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Title: Conjugated polymer as a signal amplifier for novel silica nanoparticle-based fluoroimmunoassay
Authors: Wang, Y.
Liu, B. 
Keywords: Antigen
Conjugated polymer
Energy transfer
Silica nanoparticle
Issue Date: 15-Jul-2009
Source: Wang, Y., Liu, B. (2009-07-15). Conjugated polymer as a signal amplifier for novel silica nanoparticle-based fluoroimmunoassay. Biosensors and Bioelectronics 24 (11) : 3293-3298. ScholarBank@NUS Repository.
Abstract: Immunoassays are conventional methods for protein detection, which rely on specific antibody-antigen recognition. Very few strategies have been developed for signal amplification of immunoassays. In this work, we report a conjugated polymer amplified silica nanoparticle (NP)-based immunoassay for IgG detection. After immobilization of the prime antibody on the NP surface, the NPs are used to capture antigen and Cy3 labeled secondary antibody in a sandwich assay format. The presence of target antigen in solution brings the fluorescent Cy3 molecules to the NP surface. Addition of a cationic conjugated polymer further amplifies the fluorescence signal of the dye, which improves the assay sensitivity and selectivity. Within the tested concentration range, a linear response for IgG detection is observed from 0 to 1 μg/mL with a detection limit of ∼1.1 ng/mL. Due to the pink color of Cy3 molecules, the assay also allows naked eye detection of IgG with a detection limit of 50 ng/mL. The polymer amplified NP assay represents a simple strategy for antigen detection with high sensitivity and selectivity. © 2009 Elsevier B.V. All rights reserved.
Source Title: Biosensors and Bioelectronics
ISSN: 09565663
DOI: 10.1016/j.bios.2009.04.020
Appears in Collections:Staff Publications

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