期刊
ANALYST
卷 144, 期 5, 页码 1671-1678出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8an01971a
关键词
-
资金
- National Natural Science Foundation of China [U1504215, 21576071, 21776061]
- International Science and Technology Cooperative Project - Department of Science and Technology of Henan Province [172102410042]
- program for Science & Technology Innovation Talents in Universities of Henan Province [19HASTIT037]
- program for Science & Technology Innovation Team in Universities of Henan Province [19IRTSTHN029]
In this work, a sensitive and selective electrochemical aptasensor for determination of microcystin-LR (MC-LR) was developed based on a dual signal amplification system consisting of a novel ternary composite and horseradish peroxidase (HRP). The ternary composite was prepared by depositing gold nanoparticles (AuNPs) on molybdenum disulfide (MoS2) covered TiO2 nanobeads (TiONBs). MoS2 nanosheet modified TiONBs provided a large surface area for immobilization of AuNPs and biomolecules. The ternary composite also possesses an improved electron transfer and catalytic capability. To construct the aptasensor, thiolated MC-LR aptamers were immobilized on the AuNP@MoS2-TiONB modified electrode through a gold-sulfur bond. Then, biotin-cDNA with a sequence complementary to the MC-LR aptamer competed with MC-LR for binding to the immobilized aptamer. The current signal catalyzed by avidin-HRP decreased with the increase of MC-LR, based on which a linear range of 0.005-30 nM and a detection limit of 0.002 nM were obtained.
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