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• W2005071818 abstract "In answer to the ever-increasing need to perform the simultaneous analysis of environmental hazards, microcarrier-based multiplex technologies show great promise. Further integration with biofunctionalized quantum dots (QDs) creates new opportunities to extend the capabilities of multicolor flow cytometry with their unique fluorescence properties. Here, we have developed a competitive microbead-based flow cytometric immunoassay using QDs fluorescent labels for simultaneous detection of two analytes, bringing the benefits of sensitive, rapid and easy-of-manipulation analytical tool for environmental contaminants. As model target compounds, the cyanobacterial toxin microcystin-LR and the polycyclic aromatic hydrocarbon compound benzo[a]pyrene were selected. The assay was carried out in two steps: the competitive immunological reaction of multiple targets using their exclusive sensing elements of QD/antibody detection probes and antigen-coated microsphere, and the subsequent flow cytometric analysis. The fluorescence of the QD-encoded microsphere was thus found to be inversely proportional to target analyte concentration. Under optimized conditions, the proposed assay performed well within 30 min for the identification and quantitative analysis of the two environmental contaminants. For microcystin-LR and benzo[a]pyrene, dose–response curves with IC50 values of 5 μg L−1 and 1.1 μg L−1 and dynamic ranges of 0.52–30 μg L−1 and 0.13–10 μg L−1 were obtained, respectively. Recovery was 92.6–106.5% for 5 types of water samples like bottled water, tap water, surface water and seawater using only filtration as sample pretreatment." @default.
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• W2005071818 date "2012-10-01" @default.
• W2005071818 modified "2023-10-06" @default.
• W2005071818 title "Multiplex competitive microbead-based flow cytometric immunoassay using quantum dot fluorescent labels" @default.
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• W2005071818 doi "https://doi.org/10.1016/j.aca.2012.05.017" @default.
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