化学
拉曼散射
分子
罗丹明6G
吸附
胶体金
高分子
基质(水族馆)
纳米颗粒
化学工程
拉曼光谱
纳米技术
有机化学
材料科学
海洋学
光学
物理
地质学
工程类
生物化学
作者
Bingyong Lin,Yueliang Wang,Yuanyuan Yao,Lifen Chen,Yanbo Zeng,Lei Li,Zhenyu Lin,Longhua Guo
出处
期刊:Analytical Chemistry
[American Chemical Society]
日期:2021-12-01
卷期号:93 (49): 16727-16733
被引量:11
标识
DOI:10.1021/acs.analchem.1c04797
摘要
Surface-enhanced Raman scattering (SERS) is a super-sensitive analysis technology based on the target molecular fingerprint information. The enhancement of local electromagnetic field of the SERS substrate would increase the target molecules' Raman intensity which adsorb on the surface of nanoparticles. However, the existing adhesive macromolecules in the complex mixed sample would interfere with the adsorption of small target molecules, and it weakens the Raman intensity of target molecules. Microgels are one of the potential materials to suppress the interference of adhesive macromolecules and to avoid the complex pretreatments. However, most of the current microgel synthesis methods involve complex operations with precise instrumentation or the interference of oil and organic reagents. In this work, a simple and oil-free method was proposed to synthesize the gold nanobipyramid (Au NBP)@Ag@hyaluronic acid microgel via the condensation reaction of carboxyl and amino groups. As a proof-of-concept demonstration for small-molecule detection, the rhodamine 6G (R6G) molecules were allowed to enter inside the microgel through the meshes and adsorb on the surface of Au NBP@Ag nanoparticles within 30 min, while the macromolecule (bovine serum albumin in this case) was retained outside the microgel in the meantime. In addition, under the combined action of lightning rod effect of Au NBP and surface plasmon resonance effect of silver render the microgels with high SERS activity. The synthetic Au NBP@Ag@hyaluronic acid microgels were applied to detect 6-thioguanine in the human serum without any pretreatment process, and it showed a high signal enhancement and stable SERS signal, which can satisfy the requirement of clinical diagnosis. These results show that the proposed microgels have potential applications in the field of point-of-care testing.
科研通智能强力驱动
Strongly Powered by AbleSci AI