title: Combination of aptamer with gold nanoparticles for electrochemical signal amplification: application to sensitive detection of platelet-derived growth factor.
abstract: In this paper, we report a novel electrochemical detection approach for platelet-derived growth factor (PDGF) via "sandwich" structure and gold nanoparticles (Au-NPs) mediated amplification technique. The "sandwich" structure is fabricated based on the fact that PDGF has two aptamer-binding sites, which makes it possible for one PDGF molecule to connect with two aptamers simultaneously. It is found that this electrochemical system with "sandwich" structure and Au-NPs can significantly amplify the signal of electrochemical probe [Ru(NH(3))(5)Cl](2+) for PDGF detection, and thus increase the detection sensitivity significantly. As a result, this PDGF detection approach obtains an extraordinarily low detection limit of 1 x 10(-14)M for purified samples, 1 x 10(-12)M for contaminated-ridden samples or undiluted blood serum. This detection approach can also exhibit good stability and excellent specificity.
authors.affiliation: Department of Biochemistry and National Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
authors.forename: Wenying
authors.initials: W
authors.lastname: Meng
authors.forename: Xiaofeng
authors.initials: X
authors.lastname: Zheng
authors.forename: Shanli
authors.initials: S
authors.lastname: Liu
authors.forename: Genxi
authors.initials: G
authors.lastname: Li
mesh_terms: D052157:Aptamers, Nucleotide / Q000737:chemistry*; D015374:Biosensing Techniques / Q000295:instrumentation*; D004563:Electrochemistry / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006046:Gold / Q000737:chemistry*; D008832:Microchemistry / Q000295:instrumentation* / Q000379:methods; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000295:instrumentation*; D010982:Platelet-Derived Growth Factor / Q000032:analysis*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D052157:Aptamers, Nucleotide; D010982:Platelet-Derived Growth Factor; D006046:Gold