Institute of Quality Standard and Testing Technology for Agro-Products, Sichuan Academy of Agricultural Sciences, Chengdu 610066, China.
College of Chemistry, Sichuan University, No. 29 Wangjiang Road, Chengdu 610064, China.
Molecules. 2023 May 4;28(9):3881. doi: 10.3390/molecules28093881.
The existence of carcinogenic nitrites in food and the natural environment has attracted much attention. Therefore, it is still urgent and necessary to develop nitrite sensors with higher sensitivity and selectivity and expand their applications in daily life to protect human health and environmental safety. Herein, one-dimensional honeycomb-like carbon nanofibers (HCNFs) were synthesized with electrospun technology, and their specific structure enabled controlled growth and highly dispersed bismuth nanoparticles (Bi NPs) on their surface, which endowed the obtained Bi/HCNFs with excellent electrocatalytic activity towards nitrite oxidation. By modifying Bi/HCNFs on the screen-printed electrode, the constructed Bi/HCNFs electrode (Bi/HCNFs-SPE) can be used for nitrite detection in one drop of solution, and exhibits higher sensitivity (1269.9 μA mM cm) in a wide range of 0.1~800 μM with a lower detection limit (19 nM). Impressively, the Bi/HCNFs-SPE has been successfully used for nitrite detection in food and environment samples, and the satisfactory properties and recovery indicate its feasibility for further practical applications.
食品和自然环境中存在致癌亚硝酸盐引起了广泛关注。因此，开发具有更高灵敏度和选择性的亚硝酸盐传感器，并将其应用扩展到日常生活中，以保护人类健康和环境安全仍然是紧迫和必要的。在此，通过静电纺丝技术合成了一维蜂窝状碳纳米纤维（HCNFs），其特殊的结构能够控制铋纳米颗粒（Bi NPs）在其表面的生长和高度分散，从而使所得的 Bi/HCNFs 对亚硝酸盐氧化具有优异的电催化活性。通过在丝网印刷电极上修饰 Bi/HCNFs，构建的 Bi/HCNFs 电极（Bi/HCNFs-SPE）可用于一滴溶液中亚硝酸盐的检测，在 0.1~800 μM 的较宽范围内具有更高的灵敏度（1269.9 μA mM cm），检测限低至 19 nM。令人印象深刻的是，Bi/HCNFs-SPE 已成功用于食品和环境样品中亚硝酸盐的检测，令人满意的性能和回收率表明其具有进一步实际应用的可行性。
