Issue 2, 2012

Electropolymerized network of polyamidoamine dendron-coated gold nanoparticles as novel nanostructured electrode surface for biosensor construction

Abstract

Polyfuntionalized gold nanoparticles were prepared by using 2-mercaptoethanesulfonic acid, p-aminothiophenol and cysteamine core polyamidoamine G-4 dendron as capping ligands. The nanoparticles were electropolymerized on a Au electrode surface through the formation of a bisaniline-cross-linked network. The enzyme tyrosinase was further crosslinked on this nanostructured matrix. The enzyme electrode, poised at −100 mV, was used for the amperometric quantification of cathecol. The biosensor showed a linear response from 50 nM to 10 μM cathecol, with a low detection limit of 20 nM and a sensitivity of 1.94 A M−1 cm2. The electrode retained 96% and 67% of its initial activity after 16 and 30 days of storage at 4 °C under dry conditions.

Graphical abstract: Electropolymerized network of polyamidoamine dendron-coated gold nanoparticles as novel nanostructured electrode surface for biosensor construction

Article information

Article type
Paper
Submitted
13 Sep 2011
Accepted
02 Nov 2011
First published
24 Nov 2011

Analyst, 2012,137, 342-348

Electropolymerized network of polyamidoamine dendron-coated gold nanoparticles as novel nanostructured electrode surface for biosensor construction

R. Villalonga, P. Díez, S. Casado, M. Eguílaz, P. Yáñez-Sedeño and J. M. Pingarrón, Analyst, 2012, 137, 342 DOI: 10.1039/C1AN15850C

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