表面等离子共振
分子印迹聚合物
黄曲霉毒素
检出限
荧光
聚合物
聚合
等离子体子
表面等离子体子
分析物
纳米颗粒
银纳米粒子
分子印迹
化学
材料科学
分析化学(期刊)
选择性
纳米技术
色谱法
光电子学
有机化学
光学
物理
催化作用
食品科学
作者
Т.А. Sergeyeva,Daria Yarynka,Vitaly Lytvyn,P.V. Demydov,A. M. Lopatynskyi,Yevheniy Stepanenko,О.О. Brovko,Anatoliy O. Pinchuk,Vladimir I. Chegel
出处
期刊:Analyst
[The Royal Society of Chemistry]
日期:2022-01-01
卷期号:147 (6): 1135-1143
被引量:17
摘要
We demonstrate a novel sensor platform with enhanced sensitivity and selectivity for detecting aflatoxin B1 - a common food toxin in cereals. The approach is based on a molecularly imprinted polymer film that provides selective binding of the aflatoxin B1 and fluorescence signal from the analyte molecule enhanced by the local electric field induced in close proximity to the surface of a silver nanoparticle excited at the localized surface plasmon resonance (LSPR) wavelength. Molecularly imprinted polymers (MIPs) with supramolecular aflatoxin-selective receptor sites and embedded spherical silver nanoparticles (with diameters 30-70 nm, the LSPR band 407 nm) were prepared in the form of a thin polymer film on the surface of a glass slide using in situ polymerization. The detection limit of the sensor for aflatoxin B1 is 0.3 ng mL-1, which is significantly lower than for a fluorescent sensor without silver nanoparticles. The plasmon-enhanced fluorescence factor is 33, and the linear dynamic range of the sensor is 0.3-25 ng mL-1.
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