Journal
SENSORS
Volume 11, Issue 11, Pages 10490-10501Publisher
MDPI AG
DOI: 10.3390/s111110490
Keywords
aptamers; gold nanoparticles; rHuEPO-alpha; fluorescent probe
Funding
- National Natural Science Foundation of China [21175152]
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We present here a novel conjugated aptamer-gold nanoparticle (Apt-AuNPs) fluorescent probe and its application for specific detection of recombinant human erythropoietin-alpha (rHuEPO-alpha). In this nanobiosensor, 12 nm AuNPs function as both a nano-scaffold and a nano-quencher (fluorescent energy acceptor), on the surface of which the complementary sequences are linked (as cODN-AuNPs) and pre-hybridized with carboxymethylfluorescein (FAM)-labeled anti-rHuEPO-alpha aptamers. Upon target protein binding, the aptamers can be released from the AuNP surface and the fluorescence signal is restored. Key variables such as the length of linker, the hybridization site and length have been designed and optimized. Full performance evaluation including sensitivity, linear range and interference substances are also described. This nanobiosensor provides a promising approach for a simple and direct quantification of rHuEPO-alpha concentrations as low as 0.92 nM within a few hours.
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