Detection of trace Hg2+ via induced circular dichroism of DNA wrapped around single-walled carbon nanotubes
Detection of trace Hg2+ via induced circular dichroism of DNA wrapped around single-walled carbon nanotubes
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DOI：
10.1021/ja801793k
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发表时间：
2008-07-23
影响因子：
15
通讯作者：
Zhao, Yuliang
中科院分区：
文献类型：
--
作者：
Gao, Xueyun;Xing, Gengmei;Zhao, Yuliang
用同步辐射装置显示了包裹在单壁碳纳米管I上的DNA的强诱导圆二色性（ICD）信号。在溶液中，痕量的Hg离子具有强亲和力，通过伪一级动力学反应结合DNA-SWCNT的核酸碱基。汞与DNA碱基的结合导致部分DNA从单壁碳纳米管解离。DNA与单壁碳纳米管的这种解离将降低DNA与单壁碳纳米管之间跃迁偶极矩的耦合效应，从而导致DNA-单壁碳纳米管的ICD信号显着降低。在此，将DNA-SWCNTs的ICD应用于检测Hg离子的浓度。
The strongly induced circular dichroism (ICD) signals of DNA wrapped around single-walled carbon nanotubes I are shown by the Synchrotron Radiation Facility. In solution, trace amounts of Hg ions have a strong affinity to bind the nucleic bases of DNA-SWCNTs via a pseudo-first-order kinetic reaction. The Hg binding to the bases of DNA results in partial DNA disassociation from the SWCNTs. Such disassociation of DNA from the SWCNTs will decrease the coupling effects of the transition dipole moments between DNA and SWCNTs, thus inducing the ICD signal of DNA-SWCNTs to decrease significantly. Herein, the ICD of DNA-SWCNTs is applied to detect the concentration of Hg ions at.