title: Application of electrochemical impedance spectroscopy for monitoring allergen-antibody reactions using gold nanoparticle-based biomolecular immobilization method.
abstract: Gold nanoparticles were used to enhance the immobilization amount and retain the immunoactivity of recombinant dust mite allergen Der f2 immobilized on a glassy carbon electrode (GCE). The interaction between allergen and antibody was studied by electrochemical impedance spectroscopy (EIS). Self-assembled Au colloid layer (ø=16nm) deposited on (3-mercaptopropyl)trimethoxysilane (MPTS)-modified GCE offered a basis to control the immobilization of allergen Der f2. The impedance measurements were based on the charge transfer kinetics of the [Fe(CN)(6)](3-/4-) redox pair, compared with bare GCE, the immobilization of allergen Der f2 and the allergen-antibody interaction that occurred on the electrode surface altered the interfacial electron transfer resistance and thereby slowed down the charge transfer kinetics by reducing the active area of the electrode or by preventing the redox species in electrolyte solution from approaching the electrode. The interactions of allergen with various concentrations of monoclonal antibody were also monitored through the change of impedance response. The results showed that the electron transfer resistance increased with increasing concentrations of monoclonal antibody.
authors.affiliation: State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, People's Republic of China.
authors.forename: Haizhen
authors.initials: H
authors.lastname: Huang
authors.forename: Zhigang
authors.initials: Z
authors.lastname: Liu
authors.forename: Xiurong
authors.initials: X
authors.lastname: Yang
mesh_terms: D000485:Allergens / Q000737:chemistry / Q000276:immunology*; D000937:Antigen-Antibody Reactions / Q000276:immunology; D017097:Electric Impedance; D004563:Electrochemistry / Q000379:methods*; D006046:Gold / Q000737:chemistry; D008962:Models, Theoretical; D053758:Nanoparticles / Q000737:chemistry; D036103:Nanotechnology / Q000295:instrumentation / Q000379:methods*; D013057:Spectrum Analysis / Q000379:methods*
chemical_list: D000485:Allergens; D006046:Gold