A chemiluminescent metalloimmunoassay based on silver deposition on colloidal gold labels.
A sensitive chemiluminescent (CL) immunoassay of human immunoglobulin (IgG) which combined the inherent high sensitivity of CL analysis with the dramatic signal amplification of silver precipitation on colloidal gold tags was developed. First, the sandwich-type complex was formed in this protocol by the primary antibody immobilized on the polystyrene wells, the analyte in the sample, and the secondary antibody labeled with colloidal gold. Second, the colloidal gold was treated by an Ag(+) reduction solution, which resulted in the catalytic precipitation of silver on the surface of colloidal gold. Third, a large number of Ag(+) were oxidatively released in HNO(3) solution from the silver metal anchored on the sandwich-type complexes and then the human IgG was indirectly determined by a sensitive combined CL reaction of Ag(+)-K(2)S(2)O(8)-Mn(2+)- H(3)PO(4)-luminol. The chemiluminescence intensity depends linearly on the logarithm of the concentration of human IgG over the range of 0.02-50ngml(-1) and detection limit (3sigma) is 0.005ngml(-1) (i.e., approximately 3x10(-14)M, 3amol in 100-mul sample). This assay has been successfully applied to the determination of human IgG in human serum samples and showed great potential for numerous applications in immunoassay.
Li
Zheng-Ping
ZP
College of Chemistry and Environmental Science, Hebei University, Baoding 071002, Hebei Province, People's Republic of China. lzpbd@mail.hbu.edu.cn
Liu
Cheng-Hui
CH
Fan
Yong-Shan
YS
Wang
Yu-Cong
YC
Duan
Xin-Rui
XR
D000818:Animals; D015374:Biosensing Techniques / Q000295:instrumentation / Q000379:methods*; D002417:Cattle; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D017979:Gold Colloid / Q000737:chemistry; D006801:Humans; D007118:Immunoassay / Q000295:instrumentation / Q000379:methods*; D007074:Immunoglobulin G / Q000032:analysis*; D008163:Luminescent Measurements; D011817:Rabbits; D012680:Sensitivity and Specificity; D012834:Silver / Q000737:chemistry*; D013194:Staining and Labeling
D020099:Coated Materials, Biocompatible; D017979:Gold Colloid; D007074:Immunoglobulin G; D012834:Silver; D006046:Gold