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CdZnTeS Quantum Dots Based Electrochemiluminescent Image Immunoanalysis.

Xiu-Li Liang, N. Bao, X. Luo, Shou-Nian Ding
Published 2018 · Chemistry, Medicine

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In this work, quaternary CdZnTeS quantum dots (QDs) with a particularly strong electrochemiluminescence (ECL) were synthesized as ECL signal labels. The strong ECL signals can be obtained at both cathode and anode with the ECL efficiencies of 19.78% and 1.62%, respectively. The sandwich-structured ECL immunosensors for the detection of alpha-fetoprotein (AFP) and cancer antigen 125 (CA125) were accomplished with direct ECL image analysis. Under optimal conditions, the QDs-based ECL image immunoanalysis possessed good linearity from 0.5 ng/mL to 20 ng/mL for AFP and from 20 U/mL to 500 U/mL for CA125 with the detection limit of 0.1 ng/mL and 6 U/mL, respectively (S/N = 3), and the lower detection limit obtained by photomultiplier tube were 0.1 fg/mL for AFP and 0.03 mU/mL for CA125 with the wide dynamic range from 0.5 fg/mL to 20 ng/mL and from 0.1 mU/mL to 500 U/mL, respectively (S/N = 3). Furthermore, the ECL immunoanalysis was evaluated with commercial enzyme-linked immunosorbent assay in human serum samples. The good results indicated that CdZnTeS QDs-based ECL biosensor has great potential for fast biomedical screening and multi-assays in clinical diagnosis.
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