title: Laser-based double beam absorption detection for aggregation immunoassays using gold nanoparticles.
abstract: A laser-based double beam absorption detection system for aggregation immunoassays has been developed. The assay was based on the aggregation of gold nanoparticles that are coated with protein antigens in the presence of their corresponding antibodies. The aggregation of the gold nanoparticles results in an absorption change that is monitored at 635 nm using the double beam spectrometer. The noise level of the spectrometer is 1x10(-6)arbitrary units. This corresponds to a tenfold improvement in comparison to commercial absorption detectors and is comparable with previously reported more complicated laser-based absorption spectrometers. The dye Nile-Blue-A was used to test the analytical performance of the system. A limit of detection of 3x10(-8 )M Nile-Blue-A was observed. The relative standard deviation between consecutive measurements was lower than 1.5%. The system is suitable for field applications of aggregation-based immunoassays.
authors.affiliation: Department of Chemistry, University of New Orleans, Louisiana 70148, USA.
authors.forename: Nguyen Thi Kim
authors.initials: NT
authors.lastname: Thanh
authors.forename: J Harrison
authors.initials: JH
authors.lastname: Rees
authors.forename: Zeev
authors.initials: Z
authors.lastname: Rosenzweig
mesh_terms: D000042:Absorption; D017979:Gold Colloid / Q000737:chemistry*; D007118:Immunoassay / Q000379:methods*; D007834:Lasers; D010316:Particle Size; D012542:Scattering, Radiation; D013053:Spectrophotometry / Q000295:instrumentation* / Q000379:methods*; D013205:Staphylococcal Protein A / Q000032:analysis / Q000276:immunology; D013997:Time Factors
chemical_list: D017979:Gold Colloid; D013205:Staphylococcal Protein A