Artículos de revistas
A Very Low Potential Electrochemical Detection Of L-cysteine Based On A Glassy Carbon Electrode Modified With Multi-walled Carbon Nanotubes/gold Nanorods.
Registro en:
Biosensors & Bioelectronics. v. 50, p. 202-9, 2013-Dec.
1873-4235
10.1016/j.bios.2013.06.036
23859920
Autor
Silva, Francisco de Assis dos Santos
da Silva, Monique Gabriella Angelo
Lima, Phabyanno Rodrigues
Meneghetti, Mario Roberto
Kubota, Lauro Tatsuo
Goulart, Marilia Oliveira Fonseca
Institución
Resumen
A nanohybrid platform built with multi-walled carbon nanotubes and gold nanorods, prepared via a cationic surfactant-containing seed-mediated sequential growth process, in aqueous solution, on a glassy carbon substrate has been successfully developed to be used in the electrocatalytic oxidation of L-cysteine (Cys). The nanohybrid was characterized by transmission electron microscopy, Raman spectroscopy and electrochemical measurements. Cyclic voltammetry results had shown that the modified electrode allows the oxidation of Cys at a very low anodic potential (0.00 V vs. Ag/AgCl). The kinetic constant kcat for the catalytic oxidation of Cys was evaluated by chronoamperometry and provided a value of 5.6×10(4) L mol(-1) s(-1). The sensor presents a linear response range from 5.0 up to 200.0 µmol L(-1), detection limit of 8.25 nmol L(-1) and a sensitivity of 120 nA L µmol(-1). 50 202-9