期刊
COLLOIDS AND SURFACES B-BIOINTERFACES
卷 81, 期 2, 页码 549-554出版社
ELSEVIER
DOI: 10.1016/j.colsurfb.2010.07.056
关键词
Flow-injection analysis; Chemiluminescence; Immunoassay; CdTe nanoparticles
资金
- National Natural Science Foundation of China [20475020, 20075009, 20875036]
- Ministry of Science and Technology of Jilin Province, China [20080544]
In this paper we propose a specific sandwich immunoassay method for human-immunoglobulin C (HIgG). This immunoassay protocol takes advantage of sandwich binding of primary and secondary antibodies for increased specificity. Polystyrene microspheres (PS) serve as immobilizing support, site for sandwich immunoassay and then subsequently used for chemiluminescence (CL) detections. In this sandwich immunoassay, PS microspheres were modified with the primary anti-HIgG (Ab(1)) via electrostatic interaction, while CdTe nanoparticles (CdTeNPs) were modified with horseradish peroxidase labeled anti-HIgG (Ab(2)) via covalent binding. Antigen HIgG (Ag) was specifically captured by the first and secondary antibody and form sandwich immunoassay format. Combination of the remarkable sensitivity of CL method and the use of CdTe NPs as anti-HIgG-HRP carrier for the enzymatic signal amplification, provide a linear response range of HIgG from 0.01 to 300 ng mL(-1) with an extremely low detection limit of 0.3 pg mL(-1). This immunoassay system has many desirable merits including sensitivity, accuracy, and little required instrumentation. The assay results were compared with enzyme-linked immunosorbent assay (ELISA), and showed relatively good reliability. Significantly the new protocol may become quite promising technique for protein immune-detection as well as DNA analysis and other biological analyses. (C) 2010 Elsevier B.V. All rights reserved.
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