Artículos de revistas
Novel electrochemical sensor for the selective recognition of chlorogenic acid
Registro en:
Analytica Chimica Acta. Elsevier Science Bv, v. 695, n. 41671, n. 44, n. 50, 2011.
0003-2670
WOS:000292357000004
10.1016/j.aca.2011.03.018
Autor
Santos, WDR
Santhiago, M
Yoshida, IVP
Kubota, LT
Institución
Resumen
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) In this study, a novel sensitive molecularly imprinted electrochemical sensor was constructed for the selective detection of chlorogenic acid (CGA) by deposition of a molecularly imprinted siloxane (MIS) film, prepared by sol-gel process, onto Au bare electrode surface. Initially, a (3-mercaptopropyl)siloxane layer (MSL) was formed on the Au bare surface, followed by a siloxane layer obtained from the acid-catalyzed hydrolysis/condensation of a solution constituted by tetraethoxysilane (TEOS), phenyltriethoxysilane (PTEOS), 3-(aminopropyl)trimethoxysilane (APTMS) and CGA, as a molecular template. After the GCA extraction the MIS imprinted film was electrochemically characterized using differential pulse voltammetry (DPV). The MIS/Au sensor was tested in a solution of the CGA template and other similar molecules. This electrode displayed excellent selectivity towards CGA when compared with structurally similar molecules. Under optimized experimental conditions, the peak current response of the sensor for CGA was linear from 5.0 x 10(-7) mol L(-1) to 1.4 x 10(-5) mol L(-1), and the detection limit was 1.48 x 10(-7) mol L(-1). The MIS/Au sensor was successfully applied for the determination of CGA in coffee and tea samples. (C) 2011 Elsevier B.V. All rights reserved. 695 41671 44 50 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)