期刊
ANALYTICAL CHEMISTRY
卷 92, 期 7, 页码 5540-5545出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.0c00403
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资金
- Natural Science Foundation of China [21874014, 21727811, 21675019]
- Fundamental Research Funds for the Central Universities [N180505021, N170504017]
The enzyme-linked immunosorbent assay (ELISA) is widely used in clinical diagnostics. However, conventional ELISA is labor-intensive and lengthy. Herein, the sensitive detection of biomarkers with only one-step incubation of 20 min is demonstrated, based on antibody-fused, boronic-acid-decorated carbon nitride nanosheets. The decoration of carbon nitride nanosheets with boronic acid facilitates antibody binding at physiological conditions along with a concomitant fluorescence enhancement. The presence of target antigen results in a decrement of the fluorescence and ensures one-step immunofluorescent detection. The immune recognition of the antibody/target antigen in combination with glucose blocking ensures a highly selective assay of the biomarkers. The protocol is validated by the assay of nonglycoprotein, glycoprotein, and small-molecular-toxin targets. The multiplex target detection capability is demonstrated by the simultaneous assay of the triple cardiac biomarker cTnI, Mb, and CK-MB in human serum.
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