电聚合三聚氰胺用于同时测定亚硝酸盐和柠檬黄。

Electropolymerized melamine for simultaneous determination of nitrite and tartrazine.

机构信息

Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, China.

College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, China.

出版信息

Food Chem. 2020 Dec 15;333:127532. doi: 10.1016/j.foodchem.2020.127532. Epub 2020 Jul 9.

DOI:10.1016/j.foodchem.2020.127532

PMID:32668396

Abstract

Poly(melamine) (PMel) was synthesized via the electropolymerization of melamine monomer, which was then characterized by field-emission scanning electron microscopy (FESEM), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The possible polymerization mechanisms of melamine were also revealed by FT-IR spectroscopy and UV-Vis spectroscopy. Next, the PMel modified GCE (PMel/GCE) was used for the simultaneous determination of nitrite (NO) and tartrazine, and the parameters were optimized. The kinetic study showed that the electrochemical oxidation of nitrite and tartrazine at the surface of PMel/GCE is a typical surface-controlled electrode process. Under the optimun conditions, the developed sensor outperformed those previously reported, and it also exhibited high selectivity and reproducibility. Finally, the PMel/GCE was used for the simultaneous determination of nitrite and tartrazine in foodstuffs, and the results indicated that the proposed sensor could be a promising candidate for accurate determination of nitrite and tartrazine in real food samples.

摘要

聚（三聚氰胺）（PMel）是通过三聚氰胺单体的电聚合合成的，然后通过场发射扫描电子显微镜（FESEM）、循环伏安法（CV）和电化学阻抗谱（EIS）进行了表征。通过傅里叶变换红外光谱（FT-IR）和紫外-可见光谱也揭示了三聚氰胺的可能聚合机制。接下来，将 PMel 修饰的 GCE（PMel/GCE）用于同时测定亚硝酸盐（NO）和酒石黄，并对参数进行了优化。动力学研究表明，在 PMel/GCE 表面上亚硝酸盐和酒石黄的电化学氧化是一种典型的表面控制电极过程。在最佳条件下，所开发的传感器优于以前报道的传感器，并且还表现出高选择性和重现性。最后，将 PMel/GCE 用于食品中亚硝酸盐和酒石黄的同时测定，结果表明，该传感器有望成为准确测定实际食品样品中亚硝酸盐和酒石黄的有前途的候选物。