镍
拉曼光谱
表面增强拉曼光谱
材料科学
纳米颗粒
表面等离子共振
检出限
银纳米粒子
核化学
分析化学(期刊)
化学工程
化学
纳米技术
色谱法
冶金
拉曼散射
光学
物理
工程类
作者
Kun Ge,Yuling Hu,Gongke Li
标识
DOI:10.1016/j.snb.2022.132842
摘要
Herein, Ag nanoparticles decorated MOF-74 (Ni) encapsulated magnetic prickly-like nickel rods ([email protected] (Ni)/Ag) was firstly designed and fabricated for simultaneous surface-enhanced Raman spectroscopy (SERS) analysis of mycotoxins in food samples. The prickly-like NiRs not only provide magnetism with anisotropy structure, but also directly supply Ni2+ for surface initiated encapsulation of MOF-74 (Ni) on NiRs. The as-fabricated [email protected] (Ni)/Ag exhibits good SERS activity due to the enrichment effect of magnetic NiRs, adsorption of MOF-74 (Ni) and localized surface plasmon resonance properties of AgNPs. The enhancement factor for 5,5′-dithiobis-(2-nitrobenzoic acid) and 4-mercaptobenzoic acid can reach 108 level with limits of detection (LOD) of 1.0 ng/L. Subsequently, the magnetic aptamer probes based on [email protected] (Ni)/Ag were fabricated for simultaneous, sensitive and selective SERS analysis of T-2 and deoxynivalenol in food samples. The method exhibited satisfactory linearity in range of 0.5–750.0 μg/L and 0.3–750.0 μg/L with LOD of 0.15 and 0.08 μg/L for T-2 and deoxynivalenol, respectively. The relative errors between the developed method and standard HPLC-MS ranged from −7.7 to 1.4%. Our results open a new venue in design and fabrication of magnetic SERS substrates with unique property for quantification of multiple mycotoxins in complex samples.
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