Shu Yiyi, Li Jingjing, Bai Hongyan, Liang Aihui, Wen Guiqing, Jiang Zhiliang
State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin, 541004, China; Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin, 541006, China.
State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin, 541004, China; Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin, 541006, China.
Talanta. 2024 Jan 15;267:125166. doi: 10.1016/j.talanta.2023.125166. Epub 2023 Sep 13.
New multifunctional nanomaterial preparation and its application to trace pollutant analysis are interesting to peoples. Using terbium metal-organic framework loaded gold nanoparticles (MOF@Au) as the nanosubstrate and 3-aminopropyltriethoxysilane (APTES) as the functional monomer, a new bifunctional nanosurface molecularly imprinted polymer nanoprobe of MOF@Au@MIP with strongly recognition and catalytic amplification functions was prepared by the microwave sol-gel procedure. It was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier infrared spectroscopy (FTIR) and other techniques. The nanoprobe was found to specifically recognize malathion (MAL) and catalyze the L-cysteine (Cys)-HAuCl nanogold indicator reaction to amplify the molecular spectral signal. The gold nanoparticles (AuNPs) generated in the system show a strong surface-enhanced Raman scattering (SERS) effect, resonant Rayleigh scattering (RRS) peak and UV absorption (Abs) peak at 1615 cm, 370 nm and 520 nm, respectively. Based on this, a new SERS/RRS/Abs trimode method for the detection of MAL can be established. It has been applied to the analysis of cereal samples with satisfactory recoveries of 95.2-107.4% and precision of 3.76-9.06%.
新型多功能纳米材料的制备及其在痕量污染物分析中的应用引起了人们的兴趣。以负载金纳米粒子的铽基金属有机框架（MOF@Au）为纳米底物，3-氨丙基三乙氧基硅烷（APTES）为功能单体，通过微波溶胶-凝胶法制备了一种具有强识别和催化放大功能的新型双功能纳米表面分子印迹聚合物纳米探针MOF@Au@MIP。通过扫描电子显微镜（SEM）、X射线衍射（XRD）和傅里叶红外光谱（FTIR）等技术对其进行了表征。发现该纳米探针能特异性识别马拉硫磷（MAL），并催化L-半胱氨酸（Cys）-HAuCl纳米金指示剂反应以放大分子光谱信号。体系中生成的金纳米粒子（AuNPs）分别在1615 cm、370 nm和520 nm处呈现出强烈的表面增强拉曼散射（SERS）效应、共振瑞利散射（RRS）峰和紫外吸收（Abs）峰。基于此，可建立一种检测MAL的新型SERS/RRS/Abs三模态方法。该方法已应用于谷物样品分析，回收率为95.2 - 107.4%，精密度为3.76 - 9.06%，结果令人满意。
