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.

Cobalt phthalocyanine as a biomimetic catalyst in the amperometric quantification of dipyrone using FIA.

A biomimetic sensor for the determination of dipyrone was prepared by modifying carbon paste with cobalt phthalocyanine (CoPc), and used as an amperometric detector in a flow injection analysis (FIA) system. The results of cyclic voltammetry experiments suggested that CoPc behaved as a biomimetic catalyst in the electrocatalytic oxidation of dipyrone, which involved the transfer of one electron. The optimized FIA procedure employed a flow rate of 1.

[Salmonella spp., important pathogenic agent transmitted through foodstuffs].

The occurrence of foodborne diseases has been a matter of discussion over the last years due to the worldwide concern with strategies for their control and for ensuring that safe food products reach the consumer. Salmonella spp. is among the most widespread microorganisms in nature, having man and animals as main natural reservoirs.