适体
检出限
双金属片
催化作用
化学
组合化学
DNA
电化学
分析物
纳米技术
材料科学
电极
色谱法
分子生物学
生物化学
生物
物理化学
作者
Juncai Zhao,Zhanfang Ma
标识
DOI:10.1016/j.bios.2017.11.044
摘要
Based on the target-induced catalytic hairpin assembly and bimetallic catalyst, the enzyme-free recycling amplification strategy for sensitive detection of prostate specific antigen (PSA) has been designed. The aptamer and its complementary DNA (C-apt) are modified on the magnetic particles. The aptamer-PSA binding event can release the C-apt that triggers the catalytic assembly between hairpin capture DNA and hairpin help DNA. Then the catalytic hairpin assembly leads to cyclic reuse the C-apt and the generation of many opened hairpin capture DNA, which can associate with the prepared Au/Pt-polymethylene blue (PMB) probes to yield electrochemical signal. Meanwhile, the Au/Pt-PMB probes exhibit excellent electrocatalytic ability for H2O2 to magnify the response current. The designed sensor possesses a wide dynamic range of 10 fg mL−1 to 100 ng mL−1 and ultra-low detection limit of 2.3 fg mL−1. The present method has good performance in real serum sample analysis. This strategy is promising to be extended to provide a highly sensitive platform for various target analytes.
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