生物传感器
检出限
微分脉冲伏安法
生物素化
化学
胶体金
电极
线性范围
链霉亲和素
电化学
杂交探针
氧化还原
纳米颗粒
循环伏安法
色谱法
组合化学
核化学
DNA
无机化学
纳米技术
生物素
材料科学
生物化学
物理化学
作者
Jihane Mandli,Hasna Mohammadi,Aziz Amine
标识
DOI:10.1016/j.bioelechem.2017.03.002
摘要
In this work, a novel electrochemical biosensor for miRNA-21 determination, involving a sandwich hybridization assay onto gold nanoparticles modified pencil graphite electrode (PGE) and enzyme signal amplification was reported. The thiol terminated capture probe 1 (SH-P1) was immobilized on the electrode through AuS interaction. In the presence of target miRNA-21, SH-P1 hybridized with the first part of the target, however, the second part hybridizes with a biotinylated probe P2 (B-P2). Then, a streptavidin-conjugated alkaline phosphatase was immobilized by a specific binding of avidin-B-P2. The enzyme catalyzed the electro-inactive α-naphtyl phosphate to an electro-active α-naphtol. The miRNA-21 detection was achieved through the changes of α-naphtol oxidation signals observed at +0.12 V vs Ag/AgCl with Differential Pulse Voltammetry. Under the optimal detection conditions, the biosensor exhibited selective and sensitive detection with a linear range from 200 pM to 388 nM and the detection limit was 100 pM (10 fmol in 100 μL).
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