Tu Xiaoyan, Yuan Jiajia, Xu Shuxia, Zhang Xinfeng
State Key Lab of Geohazard prevention & Geoenvironment protection, College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China.
College of Ecology and Environment, Chengdu University of Technology, Chengdu 610059, China.
J Hazard Mater. 2025 Jan 15;482:136519. doi: 10.1016/j.jhazmat.2024.136519. Epub 2024 Nov 15.
The monitoring of glyphosate residue in environmental samples is critically important due to its high environmental risk. Here, we reported a low background dual-ligand and fast response copper-based metal organic framework (Cu-MOF) nanoprobe for imaging glyphosate in plant tissue, rapid screening of glyphosate-contaminated samples, and sensitive detection of glyphosate in environmental samples. The Cu-MOF nanoprobe was prepared with 2-Aminoisophthalic Acid (AIA) and trimesic acid (HBTC) as ligands, and Cu as a metal node. Thanking to both ligand-to-metal charge transfer (LMCT) and photoinduced electron transfer (PET) effects, the fluorescence of ligand AIA could be fully quenched in Cu-AIA/BTC probe. Upon the addition of glyphosate, it competed with the ligands in Cu-AIA/BTC probe, causing the collapse of MOF structure and the release of ligand AIA with obvious fluorescence recovery. This nanoprobe exhibited a desirable linear response for glyphosate in the concentration range of 0.1-80 μM, with a low detection limit of 33 nM, much lower than the maximum contaminant level (4.1 μM) set by the U.S. Environmental Protection Agency (EPA). Furthermore, it was also successfully applied for plant tissue imaging, fast screening of glyphosate-contaminated samples and monitoring of the degradation of glyphosate on tea leaves and in soil, indicating the broad application prospect of the nanoprobe.
由于草甘膦具有较高的环境风险，因此监测环境样品中的草甘膦残留至关重要。在此，我们报道了一种低背景双配体且响应快速的铜基金属有机框架（Cu-MOF）纳米探针，用于植物组织中草甘膦的成像、草甘膦污染样品的快速筛选以及环境样品中草甘膦的灵敏检测。该Cu-MOF纳米探针以2-氨基间苯二甲酸（AIA）和均苯三甲酸（HBTC）作为配体，以Cu作为金属节点制备而成。得益于配体到金属的电荷转移（LMCT）和光致电子转移（PET）效应，配体AIA的荧光在Cu-AIA/BTC探针中可被完全淬灭。加入草甘膦后，它与Cu-AIA/BTC探针中的配体竞争，导致MOF结构坍塌，配体AIA释放，荧光明显恢复。该纳米探针对草甘膦在0.1 - 80 μM浓度范围内表现出理想的线性响应，检测限低至33 nM，远低于美国环境保护局（EPA）设定的最大污染物水平（4.1 μM）。此外，它还成功应用于植物组织成像、草甘膦污染样品的快速筛选以及茶叶和土壤中草甘膦降解的监测，表明该纳米探针具有广阔的应用前景。
