Ultrasensitive chemiluminescent immunoassay of Salmonella with silver enhancement of nanogold labels
- 1 March 2011
- journal article
- research article
- Published by Wiley in Luminescence
- Vol. 26 (2), 136-141
- https://doi.org/10.1002/bio.1196
Abstract
In this paper, silver enhancement of nanogold labels coupled with chemiluminescence detection was developed for ultrasensitive immunoassay of Salmonella based upon antigen–antibody immunoreaction. Polyclonal rabbit anti-Salmonella sp. antibodies (pAb) were employed to establish the analytical protocol. The pAb coated onto ELISA microwell plates and Au nanoparticles (Au NPs) conjugated pAb capture target Salmonella to form a sandwich-type complex. Silver then was in situ deposited around the Au NPs core and resulted in the signal amplification. In consequence, silver was dissolved to form Ag+ and a sensitive chemiluminescence based on the Ag+–K2S2O8–Mn2+–luminol system was coupled for further signal amplification. Under the optimized conditions, the chemiluminescent intensity is proportional to target Salmonella over the range of 5–1038 cfu mL−1 with a detection limit of 5 cfu mL−1. The relative standard deviation for 11 measurements of about 50–100 cfu/mL target Salmonella is 4.7%. The proposed method was successfully applied to measure Salmonella in food samples and the results are identical to those of the offical standard method of China. These offer us a more powerful tool for ultrasensitive assay of foodborne pathogens. Copyright © 2010 John Wiley & Son, Ltd.Keywords
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