Detection of trace Hg2+ via induced circular dichroism of DNA wrapped around single-walled carbon nanotubes

Xueyun Gao, Gengmei Xing, Yanlian Yang, Xiaoli Shi, Ru Liu, Weiguo Chu, Long Jing, Feng Zhao, Chang Ye, Hui Yuan, Xiaohong Fang, Chen Wang, Yuliang Zhao

Research output: Contribution to journalArticle

96 Scopus citations

Abstract

The strongly induced circular dichroism (ICD) signals of DNA wrapped around single-walled carbon nanotubes (SWCNTs) 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 nM level.

Original languageEnglish (US)
Pages (from-to)9190-9191
Number of pages2
JournalJournal of the American Chemical Society
Volume130
Issue number29
DOIs
StatePublished - Jul 23 2008

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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