Journal
ANALYTICAL CHEMISTRY
Volume 83, Issue 3, Pages 1137-1143Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ac103166n
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Funding
- National Natural Science Foundation of China [21075106]
- Henan Innovation Project for University Research Talent [2005126]
- Natural Science Foundation of Henan Province of China [092300410122]
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This technical note describes a new chemiluminescence immunoassay hyphenated to capillary electrophoresis (CE-based CL-IA) with gold nanoparticles (AuNPs) technique for biological molecules determination. AuNPs were used as a protein label reagent in the light of its excellent catalytic effect to the CL reaction of luminol and hydrogen peroxide. AuNPs conjugate with antibody (Ab) to form tagged antibody (Ab*), and then Ab* link to antigen (Ag) to produce an Ab*-Ag complex by a noncompetitive immunoreaction. The mixture of the excess Ab* and the Ab*-Ag complex was baseline separated and detected 1 within 5 min under the optimized conditions. This new protocol was evaluated with human immunoglobulin G (IgG) as the target molecule. The calibration curve of IgG was in the range of 0.008-5 mu g/mL with a correlation coefficient of 0.995. The detection limit (S/N = 3) of IgG was 1.14 x 10(-3) mu g/mL (7.1 pmol/L, 0.39 amol). The proposed AuNPs enhanced CE-based CL-IA method was successfully applied for the quantification of IgG in human sera from patients. It proves that the present method could be developed into a new and sensitive biochemical analysis technique.
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