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Surface-enhanced Raman spectroscopic-based aptasensor for Shigella sonnei using a dual-functional metal complex-ligated gold nanoparticles dimer.
Colloids and Surfaces B: Biointerfaces ( IF 5.4 ) Pub Date : 2020-03-04 , DOI: 10.1016/j.colsurfb.2020.110940
Shijia Wu 1 , Nuo Duan 1 , Chuxian He 2 , Qianru Yu 2 , Shaoliang Dai 3 , Zhouping Wang 1
Affiliation  

Herein, we constructed an aptamer-based sensor for the sensitive and highly specific detection of Shigella sonnei via surface enhanced Raman spectroscopy (SERS) analysis. A composite material integrated of the Raman active 4-MBA ligand of the Eu-complex and citrate-stabilized Au nanoparticles (cit-Au NPs) was synthesized and served as both active substrate and Raman reporter. Aptamers targeted to S. Sonnei was then modified onto the surface of this dual-functional material. With the introduction of S. Sonnei, aptamer bound with target with high affinity and specificity, leaving the dual-functional material onto the bacteria. The SERS intensity response showed a strong positive linear correlation (R = 0.9956) with increasing concentrations of S. sonnei (ranging from 10 to 106 cfu/mL). High specificity was achieved at Shigella species (S. dysenteriae, S. flexneri, S. boydii) and other common bacteria (Salmonella typhimurium, Staphylococcus aureus and Escherichia coli). When applied in real samples, the approach showed recoveries from 92.6 to 103.8 %. The designed approach holds great potential for the construction of various aptasensors for the effective and convenient detection of different food hazards.

中文翻译:

使用双功能金属络合物连接的金纳米颗粒二聚体的表面增强拉曼光谱基适体传感器。

在这里,我们构建了一个基于适体的传感器,用于通过表面增强拉曼光谱(SERS)分析对索氏志贺氏菌进行灵敏且高度特异性的检测。合成了由Eu-络合物的拉曼活性4-MBA配体和柠檬酸盐稳定的Au纳米颗粒(cit-Au NPs)集成而成的复合材料,可作为活性底物和拉曼报告分子。然后将针对S. Sonnei的适体修饰到这种双功能材料的表面上。随着S. Sonnei的引入,适体以高亲和力和特异性与靶标结合,从而将双功能材料留在细菌上。SERS强度响应显示出随着索氏链球菌浓度的增加(范围为10至106 cfu / mL)的强正线性相关性(R = 0.9956)。在志贺氏菌属物种中获得了高特异性(S. 痢疾杆菌,弗氏链球菌,博伊氏链球菌)和其他常见细菌(鼠伤寒沙门氏菌,金黄色葡萄球菌和大肠杆菌)。当应用于实际样品时,该方法的回收率从92.6%增至103.8%。设计的方法在构建各种适体传感器方面具有巨大潜力,可以有效,方便地检测出各种食品危害。
更新日期:2020-03-04
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