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Improving efficiency of entropy-driven DNA amplification biosensing through producing two label-free signal strands in one cycle

生物传感器 化学 检出限 环介导等温扩增 熵(时间箭头) DNA 信号(编程语言) 核酸 组合化学 生物系统 色谱法 生物化学 计算机科学 物理 生物 量子力学 程序设计语言
作者
Qiang Liu,Lin Hou,Yuyuan Zhang,Mei Liu,Yan Jin,Baoxin Li
出处
期刊:Analytica Chimica Acta [Elsevier BV]
卷期号:1232: 340484-340484 被引量:3
标识
DOI:10.1016/j.aca.2022.340484
摘要

Entropy-driven circuits (EDC) provides one isothermal and non-enzymatic signal amplification strategy. But the efficiency of EDC signal amplification is not enough high because only one single strand can be produced in each cycle of the typical EDC system. In this work, we proposed one strategy to improve the amplification efficiency of EDC-based biosensing. In this strategy, two signal strands were produced in one cycle. The G-triplex (G3)-forming sequence was used as signal strand, and the G3/thioflavin T (G3/ThT) was used as label-free fluorescence reporter in this EDC-based biosensing. The detection limit of this method was estimated to be 3.4 pM for target DNA, which was about 10 times lower than that of the conventional EDC method. Furthermore, the response time was shortened from more than 1 h–0.5 h. In a word, one enzyme-free and label-free EDC strategy was proposed to construct an efficient nucleic acid biosensing platform. Two label-free signal probes are produced in one cycle to significantly improve the efficiency of entropy-driven DNA amplification biosensing. • A simple strategy was proposed to improve the efficiency of entropy-driven DNA amplification biosensing. • The fluorescence strategy shows high sensitivity. • This method is enzyme-free and label-free. • This detection procedure can be finished within 30 min.
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