Abstract
A naked-eye sensitive ELISA-like assay was developed based on gold-enhanced peroxidase-like activity of gold nanoparticles (AuNPs). Using human IgG (H-IgG) as an analytical model, goat anti-human IgG antibody (anti-IgG) adsorbed on microtiter plate and AuNPs-labeled anti-IgG acted as capture antibody and detection antibody, respectively. Because the surfaces of AuNPs were blocked by protein molecules, the peroxidase-like activity of AuNPs was almost inhibited, evaluated by the catalytic oxidation of peroxidase enzyme substrate 3,3′,5,5′-tetramethylbenzidine (TMB), which could produce a bright blue color in the presence of H2O2. Fortunately, the catalytic ability of AuNPs was dramatically increased by the deposition of gold due to the formation of a new gold shell on immunogold. Under optimal reaction conditions, the colorimetric immunoassay presented a good linear relationship in the range of 0.7–100 ng/mL and the limit of detection (LOD) of 0.3 ng/mL calculated by 3σ/S for UV-vis detection, and obtained LOD of 5 ng/mL for naked-eye detection. The obtained results were competitive with conventional sandwich ELISA with the LOD of 1.6 ng/mL. Furthermore, this developed colorimetric immunoassay was successfully applied to diluted human serum and fetal bovine serum samples, and predicted a broad prospect for the use of peroxidase-like activity involving nanomaterials in bioassay and diagnostics.
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This work was financially supported by the National Natural Science Foundation of China (grant no. 21275158, 21575159), the 100 Talents Program of the Chinese Academy of Sciences, and the National Research Foundation of Korea (grant no. 2008-0061891 and 2009-00426).
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Wang, S., Chen, Z., Choo, J. et al. Naked-eye sensitive ELISA-like assay based on gold-enhanced peroxidase-like immunogold activity. Anal Bioanal Chem 408, 1015–1022 (2016). https://doi.org/10.1007/s00216-015-9219-8
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DOI: https://doi.org/10.1007/s00216-015-9219-8