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Aptamer-based detection of plasma proteins by an electrochemical assay coupled to magnetic beads.
- Source :
-
Analytical chemistry [Anal Chem] 2007 Feb 15; Vol. 79 (4), pp. 1466-73. - Publication Year :
- 2007
-
Abstract
- The DNA thrombin aptamer has been extensively investigated, and the coupling of this aptamer to different transduction principles has demonstrated the wide applicability of aptamers as bioreceptors in bioanalytical assays. The goal of this work was to design an aptamer-based sandwich assay with electrochemical detection for thrombin analysis in complex matrixes, using a simple target capturing step by aptamer-functionalized magnetic beads. The conditions for the aptamer immobilization and for the protein binding have been first optimized by surface plasmon resonance, and then transferred to the electrochemical-based assay performed onto screen-printed electrodes. The assay was then applied to the analysis of thrombin in buffer, spiked serum, and plasma and high sensitivity and specificity were found. Moreover, thrombin was generated in situ in plasma by the conversion of its precursor prothrombin, and the formation of thrombin was followed at different times. The concentrations detected by the electrochemical assay were in agreement with a simulation software that mimics the formation of thrombin over time (thrombogram). The proposed work demonstrates that the high specificity of aptamers together with the use of magnetic beads are the key features for aptamer-based analysis in complex matrixes, opening the possibility of a real application to diagnostics or medical investigation.
- Subjects :
- Aptamers, Nucleotide chemistry
Biosensing Techniques instrumentation
Electrochemistry
Electrodes
Enzymes, Immobilized analysis
Equipment Design
Equipment Failure Analysis
Humans
Protein Binding
Sensitivity and Specificity
Surface Plasmon Resonance
Surface Properties
Time Factors
Biosensing Techniques methods
Magnetics
Serum Albumin analysis
Thrombin analysis
Subjects
Details
- Language :
- English
- ISSN :
- 0003-2700
- Volume :
- 79
- Issue :
- 4
- Database :
- MEDLINE
- Journal :
- Analytical chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 17297945
- Full Text :
- https://doi.org/10.1021/ac061879p