Demonstration of a surface plasmon-coupled emission (SPCE)-based immunoassay in the absence of a spacer layer

Analytical and Bioanalytical Chemistry
Jong Seol YukBrian D MacCraith

Abstract

The technique of surface plasmon-coupled emission (SPCE) involves the coupling of light which is emitted from a fluorophore into the surface plasmon of an adjacent thin metal film, giving rise to highly directional emission. We have combined the advantages of SPCE with the high light collection efficiency of supercritical angle fluorescence by carrying out an immunoassay on a paraboloid array biochip in the absence of the conventional SPCE spacer layer normally used to minimize metal quenching of the fluorescence. In this work, we have successfully demonstrated an SPCE-based assay by utilizing the protein assay layer as the spacer layer. A novel 3 × 3 injection molded polymer biochip with paraboloid elements was used. The paraboloid elements served to enhance the light collection efficiency while the top surface was coated with a gold layer to use excitation of surface plasmons and detection of SPCE emission. Theoretical modeling of the gold-protein layer structure showed that the surface plasmon resonance angles were located in the detection range of the paraboloid biochip. The polarization dependence of SPCE emission was also demonstrated. Finally, a human IgG sandwich immunoassay was carried out which exhibited a limit of de...Continue Reading

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Citations

Apr 25, 2012·Annual Review of Analytical Chemistry·Shuo-Hui CaoYao-Qun Li
Sep 25, 2012·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Wei-Peng CaiYao-Qun Li
Apr 18, 2020·Analytical and Bioanalytical Chemistry·Min ChenYao-Qun Li
Sep 10, 2013·The Journal of Physical Chemistry Letters·Sharmistha Dutta ChoudhuryJoseph R Lakowicz
Apr 7, 2015·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Sharmistha Dutta ChoudhuryJoseph R Lakowicz

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