期刊
BIOSENSORS & BIOELECTRONICS
卷 198, 期 -, 页码 -出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2021.113823
关键词
Fluorescent immunoassay; Wavelength-tunable; Cardiac troponin I; SARS-CoV-2 nucleocapsid protein; Horseradish peroxidase
类别
资金
- National Science Foundation of China [22174065]
- National Key R&D Program of China [2020YFA0709900]
A direct in situ high-performance HRP-labeled fluorescent immunoassay platform was developed using a rapid in situ fluorogenic reaction between PEI and PPD analogues to generate FCNPs. The proposed method exhibited a wide dynamic range and low detection limit, and was successfully applied to evaluate cTnI and SARS-CoV-2 N protein levels in serum.
Direct in situ fluorescent enzyme-linked immunosorbent assay (ELISA) is rarely investigated and reported. Herein, a direct in situ high-performance HRP-labeled fluorescent immunoassay platform was constructed. The platform was developed based on a rapid in situ fluorogenic reaction between Polyethyleneimine (PEI) and pPhenylenediamine (PPD) analogues to generate fluorescent copolymer nanoparticles (FCNPs). The formation mechanism of FCNPs was found to be the oxidation of center dot OH radicals, which was further proved by nitrogen protection and scavenger of center dot OH radicals. Meantime, the fluorescence wavelength of FCNPs could be adjusted from 471 to 512 nm by introducing various substitution groups into the PPD structure. Using cardiac troponin I (cTnI) and SARS-CoV-2 nucleocapsid protein (N-protein) as the model antigens, the proposed fluorescent ELISA exhibited a wide dynamic range of 5-180 ng/mL and a low limit of detection (LOD) of 0.19 ng/mL for cTnI, and dynamic range of 0-120 ng/mL and a LOD of 0.33 ng/mL for SARS-CoV-2 N protein, respectively. Noteworthy, the proposed method was successful applied to evaluate the cTnI and SARS-CoV-2 N protein levels in serum with satisfied results. Therefore, the proposed platform paved ways for developing novel fluorescence-based HRP-labeled ELISA technologies and broadening biomarker related clinical diagnostics.
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