Determination of nitrite in food samples by anodic voltammetry using a modified electrode

作者：Santos Wilney J R; Lima Phabyanno R; Tanaka Auro A; Tanaka Sonia M C N; Kubota Lauro T^*

来源：Food Chemistry, 2009, 113(4): 1206-1211.

DOI：10.1016/j.foodchem.2008.08.009

• Nitrite
• FeT4MPyP
• Cu(II)TSPc
• Voltammetric sensor

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.

• 出版日期2009-4-15