Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/200734
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
Carbon
Cysteine
Electrochemical Techniques
Electrodes
Glass
Gold
Humans
Limit Of Detection
Nanotubes
Nanotubes, Carbon
Chemically Modified Electrodes
Electrocatalysis
Gold Nanorods
Mwcnt
L-cysteine
Rights: fechado
Identifier DOI: 10.1016/j.bios.2013.06.036
Address: http://www.ncbi.nlm.nih.gov/pubmed/23859920
Date Issue: 2013
Appears in Collections:Unicamp - Artigos e Outros Documentos

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