Abstract
Cu2+ are found to greatly reduce the photoinduced oxidase activity of fluorescein and then inhibit the chromogenic reaction catalyzed by fluorescein. A simple colorimetric assay for Cu2+ is established. Based on this, bifunctional nanocomposites of α-fetoprotein (AFP) antibody (Ab) and copper-based metal-organic framework (Ab2@Cu-MOF) are synthesized by the simple self-assembly of AFP Ab2, Cu2+, and 4,4′-dipyridyl: the binding site of AFP Ab2 exposed on the surface of the nanocomposites can specifically recognize AFP antigen; Cu2+ in nanocomposites can inhibit the visible light-induced activity of fluorescein. The structure of Ab2@Cu-MOF disintegrate and Cu2+ is released in an acetate buffer solution. The higher the amount of AFP antigens, the more significant the inhibitory effect. Thus, the Ab2@Cu-MOF immunoassay for AFP determination is established using 3,3′,5,5′-tetramethylbenzidine as chromogenic substrate with a detection limit of 35 pg.mL−1. This simple, cheap, and sensitive method sheds substantial light on practical clinical diagnosis. Meanwhile, the mechanism of inhibition is revealed to facilitate the targeted selection of enzyme regulators.
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This work was financially supported by the National Natural Science Foundation of China (Nos. 21405124, 21175110).
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Hu, X., Wei, Z., Sun, C. et al. Bifunctional antibody and copper-based metal-organic framework nanocomposites for colorimetric α-fetoprotein sensing. Microchim Acta 187, 465 (2020). https://doi.org/10.1007/s00604-020-04427-z
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DOI: https://doi.org/10.1007/s00604-020-04427-z