Photoluminescence immunoassay based on grapefruit peel-extracted carbon quantum dots encapsulated into silica nanospheres for p53 protein
•An enhanced photoluminescence immunoassay was developed for p53 detection.•Grapefruit peel-extracted carbon dots were synthesized.•Carbon dots-encapsulated silica nanospheres were used for the signal amplification. We herein designed a simple and feasible photoluminescence (PL) immunoassay for sens...
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Published in | Biochemical engineering journal Vol. 139; pp. 109 - 116 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
15.11.2018
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Subjects | |
Online Access | Get full text |
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Summary: | •An enhanced photoluminescence immunoassay was developed for p53 detection.•Grapefruit peel-extracted carbon dots were synthesized.•Carbon dots-encapsulated silica nanospheres were used for the signal amplification.
We herein designed a simple and feasible photoluminescence (PL) immunoassay for sensitive detection of p53 protein in biological fluid by using grapefruit peel-extracted carbon quantum dots (CQDs) as the signal-generation tags. CQDs were first synthesized on the basis of grapefruit peel as the carbon source via a typical hydrothermal method. Thereafter, the synthesized CQDs were encapsulated into silica nanoparticles (CQD-SiNP) for the signal enhancement. In the presence of p53, a sandwich-type immunoreaction was fulfilled on monoclonal anti-p53 capture antibody-coated microplate by using CQD-SiNP-labeled polyclonal anti-p53 secondary antibody. Relative to CQD-labeled strategy, use of CQD-SiNP could amplify the photoluminescence signal toward the same-concentration target p53. Under the optimum conditions, the photoluminescence intensity via the CQD-SiNP-labeled strategy exhibited high sensitivity, and allowed the detection of target p53 as low as a concentration of 2.7 pg mL−1. No interfering signals were acquired toward non-target analytes including biomarkers or enzymes in human serum. Below 15% of relative standard deviations (RSDs) were obtained for detection of p53 analyte in all cases. Additionally, CQD-SiNP-based photoluminescence immunoassays were utilized for the evaluation of real human serum samples, and received well-matched results with commercial enzyme-linked immunosorbent assay (ELISA) kit. |
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ISSN: | 1369-703X 1873-295X |
DOI: | 10.1016/j.bej.2018.08.012 |