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Detection of Metal Ions (Cu2+, Hg2+) and Cocaine by Using Ligation DNAzyme Machinery.
- Source :
-
Chemistry - A European Journal . Dec2012, Vol. 18 Issue 50, p16030-16036. 7p. - Publication Year :
- 2012
-
Abstract
- The Cu2+-dependent ligation DNAzyme is implemented as a biocatalyst for the colorimetric or chemiluminescence detection of Cu2+ ions, Hg2+ ions, or cocaine. These sensing platforms are based on the structural tailoring of the sequence of the Cu2+-dependent ligation DNAzyme for specific analytes. The tethering of a subunit of the hemin/G-quadruplex DNAzyme to the ligation DNAzyme sequence, and the incorporation of an imidazole-functionalized nucleic-acid sequence, which acts as a co-substrate for the ligation DNAzyme that is tethered to the complementary hemin/G-quadruplex subunit. In the presence of different analytes, Cu2+ ions, Hg2+ ions, or cocaine, the pretailored Cu2+-dependent ligation DNAzyme sequence stimulates the respective ligation process by combining the imidazole-functionalized co-substrate with the ligation DNAzyme sequence. These reactions lead to the self-assembly of stable hemin/G-quadruplex DNAzyme nanostructures that enable the colorimetric analysis of the substrate through the DNAzyme-catalyzed oxidation of 2,2′-azinobis(3-ethylbenzothiazoline-6-sulfonic acid), ABTS2−, by H2O2 into the colored product ABTS.−, or the chemiluminescence detection of the substrate through the DNAzyme-catalyzed oxidation of luminol by H2O2. The detection limits for the sensing of Cu2+ ions, Hg2+ ions, and cocaine correspond to 1 n M, 10 n M and 2.5 μ M, respectively. These different sensing platforms also reveal impressive selectivities. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09476539
- Volume :
- 18
- Issue :
- 50
- Database :
- Academic Search Index
- Journal :
- Chemistry - A European Journal
- Publication Type :
- Academic Journal
- Accession number :
- 83836719
- Full Text :
- https://doi.org/10.1002/chem.201201479