title: Plasmonics-Based Detection of Virus Using Sialic Acid Functionalized Gold Nanoparticles.
abstract: Biosensor for the detection of virus was developed by utilizing plasmonic peak shift phenomenon of the gold nanoparticles and viral infection mechanism of hemagglutinin on virus and sialic acid on animal cells. The plasmonic peak of the colloidal gold nanoparticles changes with the aggregation of the particles due to the plasmonic interaction between nearby particles and the color of the colloidal nanoparticle solution changes from wine red to purple. Sialic acid reduced and stabilized colloidal gold nanoparticle aggregation is induced by the addition of viral particles in the solution due to the hemagglutinin-sialic acid interaction. In this work, sialic acid reduced and stabilized gold nanoparticles (d = 20.1 ± 1.8 nm) were synthesized by a simple one-pot, green method without chemically modifying sialic acid. The gold nanoparticles showed target-specific aggregation with viral particles via hemagglutinin-sialic acid binding. A linear correlation was observed between the change in optical density and dilution of chemically inactivated influenza B virus species. The detection limit of the virus dilution (hemagglutinination assay titer, 512) was shown to be 0.156 vol% and the upper limit of the linearity can be extended with the use of more sialic acid-gold nanoparticles.
authors.affiliation: Department of Chemistry, University of Cincinnati, Cincinnati, OH, 45221, USA.
authors.forename: Changwon
authors.initials: C
authors.lastname: Lee
authors.affiliation: Department of Chemistry, University of Cincinnati, Cincinnati, OH, 45221, USA.
authors.forename: Peng
authors.initials: P
authors.lastname: Wang
authors.affiliation: Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati, Cincinnati, OH, 45221, USA.
authors.forename: Marsha A
authors.initials: MA
authors.lastname: Gaston
authors.affiliation: Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati, Cincinnati, OH, 45221, USA.
authors.forename: Alison A
authors.initials: AA
authors.lastname: Weiss
authors.affiliation: Department of Chemistry, University of Cincinnati, Cincinnati, OH, 45221, USA. zhangph@ucmail.uc.edu.
authors.forename: Peng
authors.initials: P
authors.lastname: Zhang
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation / Q000379:methods*; D003124:Colorimetry / Q000295:instrumentation / Q000379:methods; D006046:Gold / Q000737:chemistry; D006388:Hemagglutinins / Q000737:chemistry; D006801:Humans; D053768:Metal Nanoparticles / Q000737:chemistry; D019158:N-Acetylneuraminic Acid / Q000032:analysis*; D009975:Orthomyxoviridae / Q000737:chemistry; D010316:Particle Size; D012680:Sensitivity and Specificity; D020349:Surface Plasmon Resonance / Q000295:instrumentation / Q000379:methods*; D014771:Virion / Q000737:chemistry
chemical_list: D006388:Hemagglutinins; D006046:Gold; D019158:N-Acetylneuraminic Acid
keywords: Biosensor; Colorimetric measurement; Gold nanoparticle; Sialic acid; Viral detection