A Sensitive and Label-Free Pb(II) Fluorescence Sensor Based on a DNAzyme Controlled G-Quadruplex/Thioflavin T Conformation.

A Sensitive and Label-Free Pb(II) Fluorescence Sensor Based on a DNAzyme Controlled G-Quadruplex/Thioflavin T Conformation.
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基于 DNAzyme 控制的 G-四联体/硫黄素 T 构象的灵敏且无标记的 Pb(II) 荧光传感器

DOI:
10.3390/s16122155
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发表时间:
2016-12-16
期刊:
Sensors (Basel, Switzerland)
影响因子:
--
通讯作者:
Liu G
Liu G
中科院分区:
其他
文献类型:
--
作者:
Wen Y;Wang L;Li L;Xu L;Liu G

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Pb(II) can cause serious damaging effects to human health, and thus, the study of Pb2+ detection methods to sensitively and selectively monitor Pb(II) pollution has significant importance. In this work, we have developed a label-free fluorescence sensing strategy based on a Pb(II) DNAzyme cleavage and the ThT/G-quadruplex complex. In the presence of Pb(II), a G-rich tail was cut and released from the substrate strand, which then would form a G-quadruplex structure by combination with ThT dye. The fluorescence signal increase was then measured for sensitive Pb(II) quantification with a limit of detection of 0.06 nM. Our sensor also demonstrated high selectivity against six different metal ions, which is very important for the analysis of complex samples.
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