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Updated: Aug 19, 2026

Rapid Nanoprobe Signal Enhancement by In Situ Gold Nanoparticle Synthesis
Published on: March 7, 2018
Enhanced sensitivity of surface plasmon resonance (SPR) immunoassays using a peroxidase-catalyzed precipitation
Min-Gon Kim1, Yong-Beom Shin, Jin-Mi Jung
1Korea Research Institute of Bioscience and Biotechnology, P.O. Box 115, Yuseong, Daejeon 305-600, Korea.
Abstract:
We describe a method to improve the sensitivity of surface plasmon resonance (SPR) immunoassays using a horseradish peroxidase (HRP)-catalyzed precipitation reaction. The precipitation reaction catalyzed by HRP bound to the SPR biosensor surface via a sandwich immunoassay induced a shift in the SPR angle. Human interferon (IFN)-gamma at concentrations ranging from 0.01 to 100 ng/ml was detectable by this method. We also show that this biocatalytic signal amplification method can be applied to SPR imaging (SPRI), in an immunoassay of multiple proteins on a protein microarray format.
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