College of Food Science, Southwest University, Chongqing, 400716, China.
Institute of Environment and Safety, Wuhan Academy of Agricultural Science, Wuhan, 430207, China.
Mikrochim Acta. 2021 Apr 15;188(5):165. doi: 10.1007/s00604-021-04811-3.
The construction of multifunctional sensors has attracted considerable attention due to their multifunctional properties, such as high sensitivity and rapid detection. Herein, near-infrared multifunctional fluorescent sensing materials based on core-shell upconversion nanoparticle@magnetic nanoparticle and molecularly imprinted polymers were synthesized for rapid detection of deltamethrin. The difunctional core-shell upconversion nanoparticle@magnetic nanoparticle was introduced as the optical signal and rapid separator. Firstly, the difunctional core-shell materials were prepared through solvothermal method. Then, molecularly imprinted polymers (MIPs) as recognition elements for deltamethrin were coated on the surface of upconversion nanoparticle@magnetic nanoparticle through polymerization. The structure and recognition characterizations of multifunctional fluorescent sensing materials were evaluated. Under optimal condition, the imprinting factor of sensing materials was 3.63, and the fluorescence intensity of sensing materials decreased linearly with increasing concentration of deltamethrin from 0.001 to 1 mg L with a detection limit of 0.749 μg L, and a relative standard deviation of 3.10% was obtained with 5 mg L deltamethrin. The sensing materials showed a high selectivity and were successfully utilized for the detection of deltamethrin in grapes and cabbages; the results showed that the recoveries for two samples obtained were 95.6-102% and 91.8-105%.
由于多功能传感器具有高灵敏度和快速检测等多功能特性，因此引起了相当大的关注。本文合成了基于核壳上转换纳米粒子@磁性纳米粒子和分子印迹聚合物的近红外多功能荧光传感材料，用于快速检测氯菊酯。将双功能核壳上转换纳米粒子@磁性纳米粒子用作光学信号和快速分离器。首先，通过溶剂热法制备双功能核壳材料。然后，通过聚合将用于氯菊酯的分子印迹聚合物（MIP）涂覆在上转换纳米粒子@磁性纳米粒子的表面上。评估了多功能荧光传感材料的结构和识别特性。在最佳条件下，传感材料的印迹因子为 3.63，并且传感材料的荧光强度随氯菊酯浓度从 0.001 至 1 mg L 的线性降低，检测限为 0.749μg L，并且在 5 mg L 氯菊酯下获得了 3.10％的相对标准偏差。传感材料表现出高选择性，并成功用于葡萄和白菜中氯菊酯的检测；结果表明，两种样品的回收率分别为 95.6-102％和 91.8-105％。
