Giant Catalytic DNA Particles for Simple and Intuitive Detection of Pb2+

Jieun Kim, Jong Bum Lee

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


DNAzymes have been extensively studied as biosensors because of their unique functionality of cleaving substrate in the presence of metal ion cofactors. However, there are only a few reports on visual detection using gold nanoparticles. Here, we synthesized the DNAzyme microparticle (DzMP) (~1 μm) via rolling circle amplification for detection of Pb2+ without the help of other materials. Then, the substrate strands were labeled with two different fluorophores (6-carboxyfluorescein and Cy5) to visualize the DzMPs and to monitor the separation of substrate strands. Because of their large size, the decline in the number of fluorescent particles in the presence of Pb2+ could be successfully demonstrated by a fluorescence microscopy, presenting a new platform for heavy metal detection.

Original languageEnglish
Article number244
Pages (from-to)1-6
Number of pages6
JournalNanoscale Research Letters
Issue number1
StatePublished - 1 Dec 2016


  • Biosensor
  • DNAzyme
  • Heavy metal detection


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