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Type: Artigo de periódico
Title: A Very Low Potential Electrochemical Detection Of L-cysteine Based On A Glassy Carbon Electrode Modified With Multi-walled Carbon Nanotubes/gold Nanorods.
Author: Silva, Francisco de Assis dos Santos
da Silva, Monique Gabriella Angelo
Lima, Phabyanno Rodrigues
Meneghetti, Mario Roberto
Kubota, Lauro Tatsuo
Goulart, Marilia Oliveira Fonseca
Abstract: 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).
Subject: Biosensing Techniques
Electrochemical Techniques
Limit Of Detection
Nanotubes, Carbon
Chemically Modified Electrodes
Gold Nanorods
Citation: Biosensors & Bioelectronics. v. 50, p. 202-9, 2013-Dec.
Rights: fechado
Identifier DOI: 10.1016/j.bios.2013.06.036
Date Issue: 2013
Appears in Collections:Unicamp - Artigos e Outros Documentos

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