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Real-time immuno-PCR assay for detecting PCBs in soil samples

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Abstract

A fast and robust assay, based on immuno-polymerase chain reaction (IPCR) techniques, was developed for the detection of polychlorinated biphenyls (PCBs) in soil samples. Real-time IPCR (rt-IPCR) is a powerful technique that combines enzyme-linked immunosorbent assay (ELISA) with the specificity and sensitivity of PCR. In our assay, indirect ELISAs based on immobilization of PCB37 hapten–ovalbumin conjugates was used for evaluation of the immune response. The effect of optimal reagent concentrations to reduce background fluorescence was also investigated. Using the optimized assay, the linear sensitivity range of the assay covered more than six orders of magnitude, and the minimum detection limits reached 5 fg ml–1 antigen. Rt-IPCR was tested for its cross-reactivity profiles using four selected congeners and four Aroclor products. The assays were highly specific for congeners but less specific for Aroclor1242. We took four soil samples to validate the method, and the results were confirmed by gas chromatography/mass spectrometry (GC/MS). The rt-IPCR results for soil samples correlated well with the concentrations of PCBs obtained by GC/MS (r = 0.99, n = 6). These data indicate that this highly specific, sensitive, and robust assay can be modified for detecting PCB compounds in the environment.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (no. 20677008) and The Research Fund for the Doctoral Program of Higher Education (20060255004).

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Authors and Affiliations

  1. College of Environmental Science and Engineering, DongHua University, Shanghai, 201620, China

    Han-Yu Chen & Hui-Sheng Zhuang

  2. School of Environmental Science and Engineering, Shanghai Jiao Tong Unversity, Shanghai, 200240, China

    Hui-Sheng Zhuang

  3. Department of Environment Engineering, Henan University Urban Construction, Henan, 467044, China

    Han-Yu Chen

Authors
  1. Han-Yu Chen
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  2. Hui-Sheng Zhuang
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Correspondence to Hui-Sheng Zhuang.

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Chen, HY., Zhuang, HS. Real-time immuno-PCR assay for detecting PCBs in soil samples. Anal Bioanal Chem 394, 1205–1211 (2009). https://doi.org/10.1007/s00216-009-2787-8

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  • DOI: https://doi.org/10.1007/s00216-009-2787-8

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