title: Silver nanoparticle-enhanced fluorescence resonance energy transfer sensor for human platelet-derived growth factor-BB detection.
abstract: A silver nanoparticle (AgNP)-enhanced fluorescence resonance energy transfer (FRET) sensing system is designed for the sensitive detection of human platelet-derived growth factor-BB (PDGF-BB). Fluorophore-functionalized aptamers and quencher-carrying strands hybridized in duplex are coupled with streptavidin (SA)-functionalized nanoparticles to form a AgNP-enhanced FRET sensor. The resulting sensor shows lower background fluorescence intensity in the duplex state due to the FRET effect between fluorophores and quenchers. Upon the addition of PDGF-BB, the quencher-carrying strands (BHQ-2) of the duplex are displaced leading to the disruption of the FRET effect. As a result, the fluorescent intensity of the fluorophore-aptamer within the proximity of the AgNP is increased. When compared to the gold nanoparticle (AuNP)-based FRET and bare FRET sensors, the AgNP-based FRET sensor showed remarkable increase in fluorescence intensity, target specificity, and sensitivity. Results also show versatility of the AgNP in the enhancement of sensitivity and selectivity of the FRET sensor. In addition, a good linear response was obtained when the PDGF-BB concentrations are in the ranges of 100-500 and 6.2-50 ng/mL with the detection limit of 0.8 ng/mL.
authors.affiliation: State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Li
authors.forename: Min
authors.initials: M
authors.lastname: Wang
authors.forename: Chongzhi
authors.initials: C
authors.lastname: Wang
authors.forename: Wei
authors.initials: W
authors.lastname: Li
authors.forename: Weibing
authors.initials: W
authors.lastname: Qiang
authors.forename: Danke
authors.initials: D
authors.lastname: Xu
mesh_terms: D000077214:Becaplermin; D015374:Biosensing Techniques; D031541:Fluorescence Resonance Energy Transfer; D006801:Humans; D053768:Metal Nanoparticles / Q000737:chemistry*; D020574:Proto-Oncogene Proteins c-sis / Q000032:analysis*; D012834:Silver / Q000737:chemistry*
chemical_list: D020574:Proto-Oncogene Proteins c-sis; D000077214:Becaplermin; D012834:Silver