title: Fabricating Pt/Sn-In2O3Nanoflower with Advanced Oxygen Reduction Reaction Performance for High-Sensitivity MicroRNA Electrochemical Detection.
abstract: Herein, an efficient electrochemical tracer with advanced oxygen reduction reaction (ORR) performance was designed by controllably decorating platinum (Pt) (diameter, 1 nm) on the surface of compositionally tunable tin-doped indium oxide nanoparticle (Sn-In2O3) (diameter, 25 nm), and using the Pt/Sn-In2O3as electrochemical tracer and interfacial term hairpin capture probe, a facile and ultrasensitive microRNA (miRNA) detection strategy was developed. The morphology and composition of the generated Pt/Sn-In2O3NPs were comprehensively characterized by spectroscopic and microscopic measurements, indicating numerous Pt uniformly anchored on the surface of Sn-In2O3. The interaction between Pt and surface Sn as well as high Pt(111) exposure resulted in the excellent electrochemical catalytic ability and stability of the Pt/Sn-In2O3ORR. As proof-of-principle, using streptavidin (SA) functionalized Pt/Sn-In2O3(SA/Pt/Sn-In2O3) as electrochemical tracer to amplify the detectable signal and a interfacial term hairpin probe for target capture probe, a miRNA biosensor with a linear range from 5 pM to 0.5 fM and limit of detection (LOD) down to 1.92 fM was developed. Meanwhile, the inherent selectivity of the term hairpin capture probe endowed the biosensor with good base discrimination ability. The good feasibility for real sample detection was also demonstrated. The work paves a new avenue to fabricate and design high-effective electrocatalytic tracer, which have great promise in new bioanalytical applications.
authors.affiliation: Research Center for Bioengineering and Sensing Technology, Beijing Key Laboratory for Bioengineering and Sensing Technology, School of Chemistry and Bioengineering, University of Science & Technology Beijing , Beijing 100083, P.R. China.
authors.forename: Kai
authors.initials: K
authors.lastname: Zhang
authors.affiliation: Research Center for Bioengineering and Sensing Technology, Beijing Key Laboratory for Bioengineering and Sensing Technology, School of Chemistry and Bioengineering, University of Science & Technology Beijing , Beijing 100083, P.R. China.
authors.forename: Haifeng
authors.identifier: 0000-0002-6907-6578
authors.initials: H
authors.lastname: Dong
authors.affiliation: Research Center for Bioengineering and Sensing Technology, Beijing Key Laboratory for Bioengineering and Sensing Technology, School of Chemistry and Bioengineering, University of Science & Technology Beijing , Beijing 100083, P.R. China.
authors.forename: Wenhao
authors.initials: W
authors.lastname: Dai
authors.affiliation: Research Center for Bioengineering and Sensing Technology, Beijing Key Laboratory for Bioengineering and Sensing Technology, School of Chemistry and Bioengineering, University of Science & Technology Beijing , Beijing 100083, P.R. China.
authors.forename: Xiangdan
authors.initials: X
authors.lastname: Meng
authors.affiliation: Department of Environmental Science and Engineering, School of Chemistry and Environment, Beijing University of Aeronautics & Astronautics , Beijing 100083, P.R. China.
authors.forename: Huiting
authors.initials: H
authors.lastname: Lu
authors.affiliation: Research Center for Bioengineering and Sensing Technology, Beijing Key Laboratory for Bioengineering and Sensing Technology, School of Chemistry and Bioengineering, University of Science & Technology Beijing , Beijing 100083, P.R. China.
authors.forename: Tingting
authors.initials: T
authors.lastname: Wu
authors.affiliation: Research Center for Bioengineering and Sensing Technology, Beijing Key Laboratory for Bioengineering and Sensing Technology, School of Chemistry and Bioengineering, University of Science & Technology Beijing , Beijing 100083, P.R. China.
authors.forename: Xueji
authors.initials: X
authors.lastname: Zhang
mesh_terms: D020137:Base Pair Mismatch; D001483:Base Sequence; D015374:Biosensing Techniques / Q000379:methods*; D004563:Electrochemistry; D006367:HeLa Cells; D006801:Humans; D007204:Indium / Q000737:chemistry*; D057230:Limit of Detection; D035683:MicroRNAs / Q000032:analysis* / Q000235:genetics; D008958:Models, Molecular; D008968:Molecular Conformation; D053758:Nanoparticles / Q000737:chemistry*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry*; D010984:Platinum / Q000737:chemistry*; D014001:Tin / Q000737:chemistry*
chemical_list: D035683:MicroRNAs; D007204:Indium; D010984:Platinum; C047711:indium oxide; D014001:Tin; D010100:Oxygen