title: An electrochemical quartz crystal impedance study on anti-human immunoglobulin G immobilization in the polymer grown during dopamine oxidation at an Au electrode.
abstract: The polymeric film grown during dopamine oxidation at an Au electrode was studied as a novel matrix for immobilizing anti-human immunoglobulin G (IgG) via the electrochemical quartz crystal impedance analysis (EQCIA) method. The growth of the polymeric films at Au electrodes during dopamine oxidation in neutral phosphate buffer (pH 7.4) and the immobilization of anti-human IgG into the polymeric films during their growth have been traced at real time. Lysozyme control experiments suggested that anti-human IgG was electrostatically incorporated into the polymeric film. Also, the porosity of the polymeric films has been discussed by measuring the "wet" and "dry" frequency shifts. Compared with a polypyrrole film immobilized with anti-human IgG, the proposed matrix possessed a larger amount of specific binding sites for human IgG by subsequent immunoreaction tests. The association constant of the anti-human IgG immunoreaction was obtained with satisfactory results.
authors.affiliation: Key Laboratory of Chemical Biology & Traditional Chinese Medicine Research (Hunan Normal University), Ministry of Education, Hunan Normal University, Changsha 410081, People's Republic of China.
authors.forename: Hua
authors.initials: H
authors.lastname: He
authors.forename: Qingji
authors.initials: Q
authors.lastname: Xie
authors.forename: Shouzhuo
authors.initials: S
authors.lastname: Yao
mesh_terms: D003460:Crystallization; D004298:Dopamine / Q000737:chemistry*; D017097:Electric Impedance; D004563:Electrochemistry; D004566:Electrodes; D006046:Gold / Q000737:chemistry*; D006801:Humans; D007074:Immunoglobulin G / Q000737:chemistry*; D015394:Molecular Structure; D010084:Oxidation-Reduction; D010316:Particle Size; D011108:Polymers / Q000737:chemistry*; D011758:Pyrroles / Q000737:chemistry*; D011791:Quartz; D013499:Surface Properties
chemical_list: D007074:Immunoglobulin G; D011108:Polymers; D011758:Pyrroles; D011791:Quartz; C067635:polypyrrole; D006046:Gold; D004298:Dopamine