期刊
BIOSENSORS & BIOELECTRONICS
卷 94, 期 -, 页码 358-364出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2017.03.014
关键词
Fe-MOF@mFe(3)O(4)@mC; Core-shell nanostructure; Aptasensor; Detection of heavy metal ion trace
类别
资金
- National Natural Science Foundation of China [131604127, 21471134, 21601161]
- Plan for Scientific Innovation Talent of Henan Province [154200510011]
- Innovative Technology Team of Henan Province
A new core-shell nanostructured composite composed of Fe(III)-based metal organic framework (Fe-MOF) and mesoporous Fe3O4@C nanocapsules (denoted as Fe-MOF@mFe(3)O(4)@mC) was synthesized and developed as a platform for determining trace heavy metal ions in aqueous solution. Herein, the mFe(3)O(4)@mC nanocapsules were prepared by calcining the hollow Fe3O4@C that was obtained using the SiO2 nanoparticles as the template, followed by composing the Fe-MOF. The Fe-MOF@mFe(3)O(4)@mC nanocomposite demonstrated excellent electrochemical activity, water stability and high specific surface area, consequently resulting in the strong biobinding with heavy-metal-ion-targeted aptamer strands. Furthermore, by combining the conformational transition interaction, which is caused by the formation of the G-quadruplex between a single-stranded aptamer and high adsorbed amounts of heavy metal ions, the developed aptasensor exhibited a good linear relationship with the logarithm of heavy metal ion (Pb2+ and As3+) concentration over the broad range from 0.01 to 10.0 nM. The detection limits were estimated to be 2.27 and 6.73 pM toward detecting Pb2+ and As3+, respectively. The proposed aptasensor showed good regenerability, excellent selectivity, and acceptable reproducibility, suggesting promising applications in environment monitoring and biomedical fields.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据