Optical Aptasensors for the Analysis of the Vascular Endothelial Growth Factor (VEGF)
Resource
ANALYTICAL CHEMISTRY, 84(14), 6192-98
Journal
Analytical Chemistry
Journal Volume
84
Journal Issue
14
Pages
6192-6198
Date Issued
2012
Date
2012
Author(s)
Freeman, Ronit
Girsh, Julia
Jou, Amily Fang-ju
Hug, Thomas
Dernedde, Jens
Willner, Itamar
Abstract
The vascular endothelial growth factor, VEGF, is an important biomarker for different diseases and clinical disorders. We present a series of optical aptasensor-based sensing platforms for VEGF that include the following: (i) A FRET-based sensor that involves the VEGF-induced separation of aptamer-functionalized quantum dots blocked by a quencher nucleic acid (detection limit 1 nM). (ii) A FRET-based sensor based on the VEGF-induced assembly of the aptamer subunits functionalized with QDs and a dye acceptor (Cy5), respectively (detection limit 12 nM). (iii) A chemiluminescence aptasensor based on VEGF-induced assembly of a hemin/G-quadruplex catalyst (detection limit 18 nM). (iv) A chemiluminescence aptasensor based on the VEGF-stimulated assembly of two aptamer subunits into the hemin/G-quadruplex catalyst (detection limit 2.6 nM). (v) A chemiluminescence resonance energy transfer (CRET) aptasensor based on the VEGF-induced assembly of a semiconductor QDs-hemin/G-quadruplex supramolecular structure (detection limit 875 pM). Furthermore, an amplified optical aptasensor system based on the Exonuclease III (Exo III) recycling of the VEGF analyte was developed. In this system, one aptamer subunit is modified at its 5′ and 3′ ends with QDs and a black hole quencher, respectively. The VEGF-induced self-assembly of the aptamer subunits result in the digestion of the quencher units and the autonomous recycling of the analyte, while triggering-on the luminescence of the QDs (detection limit 5 pM). The system was implemented to analyze VEGF in human sera samples. ? 2012 American Chemical Society.
Other Subjects
Analytes; Aptamers; Aptasensors; Black holes; Clinical disorders; Detection limits; Exonuclease; Functionalized; Human serum; Resonance energy transfer; Sensing platforms; Supramolecular structure; Vascular endothelial growth factor; Catalysts; Energy transfer; Nucleic acids; Recycling; Sensors; Chemiluminescence; aptamer; exodeoxyribonuclease; exodeoxyribonuclease III; guanine quadruplex; hemin; quantum dot; vasculotropin A; article; blood; fluorescence resonance energy transfer; genetic procedures; genetics; human; light related phenomena; luminescence; metabolism; methodology; nucleotide sequence; Aptamers, Nucleotide; Base Sequence; Biosensing Techniques; Exodeoxyribonucleases; Fluorescence Resonance Energy Transfer; G-Quadruplexes; Hemin; Humans; Luminescent Measurements; Optical Processes; Quantum Dots; Vascular Endothelial Growth Factor A
Type
journal article
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