拉曼散射
葡萄糖氧化酶
胶体金
纳米技术
拉曼光谱
纳米颗粒
化学
生物传感器
材料科学
组合化学
光学
物理
作者
Yihui Hu,Hanjun Cheng,Xiaozhi Zhao,Jiangjiexing Wu,Faheem Muhammad,Shichao Lin,Jian He,Liqi Zhou,Chengping Zhang,Yu Deng,Peng Wang,Zhengyang Zhou,Shuming Nie,Hui Wei
出处
期刊:ACS Nano
[American Chemical Society]
日期:2017-05-26
卷期号:11 (6): 5558-5566
被引量:557
标识
DOI:10.1021/acsnano.7b00905
摘要
Gold nanoparticles (AuNPs) with simultaneous plasmonic and biocatalytic properties provide a promising approach to developing versatile bioassays. However, the combination of AuNPs' intrinsic enzyme-mimicking properties with their surface-enhanced Raman scattering (SERS) activities has yet to be explored. Here we designed a peroxidase-mimicking nanozyme by in situ growing AuNPs into a highly porous and thermally stable metal–organic framework called MIL-101. The obtained AuNPs@MIL-101 nanozymes acted as peroxidase mimics to oxidize Raman-inactive reporter leucomalachite green into the active malachite green (MG) with hydrogen peroxide and simultaneously as the SERS substrates to enhance the Raman signals of the as-produced MG. We then assembled glucose oxidase (GOx) and lactate oxidase (LOx) onto AuNPs@MIL-101 to form AuNPs@MIL-101@GOx and AuNPs@MIL-101@LOx integrative nanozymes for in vitro detection of glucose and lactate via SERS. Moreover, the integrative nanozymes were further explored for monitoring the change of glucose and lactate in living brains, which are associated with ischemic stroke. The integrative nanozymes were then used to evaluate the therapeutic efficacy of potential drugs (such as astaxanthin for alleviating cerebral ischemic injuries) in living rats. They were also employed to determine glucose and lactate metabolism in tumors. This study not only demonstrated the great promise of combining AuNPs' multiple functionalities for versatile bioassays but also provided an interesting approach to designing nanozymes for biomedical and catalytic applications.
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