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合Aptamer的核心外磁性纳米粒子,用于快速和特定地分离阴性细菌

Rakshya Panta¹, Chao Lu², Howyn Tang¹

¹School of Biomedical Engineering, University of Western Ontario London Ontario N6A 5B9 Canada jzhang@eng.uwo.ca.

|November 3, 2025

概括

在几分钟内,Aptamer结合的磁纳米粒子迅速从水中捕获大肠杆菌 (E. coli). 这种磁隔离方法为水质监测和公共卫生保护提供了快速解决方案.

科学领域:

纳米技术纳米技术
环境科学环境科学
微生物学微生物学

背景情况:

快速检测和从水中去除像大肠杆菌 (E. coli) 这样的阴性细菌对于公众健康和环境安全至关重要.
目前用于细菌分离的方法可能耗时,需要更快,更有效的技术.

研究的目的:

开发和演示aptamer结合的核心外磁性纳米粒子 (MNPs),用于从水溶液中快速捕获大肠杆菌DH5α.
在细菌隔离中评估这些功能化的MNP的效率和选择性.

主要方法:

核心外MNP与氧化铁 (Fe3O4) 核心和二氧化 (SiO2) 的合成.
在Fe3O4@SiO2纳米颗粒上生物结合阿普坦,使用甲.
在2.0kOe磁场下使用1mgmL-1的Aptamer-Fe3O4@SiO2纳米颗粒对大肠杆菌DH5α进行磁性分离.

主要成果:

在仅仅5分钟的时间里,Aptamer-Fe3O4@SiO2纳米粒子成功地从水中捕获了大肠杆菌DH5α细胞 (1 × 10^7 CFU mL^−1).
这些纳米颗粒与其他大肠杆菌菌株和格拉姆阳性细菌相比,与大肠杆菌DH5α进行了选择性相互作用.
Fe3O4核心的直径为~16nm,SiO2外厚度为~24nm.

结论:

对Fe3O4@SiO2 MNPs的aptamer结合为快速磁性隔离和检测大肠杆菌提供了一个强大的平台.
这项技术具有实时监测水质和保护公共健康的巨大潜力.
开发的方法提供了一种有效的细菌去除方法,有助于环境可持续性.

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