Han En, Li Lei, Gao Ting, Pan Yingying, Cai Jianrong
School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, PR China.
School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, PR China.
Food Chem. 2023 Oct 14;437(Pt 1):137773. doi: 10.1016/j.foodchem.2023.137773.
A nanocomposite of multi-walled carbon nanotubes/gold nanoparticles/poly-melamine (MWCNTs/AuNPs/PM) was designed using layer-by-layer self-assembled method on glassy carbon electrode (GCE) by electrochemical deposition to construct an electrochemical sensor for sensitive detection of nitrite. First, a layer of MWCNTs was modified on electrode, and then gold nanoparticles and melamine were in-situ polymerized onto MWCNTs through self-assembled technique to form GCE/MWCNTs/AuNPs/PM. MWCNTs have large specific surface area, which increased the number of gold nanoparticles deposited on MWCNTs. Meanwhile, the doping of gold nanoparticles also improved the polymerization of melamine. The synergistic interaction of nanocomposite further improved the catalytic effect on nitrite. Under optimized conditions, the detection range for nitrite was from 0.4 to 1475 μM and the detection limit was 0.041 μM. Through the detection of nitrite in food samples, the recovery rates were from 93.16% to 108.68%. Therefore, the method can be used as a practical platform for nitrite detection in food.
采用逐层自组装法，通过电化学沉积在玻碳电极（GCE）上设计了一种多壁碳纳米管/金纳米颗粒/聚三聚氰胺（MWCNTs/AuNPs/PM）纳米复合材料，以构建用于灵敏检测亚硝酸盐的电化学传感器。首先，在电极上修饰一层MWCNTs，然后通过自组装技术将金纳米颗粒和三聚氰胺原位聚合到MWCNTs上，形成GCE/MWCNTs/AuNPs/PM。MWCNTs具有较大的比表面积，增加了沉积在MWCNTs上的金纳米颗粒数量。同时，金纳米颗粒的掺杂也促进了三聚氰胺的聚合。纳米复合材料的协同作用进一步提高了对亚硝酸盐的催化效果。在优化条件下，亚硝酸盐的检测范围为0.4至1475 μM，检测限为0.041 μM。通过对食品样品中亚硝酸盐的检测，回收率为93.16%至108.68%。因此，该方法可作为食品中亚硝酸盐检测的实用平台。
