双金属
荧光
化学
双金属片
碳纤维
比表面积
金属有机骨架
检出限
纳米颗粒
化学工程
催化作用
吸附
材料科学
纳米技术
有机化学
色谱法
物理化学
工程类
复合材料
物理
复合数
量子力学
作者
Mengting Chen,Xiaomeng Huang,Yuxuan Chen,Yiran Cao,Shengsen Zhang,Hongtao Lei,Weipeng Liu,Yingju Liu
标识
DOI:10.1016/j.jhazmat.2022.130233
摘要
Ochratoxin A (OTA), which has strong hepatotoxicity and nephrotoxicity, can accumulate in the human body through the food chain; thus, the selective and effective detection of OTA is urgently required for food security. Nanozymes with hyperfine size and shape control have attracted attention because of their controllable structure and intrinsic activity. Herein, CuFe-bimetal coordinated N-doped carbon ([email protected]) with morphology-driven peroxidase-mimicking activity was synthesized using Cu2O with specific polygonal cubes and fully exposed {111} crystalline facets as the template to produce a CuFe-bimetallic metal organic framework (MOF) and further treating CuFe-MOF with high-temperature pyrolysis. N-doping can confer electronegativity to exhibit high affinity, while the large surface area of the porous carbon support can facilitate rapid adsorption-desorption equilibrium. Using the peroxidase-mimicking [email protected]0.5-NC as a carrier, a versatile immunoassay for the detection of OTA was implemented based on the ratiometric fluorescence and the localized surface plasmon resonance peak shift, achieving a detection limit of 0.52 ng/L in the range of 0.001–10 μg/L. Therefore, the strategy of enhancing enzyme-mimicking activity using specific shapes and crystalline facets may open new avenues for food and environmental analysis.
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