussed.
on a thiolated gold surface. Surface plasmon resonance was used to
monitor, in real time, the construction of the supramolecular architecture.
Three chitosan derivatives were used, a quaternized N-substituted by
three methyl groups in a 40.0mol%, and two others N-substituted with
an octyl chain in a 5.0 and 25.0mol%. The multilayer formation depends
on the degree of substitution of chitosan as well as on the nature of the substituents.
The adsorption of dsDNA is slower than that of chitosan. The best
immobilization of dsDNA is obtained by using a quaternized chitosan and
dsDNA prepared in 0.050Macetate buffer pH 5.00. The system is stable in
buffer solution independently of the nature of the chitosan derivative. The
effect of the nature of the electrolyte and ionic strength is also discussed.
on a thiolated gold surface. Surface plasmon resonance was used to
monitor, in real time, the construction of the supramolecular architecture.
Three chitosan derivatives were used, a quaternized N-substituted by
three methyl groups in a 40.0mol%, and two others N-substituted with
an octyl chain in a 5.0 and 25.0mol%. The multilayer formation depends
on the degree of substitution of chitosan as well as on the nature of the substituents.
The adsorption of dsDNA is slower than that of chitosan. The best
immobilization of dsDNA is obtained by using a quaternized chitosan and
dsDNA prepared in 0.050Macetate buffer pH 5.00. The system is stable in
buffer solution independently of the nature of the chitosan derivative. The
effect of the nature of the electrolyte and ionic strength is also discussed.