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Development of an enzyme-linked immunosorbent assay for metolcarb residue analysis and investigation of matrix effects from different agricultural products

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Abstract

The development of a direct competitive enzyme-linked immunosorbent assay based on polyclonal antibodies for N-methylcarbamate insecticide metolcarb is described. Two new haptens for the metolcarb were designed and synthesized. Both haptens were conjugated with keyhole limpet hemocyanin to form the immunogens. Four rabbits were immunized with the immunogens for production of polyclonal antibodies against metolcarb. Antisera titers were tested on the homologous coating antigens using a noncompetitive indirect enzyme-linked immunosorbent assay. The high titer antisera were used to develop the direct competitive enzyme-linked immunosorbent assay for the detection of metolcarb. The antibody–antigen combination with the highest selectivity for metolcarb was further optimized and its tolerance to changes in chemical conditions (ionic strength, pH value, and organic solvent) was studied. Under optimum conditions, the sensitivity and the limit of detection were determined to be 22 μg L−1 and 1.2 μg L−1 respectively. Determination of metolcarb in fruit juices and vegetables was accomplished by simple, rapid, and efficient extraction methods. Recoveries of metolcarb from spiked samples ranged from 80.5% to 109.5%. Validation of the developed immunosorbent assay was conducted by comparison of results from high-performance liquid chromatography. The correlation between the data obtained using developed immunosorbent assay and high-performance liquid chromatography was high (R 2 = 0.9884). Therefore, the developed immunosorbent assay in this study was suitable for the rapid quantitative determination of metolcarb in agricultural products.

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Acknowledgment

The authors are grateful for financial supports from the Chinese National “863” High Technology Research program (2006AA10Z448).

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Authors and Affiliations

  1. Key Laboratory of Food Nutrition and Safety, Ministry of Education of China, Tianjin University of Science and Technology, Tianjin, 300457, China

    Jing-Wei Sun, Bing Liu, Yan Zhang & Shuo Wang

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  1. Jing-Wei Sun
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  2. Bing Liu
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  3. Yan Zhang
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  4. Shuo Wang
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Correspondence to Shuo Wang.

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Sun, JW., Liu, B., Zhang, Y. et al. Development of an enzyme-linked immunosorbent assay for metolcarb residue analysis and investigation of matrix effects from different agricultural products. Anal Bioanal Chem 394, 2223–2230 (2009). https://doi.org/10.1007/s00216-009-2911-9

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  • DOI: https://doi.org/10.1007/s00216-009-2911-9

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