Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Ministry of Education, Guilin 541004, China.
Analyst. 2022 May 30;147(11):2369-2377. doi: 10.1039/d2an00549b.
A neodymium metal-organic framework (MOF) was prepared using 1-pyrazole-3,5-dicarboxylic acid (Hpdc) and 2-pyrazinecarboxylic acid as ligands. Through the addition of HAuCl as a precursor and NaBH as a reducing agent, a new MOF-loaded nanogold (AuNPs) (Au@MOF) nanosol with good stability and high catalytic activity was conveniently prepared a solvothermal-reduction method and characterized. It was found that the indicator reaction of reducing HAuCl by NaSO to generate AuNPs was slow. Au@MOF strongly catalyzes this nanoreaction, and the produced AuNPs exhibit a strong resonance Rayleigh scattering (RRS) peak at 370 nm, and a strong surface-enhanced Raman scattering (SERS) peak at 1617 cm with the addition of the molecular probe Victoria blue 4R (VB4r). A novel SERS/RRS di-mode quantitative analysis method for glyphosate (GLY) was established by coupling this new Au@MOF catalytic indicator reaction with the aptamer (Apt) reaction of GLY, with SERS and RRS detection limits of 0.02 nM and 0.3 nM, respectively. It has been applied to the analysis of soil samples with a recovery rate of 93.0%-106.5% and precision of 2.2%-4.1%, and the results were satisfactory.
采用 1-吡唑-3,5-二羧酸（Hpdc）和 2-吡嗪羧酸作为配体，制备了一种钕金属有机骨架（MOF）。通过添加 HAuCl 作为前体和 NaBH 作为还原剂，采用溶剂热还原法方便地制备了一种具有良好稳定性和高催化活性的新型 MOF 负载纳米金（AuNPs）（Au@MOF）纳米溶胶，并对其进行了表征。结果表明，NaSO 将 HAuCl 还原为 AuNPs 的指示反应较慢。Au@MOF 强烈催化此纳米反应，产生的 AuNPs 在加入分子探针维多利亚蓝 4R（VB4r）后在 370nm 处表现出强共振瑞利散射（RRS）峰，在 1617cm 处表现出强表面增强拉曼散射（SERS）峰。通过将这种新的 Au@MOF 催化指示剂反应与草甘膦（GLY）的适体（Apt）反应偶联，建立了一种用于草甘膦（GLY）的新型 SERS/RRS 双模式定量分析方法，SERS 和 RRS 的检测限分别为 0.02nM 和 0.3nM。该方法已应用于土壤样品的分析，回收率为 93.0%-106.5%，精密度为 2.2%-4.1%，结果令人满意。
