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Type: Artigo de periódico
Title: Determination of nitrite in food samples by anodic voltammetry using a modified electrode
Author: Santos, WJR
Lima, PR
Tanaka, AA
Tanaka, SMCN
Kubota, LT
Abstract: A glassy carbon (GC) electrode modified with alternated layers of iron(III) tetra-(N-methyl-4-pyridyl)porphyrin (FeT4MPyP) and copper tetrasulfonated phthalocyanine (CuTSPc) was employed for nitrite determination by differential pulse voltammetry (DPV). This modified electrode showed excellent catalytic activity for the nitrite oxidation. After optimizing the operational conditions, a linear response range from 0.5 to 7.5 mu mol l(-1) with a low detection limit of 0.1 mu mol l(-1) was obtained. The proposed sensor was stable with a sensitivity of 20.0 mu A, 1 mu mol(-1) and good repeatability, evaluated in terms of relative standard deviation (R.S.D. = 1.3%) for n = 10. Possible interferences from several common ions were evaluated. This sensor was applied for the voltammetric determination of nitrite in some food samples. The results were consistent with those obtained with the standard spectrophotometric procedure. (C) 2008 Elsevier Ltd. All rights reserved.
Subject: Nitrite
Voltammetric sensor
Country: Inglaterra
Editor: Elsevier Sci Ltd
Citation: Food Chemistry. Elsevier Sci Ltd, v. 113, n. 4, n. 1206, n. 1211, 2009.
Rights: fechado
Identifier DOI: 10.1016/j.foodchem.2008.08.009
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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