title: Amplified electrochemical aptasensor taking AuNPs based sandwich sensing platform as a model.
abstract: Here, we report a sensitive amplified electrochemical impedimetric aptasensor for thrombin, a kind of serine protease that plays important role in thrombosis and haemostasis. For improving detection sensitivity, a sandwich sensing platform is fabricated, in which the thiolated aptamers are firstly immobilized on a gold substrate to capture the thrombin molecules, and then the aptamer functionalized Au nanoparticles (AuNPs) are used to amplify the impedimetric signals. Such designed aptamer/thrombin/AuNPs sensing system could not only improve the detection sensitivity compared to the reported impedimetric aptasensors but also provide a promising signal amplified model for aptamer-based protein detection. In this paper, we realize a sensitive detection limit of 0.02 nM, with a linear range of 0.05-18 nM. Meanwhile, the effect of 6-mercaptohexanol (MCH) and 2-mercaptoethanol (MCE) on the modification of the electrode is investigated.
authors.affiliation: State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, PR China.
authors.forename: Bingling
authors.initials: B
authors.lastname: Li
authors.forename: Yuling
authors.initials: Y
authors.lastname: Wang
authors.forename: Hui
authors.initials: H
authors.lastname: Wei
authors.forename: Shaojun
authors.initials: S
authors.lastname: Dong
mesh_terms: D000669:Amplifiers, Electronic; D052157:Aptamers, Nucleotide / Q000737:chemistry*; D015374:Biosensing Techniques / Q000295:instrumentation* / Q000379:methods; D020099:Coated Materials, Biocompatible / Q000737:chemistry; D004563:Electrochemistry / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006046:Gold / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013917:Thrombin / Q000032:analysis*
chemical_list: D052157:Aptamers, Nucleotide; D020099:Coated Materials, Biocompatible; D006046:Gold; D013917:Thrombin