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Type: Artigo de periódico
Title: Development of a voltammetric sensor for diospyrin determination in nanomolar concentrations
Author: Costa, CD
Miranda, PRB
Hazra, B
Das Sarma, M
Luz, RDS
Kubota, LT
Goulart, MOF
Abstract: A sensor based on glassy carbon (GC) electrode modified with cobalt tetrasulfonated phthalocyanine, (CoTSPc) and a poly-L-lysine (PLL) film is proposed for diospyrin determination in nanomolar concentrations with differential pulse voltammetry (DPV) technique. The modified electrode showed excellent catalytic activity presenting much higher peak currents than those measured on a bare GC electrode. Linear response range, sensitivity and limit of detection (LOD) were of 1-120 nmol l(-1), 220.46 nA 1 nmol(-1) cm(-2) and 0.3 nmol l(-1), respectively. The repeatability of the proposed sensor, evaluated in term of relative standard deviation (R.S.D.), was measured as 4.4% for 10 experiments in 50 mu mol l(-1) diospyrin samples. The developed sensor was applied for the determination of diospyrin in the crude extracts of the stem-bark of Diospyros montana Roxb. and the average recovery for these samples was 101.9 (+/- 3.1)%. (c) 2005 Elsevier B.V. All rights reserved.
Subject: diospyrin
cobalt tetrasulfonated phthalocyanine
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/j.talanta.2005.08.001
Date Issue: 2006
Appears in Collections:Unicamp - Artigos e Outros Documentos

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