A molecularly imprinted ratio fluorescence sensor based on metal-enhanced fluorescence of core-shell structure CaF2-silver nanoparticle for visual detection of dicamba

被引:0
作者
Xu, Jing [1 ]
Wu, Jiechun [1 ]
Li, Songlian [1 ]
Yan, Zhihong [1 ]
Zhou, Qing [1 ]
Li, Kang [1 ]
机构
[1] Guangdong Pharmaceut Univ, Sch Pharm, Guangzhou 510006, Peoples R China
基金
中国国家自然科学基金;
关键词
Metal-enhanced fluorescence; Core-shell structure CaF2-Ag nanoparticle; Molecular imprinted polymers; Ratio fluorescent sensor; Dicamba; CDTE QUANTUM DOTS; CONFIRMATION; POLYMERS; HPLC;
D O I
10.1007/s00216-024-05715-w
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
Although fluorescence analysis methods are widely used in pesticide residue detection, improving their sensitivity and selectivity remains a challenge. This paper presents a novel ratio fluorescence sensor based on the molecular imprinting polymers (MIPs) and metal-enhanced fluorescence for visual detection of dicamba (DIC). Calcium fluoride (CaF2) quantum dots (QDs) were immobilized on the surface of Ag@MIPs, resulting in a blue fluorescence response signal (Ag@MIPs-CaF2). The MIPs shell, which possesses a specific recognition capability, serves as an isolation layer to adjust the distance between Ag nanoparticles and CaF2 QDs for enhancing the fluorescence of CaF2 QDs by up to 7.1 times under optimal conditions. In the presence of DIC, the blue fluorescence was selectively quenched, while the reference signal red fluorescence from cadmium telluride QDs coated with silicon dioxide (CdTe@SiO2) remained relatively stable, resulting in a color change from blue to red. The sensor had a detection limit of 0.16 mu M for DIC in the range of 1.0 to 50.0 mu M, recovery rates of 85.4 to 103.5% for actual samples, and an imprinting factor of 3.28. The 3D finite-difference time-domain simulation revealed that the fluorescence enhancement was due to the local electric field amplification. Therefore, the developed sensing system in this work offers a broad application prospect for visual detection of DIC in food samples.
引用
收藏
页码:1139 / 1152
页数:14
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