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Development of ELISA for Detection of Mercury Based on Specific Monoclonal Antibodies Against Mercury-Chelate

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Abstract

Immunoassays for heavy metals offer an alternative approach to traditional techniques for detection of mercury. In this study, a mercury-chelate was prepared with 1-(4-aminobenzyl) ethylenediamine-N,N,N′,N′-tetraacetic acid (aminobenzyl-EDTA). The resulting complex was linked to keyhole limpet hemocyanin (KLH) or bovine serum albumin via the amino group and used as the immunizing antigen or detection antigen, respectively. BALB/c mice were immunized with KLH-aminobenzyl-EDTA-Hg and spleen cells from BALB/C mice were fused with Sp2/0 cells. One cell line (5F7) produced monoclonal antibodies with preferential selectivity and sensitivity for aminobenzyl-EDTA-Hg. This cell line had an affinity constant of 4.31 × 109 L/mol and its cross-reactivity (CR) with other metals was <2%. The antibody was used for competitive indirect ELISA (CI-ELISA) for Hg2+ measurements. The detection range was 0.087–790.4 μg/L and the lower limit of detection was 0.042 μg/L. The concentrations of mercury in environmental water samples obtained by CI-ELISA correlated well with graphite furnace atomic absorption spectrometry (GFAAS), and the mean recovery was 88.82% to 104.64%. These results indicate that this method could be used for monitoring mercury of water.

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Acknowledgment

This work was supported by the National “863” Project (2007AA10Z440) of China and the National Natural Science Foundation of China (Nos. 30972224, 31072178, and 30871897).

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Correspondence to Xiaobing Li or Zhe Wang.

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Xiaobing LI and Guowen LIU contributed equally to this study.

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Zhang, Y., Li, X., Liu, G. et al. Development of ELISA for Detection of Mercury Based on Specific Monoclonal Antibodies Against Mercury-Chelate. Biol Trace Elem Res 144, 854–864 (2011). https://doi.org/10.1007/s12011-011-9031-z

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  • DOI: https://doi.org/10.1007/s12011-011-9031-z

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