A simple colorimetric immunoassay for quantification of human immunoglobulin G (hIgG) is herein described. The assay is based on the aggregation inhibition of silver nanoparticles (AgNP) functionalized with hIgG antibody (anti-hIgG) on the surface. The aggregation is measured in terms of attenuance values ratio at 400 and 530 nm (A/A). A linear response between A/A and hIgG concentration is observed in the range 25 - 200 ng mL, and the detection limit is estimated as 11 ng mL hIgG.
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