Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/103610
Type: Artigo de periódico
Title: Development Of A Voltammetric Sensor For Catechol In Nanomolar Levels Using A Modified Electrode With Cu(phen)2(tcnq)2 And Pll
Author: de Cassia Silva Luz R.
Damos F.S.
de Oliveira A.B.
Beck J.
Kubota L.T.
Abstract: A sensor based on glassy carbon (GC) electrode modified with bis(1,10-phenantroline)copper(II) bis(tetracyanoquinodimethanide) [Cu(phen)2(TCNQ)2] immobilized in a poly-l-lysine (PLL) film is proposed for catechol (CA) determination with differential pulse voltammetry (DPV) technique. The modified electrode showed excellent stability as well as the ability to detect catechol in nanomolar catechol levels. A linear response range from 10 nmol l-1 up to 20 μmol l-1 with a sensitivity of 2.29 μA l μmol-1 cm-2 and detection limit of 3.0 nmol l-1 were observed in the optimized conditions. The repeatability of the mesurements with the proposed sensor was 2% evaluated in term of relative standard deviation, with n = 10 for 10 μmol l-1 CA. Cyclic voltammetry and rotating disk electrode (RDE) experiments indicated that the catechol oxidation reaction involves two-electrons and a heterogenous rate constant (k) average value of about 1.30 × 103 M-1 s-1. The catechol diffusion coefficient (Do) value was estimated as being 7.6 × 10-6 cm2 s-1. The sensor was successfully applied for CA determination in powdered guarana samples. © 2005 Elsevier B.V. All rights reserved.
Editor: 
Rights: fechado
Identifier DOI: 10.1016/j.snb.2005.11.042
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-33745699651&partnerID=40&md5=d90927987452ef0c617aa2a78c8171b4
Date Issue: 2006
Appears in Collections:Unicamp - Artigos e Outros Documentos

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