期刊
FOOD CHEMISTRY
卷 113, 期 4, 页码 1206-1211出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2008.08.009
关键词
Nitrite; FeT4MPyP; Cu(II)TSPc; Voltammetric sensor
资金
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
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.
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