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Type: Artigo de periódico
Title: Electrochemical sensor based on imprinted sol-gel and nanomaterial for determination of caffeine
Author: Santos, WDR
Santhiago, M
Yoshida, IVP
Kubota, LT
Abstract: The development of a novel sensitive molecularly imprinted electrochemical sensor is described for the detection of caffeine. The sensor was prepared onto a glassy carbon electrode modified with multiwall carbon nanotubes (MWCNTs)/vinyltrimethoxysilane (VTMS) recovered by a molecularly imprinted siloxane (MIS) film prepared by sol-gel process. MWCNTs/VTMS was produced by a simple grafting of VTMS on MWCNTs surface by in situ free radical polymerization. The siloxane layer was obtained from the acid-catalyzed hydrolysis/condensation of a solution constituted by tetraethoxysilane (TEOS), methytrimethoxysilane (MTMS), 3-(aminopropyl)trimethoxysilane (APTMS) and caffeine, as a template molecule. The morphology and performance of the imprinted siloxane film was characterized by scanning electron microscopy (SEM) and differential pulse voltammetry (DPV). The MIS/MWCNTs-VTMS/GCE sensor was tested in a solution of the caffeine and other similar molecules. After optimization of the experimental conditions, the sensor showed a linear response range from 0.75 to 40 mu mol L-1, with a detection limit (LOD) of 0.22 mu mol L-1. The imprinted sensor was successfully tested to detect caffeine in real samples. (C) 2012 Elsevier B.V. All rights reserved.
Subject: Electrochemical sensor
Molecular imprinting siloxane
Country: Suíça
Editor: Elsevier Science Sa
Citation: Sensors And Actuators B-chemical. Elsevier Science Sa, v. 166, n. 739, n. 745, 2012.
Rights: fechado
Identifier DOI: 10.1016/j.snb.2012.03.051
Date Issue: 2012
Appears in Collections:Unicamp - Artigos e Outros Documentos

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