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The Application of CdTe/CdS in the Detection of Carcinoembryonic Antigen by Fluorescence Polarization Immunoassay

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Abstract

A novel and portable strategy based on fluorescence polarization immunoassay (FPIA) using quantum dots (QDs) was described in this study for simple, rapid, and sensitive detection of carcinoembryonic antigen (CEA). Under optimal conditions, the sensor has a wide dynamic range (from 0.5 ng/mL to 200 ng/mL) and a good correlation. The limit of detection (LOD) is 0.21 ng/mL (S/N = 3). The sensor has been applied for detection of carcinoembryonic antigen in 10 human serum samples with the range of recovery from 92.1 % to 103.6 %. Furthermore, bioconjugation of the core–shell QDs with streptavidin (SA) has been successfully applied in immunofluorescent imaging of the human hepatocellular carcinoma (HEPG2) cell line. The experimental results demonstrated the successful application of QDs-based fluorescence polarization immunoassay for detection of target proteins of biomedical importance. This strategy shows great promise for clinical diagnoses and basic discovery with high sensitivity, good specificity, simple procedures and short analysis time.

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Acknowledgements

This work has been supported by National Natural Science Foundation of China (No. 21165004, 21163002), the Guangxi Natural Science Foundation of China (2010GXNSFF013001, 0728043), Innovation Plan in Graduate Education of Guangxi Province (2010106020703M70) and the project of Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources(Guangxi Normal University), Ministry of Education of China(CMEMR2011-14).

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Authors and Affiliations

  1. Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China), College of Chemistry and Chemical Engineering of Guangxi Normal University, Guilin, 541004, China

    Jianniao Tian, Liujin Zhou, Yanchun Zhao, Yuan Wang, Yan Peng, Xue Hong & Shulin Zhao

  2. College of Life Science, Guangxi Normal University, Guilin, 541004, China

    Yan Peng & Xue Hong

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  1. Jianniao Tian
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  2. Liujin Zhou
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  3. Yanchun Zhao
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  4. Yuan Wang
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  5. Yan Peng
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  6. Xue Hong
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  7. Shulin Zhao
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Correspondence to Jianniao Tian.

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Tian, J., Zhou, L., Zhao, Y. et al. The Application of CdTe/CdS in the Detection of Carcinoembryonic Antigen by Fluorescence Polarization Immunoassay. J Fluoresc 22, 1571–1579 (2012). https://doi.org/10.1007/s10895-012-1097-2

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  • DOI: https://doi.org/10.1007/s10895-012-1097-2

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