Journal
MATERIALS
Volume 6, Issue 11, Pages 5038-5046Publisher
MDPI AG
DOI: 10.3390/ma6115038
Keywords
lead; detection; DNAzyme; circular dichroism (CD); sensor
Categories
Funding
- National Natural Science Foundation of China [21071066, 91027038, 21101079, 21175034, 21371081, 21301073]
- Key Programs from MOST [2012BAC01B07, 2012AA06A303, 2012BAD29B04, 2012 BAK11B01, 2011BAK10B07, 2011BAK10B01, 2010AA06Z302, 2010DFB3047, 2013ZX08012-001, 2012BAK17B10, 2012BAK08B01, 2012YQ090194, 2012BAD29B05, 2013AA065501]
- Jiangsu Province
- MOF
- MOE [NCET-12-0879, BE2011626, BE2013613, BE2013611, 201310128, 201210127, 201210036, 201310135, 311002, JUSRP51308A]
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A DNAzyme-based sensor for the determination and quantification of lead ions (Pb2+) has been established, which combines the recognition and catalysis of DNAzyme with the optical properties of nanomaterials. Circular dichroism (CD) signals were obtained by a DNAzyme-based assembly of asymmetric silver nanoparticle (AgNPs) dimers. A good linear relationship between CD signals and Pb2+ concentration was obtained ranging from 0.05 ng.mL(-1) to 10 ng.mL(-1) with a limit of detection (LOD) of 0.02 ng.mL(-1). The specificity of this sensor in lead ion detection was excellent, and a satisfactory recovery was obtained in the analysis of tap water samples. The proposed technique possesses both high sensitivity and good specificity, giving it great potential for the analysis of Pb2+ in water.
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