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• W2944095083 abstract "A colorimetric immunoassay is a powerful tool for detecting tumor markers, with outstanding advantages of visualization and convenience. This study designed a colorimetric immunoassay using the antibody/antigen to control the catalytic activity to be “switched on/off”. This system, where Au NPs (18.5 ± 3.9 nm) were loaded on the g-C3N4 nanosheets that were fixed in a three-dimensional porous cellulose hydrogel, was used as a binding site for the antibody/antigen. After being incubated with an antibody of a cancer marker, the turned-off catalytic sites on Au NPs in Au@g-C3N4/microcrystalline cellulose hydrogels would not be “turned on” until the corresponding antigen was added. The number of the recovered Au active sites was related to the amount of the antigen added. The Fourier transform infrared and X-ray photoelectron spectroscopy measurements did not detect the existence of Au–S bonds. Catalyzed by the turned-on Au NPs, 4-nitrophenol was reduced to 4-aminophenol accompanied by a color fading. The color and the absorption spectrum changes in the process were used as the colorimetric quantitative basis for immunoassays. The colorimetric immunoassay showed a linear relationship with the liver cancer marker (α-fetoprotein, AFP) in the range of 0.1–10 000 ng/mL with the detection limit of 0.46 ng/mL. In addition, 4-nitrophenol had a significant color fading when the AFP concentration exceeded the healthy human threshold. The clinical patient’s serum test results obtained from the developed colorimetric immunosensor were consistent with those obtained from the commercial enzyme-linked immunosorbent assay. Furthermore, the immunosensor exhibited a good selectivity, repeatability, and stability, which demonstrated its potential for practical diagnostic application." @default.
• W2944095083 created "2019-05-16" @default.
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• W2944095083 date "2019-05-10" @default.
• W2944095083 modified "2023-10-16" @default.
• W2944095083 title "Colorimetric Immunosensor Based on Au@g-C₃N₄-Doped Spongelike 3D Network Cellulose Hydrogels for Detecting α-Fetoprotein" @default.
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• W2944095083 doi "https://doi.org/10.1021/acsami.9b06769" @default.
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