Ultrasensitive detection of lead ion based on target induced assembly of DNAzyme modified gold nanoparticle and graphene oxide |
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Authors: | Chao Li Luming Wei Xinjian Liu Lin Lei Genxi Li |
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Institution: | 1. Department of Biochemistry and State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing 210093, PR China;2. Laboratory of Biosensing Technology, School of Life Sciences, Shanghai University, Shanghai 200444, PR China |
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Abstract: | In this paper, we report a novel colorimetric strategy for the detection of small molecules by using Pb2+ ion as an example. In this strategy, DNAzyme duplex modified gold nanoparticles (GNPs) are designed to be unable to interact with graphene oxide (GO). However, in the presence of Pb2+, the substrate strand of the DNAzyme is cleaved at its cleavage site, resulting in the disassembly of the DNAzyme duplex modified GNPs into three parts, i.e., the 3′- and 5′-fragments of substrate strand and the DNAzyme strand modified GNPs. By taking advantage of the efficient cross-linking effect of ssDNA-GNPs to GO, colorimetric sensor for the detection of the metal ion can be fabricated with a detection limit of 100 pM, which is much lower than the previous reports. This colorimetric method has also been used for the determination of Pb2+ in the tap water of the local city and the water from a reservoir with satisfactory results, so it may have potential applications in the future. |
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Keywords: | Colorimetric detection DNAzyme Gold nanoparticle Graphene oxide Lead ion |
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