Silver nanoparticle-modified electrode for the determination of nitro compound-containing pesticides.

This paper reports the electroanalytical determination of pendimethalin and ethyl parathion by square-wave adsorptive stripping voltammetry using a material comprised of chitosan-stabilized silver nanoparticles to modify a glassy carbon electrode. Under optimized experimental conditions, the peak current was found to vary linearly with the concentration of pendimethalin in the range of 70 to 2000 nmol L(-1) and with concentration of ethyl parathion in the range of 40 to 8000 nmol L(-1). Detection limits of 36 and 40 nmol L(-1) were obtained for pendimethalin and ethyl parathion, respectively.

A label-free electrochemical immunosensor based on an ionic organic molecule and chitosan-stabilized gold nanoparticles for the detection of cardiac troponin T.

A label-free electrochemical immunosensor based on an ionic organic molecule ((E)-4-[(4-decyloxyphenyl)diazenyl]-1-methylpyridinium iodide) and chitosan-stabilized gold nanoparticles (CTS-AuNPs) was developed for the detection of cardiac troponin T (cTnT). The new ionic organic molecule was strategically employed as a redox probe, and CTS-AuNPs were applied as a "green" platform for the immobilization of the monoclonal anti-cTnT antibody, for the construction of the immunosensor. The characterization of the proposed immunosensor was carried out by employing cyclic and square-wave voltammetry and electron microscopy.