锚固
合理设计
胶体金
纳米技术
DNA
生物传感器
纳米颗粒
核酸
材料科学
组合化学
化学
生物化学
结构工程
工程类
作者
Xin Wang,Zhansen Yang,Yunyi Li,Kunlun Huang,Nan Cheng
标识
DOI:10.1016/j.jcis.2023.11.041
摘要
DNA-functionalized gold nanoparticles (AuNPs), also known as spherical nucleic acids, are widely used in the development of biosensors, resulting in anchoring DNA onto AuNPs being a crucial preparation step and a popular research topic. The latest freeze-anchoring method is a simple and time-saving alternative to traditional salt aging; however, its universal applicability remains limited. In this study, we explored the interfacial interaction between DNA and the AuNP surface and proposed various universal routes for promoting freezing anchoring. Among them, rational design has been considered as the core idea to overcome these limitations, particularly using non-thiolated DNA anchoring, which offers significant advantages such as being unmodified, cost-effective, and easily accessible. We emphasize the importance of sequence structure and preparation process optimization, which mainly considers differences in DNA conformation and electrostatic repulsion. Additionally, the prepared DNA-functionalized AuNPs exhibited complete biological hybridization capability, and the extreme limiting conditions for non-thiolated DNA freeze anchoring were clarified. In summary, this study enhances our understanding of the interfacial relationship between DNA and AuNPs in the freeze-anchoring process and can significantly advance the applications of DNA-functionalized AuNP-based biosensors.
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