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Microgel-based etalon immunoassay for IgG detection

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Abstract

We developed an immunoassay for mouse immunoglobulin (IgG) quantitation using poly(N-isopropylacrylamide-co-acrylic acid) (pNIPAm-co-AAc) microgel-based etalon devices. To achieve this, a biotinylated primary antibody specific to mouse IgG was immobilized on the top Au layer of an etalon device via its interaction with a streptavidin-modified etalon surface. Mouse IgG captured on the etalon surface from the solution was quantified using an HRP-conjugated secondary antibody. HRP catalyzed the oxidation of 4-chloro-1-naphthol (4CN) to form insoluble 4-chloro-1-naphthon (4CNP), resulting in a concentration change of 4CN in solution. The etalon was able to detect the 4CN concentration change by monitoring the extent of the etalon’s reflectance peak shift, which allows the quantitation of mouse IgG. The etalon-based assay can detect mouse IgG down to 0.018 nM with a linear range of 0.02–5 nM.

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  1. Department of Chemistry, University of Alberta, Edmonton, Alberta, T6G 2G2, Canada

    Qiming Shen, Changhao Fang & Michael J. Serpe

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Shen, Q., Fang, C. & Serpe, M.J. Microgel-based etalon immunoassay for IgG detection. Anal Bioanal Chem 415, 5645–5656 (2023). https://doi.org/10.1007/s00216-023-04834-0

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