Retracted article: A catechol biosensor based on a gold nanoparticles encapsulated-dendrimer

摘要

Tyrosinase has been immobilized on a Au nanoparticles encapsulated-dendrimer bonded conductingnpolymer on a glassy carbon electrode for the estimation of catechol. The modified electrode wasncharacterized by cyclic voltammetry and AFM techniques. The principle of catechol estimation wasnbased on the reduction of biocatalytically liberated quinone species at +0.2 V versus Ag/AgCl (3 MnKCl), with good stability, sensitivity, and featuring a low detection limit (about 0.002 mM) and widenlinear range (0.005 mM–120 mM). The electrochemical redox peak of catechol on the GCE/PolyPATTDen(AuNPs)/tyrosinase was also investigated. A response time of 7 s, reusability up to 5 cycles andna shelf life of more than 2 months under refrigerated conditions were reported. Various parametersninfluencing biosensor performance have been optimized including pH, temperature, and appliednpotential. The utility and application of this nanobiosensor was tested in a real water samples.