| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1242946 | Talanta | 2013 | 6 Pages |
This study developed a sensitive and selective aptamer-based chemiluminescent (CL) method for the determination of platelet-derived growth factor (PDGF)-BB using hydroxylamine enlarged gold nanoparticles (Au NPs). Rabbit anti-human PDGF-BB polyclonal antibody was covalently coupled on the 96-well plate that offers reactive N-oxysuccinimide ester (referred to as NOS group) surface. In the presence of target protein, the biotinylated aptamer was captured on the 96-well plate forming an antibody/PDGF-BB/biotinylated aptamer sandwiched complex, which was followed by the assembly of streptavidin coated Au NPs (streptavidin–gold). Au NPs assembled on the surface of 96-well plate reacted with HAuCl4 and NH2OH, which enabled the catalytic deposition of gold metal onto the Au NPs surfaces. A huge number of Au3+ ions were released from the hydroxylamine enlarged Au NPs after oxidative gold metal dissolution, which was determined by a simple and sensitive luminol CL reaction. The results showed that the detection limit of the assay is 60 pM of PDGF-BB (corresponding to 6 fmol in a 100 μL volume), which compares favorably with those of other PDGF-BB detection techniques. In addition, this aptameric CL biosensor demonstrated extraordinary specificity. And PDGF-BB has been determined in diluted serum indicating the applicability of this assay.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► An aptameric sensor for PDGF-BB using hydroxylamine amplified Au NP was developed. ► The working range is 0.06–6 nM and the detection limit is 60 pM. ► The new CL aptameric assay exhibits high sensitivity and extraordinary specificity. ► The proposed protocol can potentially become a powerful tool for protein detection.
