Title of Paper:DNA-modified graphene quantum dots as a sensing platform for detection of Hg2+ in living cells

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Date of Publication:2015-01-01

Journal:RSC ADVANCES

Included Journals:SCIE、EI、Scopus

Volume:5

Issue:49

Page Number:39587-39591

ISSN No.:2046-2069

Abstract:Detection of metal ions in living cells is significant in environmental monitoring and health risk assessment. This paper reports a simple and facile method for the detection of Hg2+ ions in Hela cells through fluorescence imaging, which was based on the fluorescence quenching in thymine-rich DNA modified graphene quantum dots (DNA-GQDs) in the presence of Hg2+. The decrease in the fluorescence intensity was attributed to the electron transfer of DNA-GQDs due to Hg2+ bound to the thymine bases of the DNA, resulting in a T-T mismatch hairpin structure. The method shows high selectivity and sensitivity. This present sensing platform will have broad applications in biological imaging and environmental monitoring.