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Unimolecular Catalytic DNA Biosensor for Amplified Detection of <scp>l</scp>-Histidine via an Enzymatic Recycling Cleavage Strategy
- Source :
- Analytical Chemistry. 83:7603-7607
- Publication Year :
- 2011
- Publisher :
- American Chemical Society (ACS), 2011.
-
Abstract
- Fluorescence catalytic beacons have emerged as a general platform for sensing applications. However, almost all such sensing systems need covalent modification of the DNAzymes with fluorophore-quencher pairs, which may require elaborate design of the synthetic routes and many heavy and complicated synthetic steps and result in increased cost and lower synthesis yield. Here we report the construction of fluorescent cascadic catalytic beacons. With separation of the molecular recognition module from the signal reporter, this new design both avoids DNAzyme modifications and improves sensitivity through an endonuclease-based cascadic enzymatic signal amplification. This allows detection of L-histidine with high sensitivity (LOD = 200 nM) and excellent specificity. The proposed sensing system has also been used for detection of L-histidine in cellular homogenate with satisfactory results.
- Subjects :
- biology
Chemistry
Deoxyribozyme
Nucleic Acid Hybridization
Biosensing Techniques
DNA, Catalytic
Cleavage (embryo)
Combinatorial chemistry
Fluorescence
Catalysis
Analytical Chemistry
Endonuclease
chemistry.chemical_compound
Molecular recognition
Biochemistry
biology.protein
Histidine
Nucleic Acid Amplification Techniques
Biosensor
DNA
Fluorescent Dyes
Subjects
Details
- ISSN :
- 15206882 and 00032700
- Volume :
- 83
- Database :
- OpenAIRE
- Journal :
- Analytical Chemistry
- Accession number :
- edsair.doi.dedup.....e261a1c13385e63aa724bc1e3d97262d