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Multi-analyte SPR immunoassays for environmental biosensing of pesticides

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Abstract

Multi-analyte detection of environmentally relevant pesticides is performed by using a two-channelled surface plasmon resonance (SPR) biosensor. The special design of the SPR instrument allows the determination of several analytes (DDT, chlorpyrifos and carbaryl) via different immobilization formats. First, simultaneous pesticide monitoring is possible by flowing chlorpyrifos, carbaryl or DDT samples separately over each channel of the SPR system, wherein their corresponding recognition element was previously immobilized. The second approach is based on the multiple and combined immobilization of several analyte recognition elements on the sensing surface of one individual flow cell. In this format, the analysis time for all three pesticides varied from 40 to 60 min depending on the number of regeneration cycles. In most cases, similar detection limits were attained for the target analyte irrespective of the assay format, with sensitivity values at the nanogram per litre level (18–50 ng L−1). The assay reproducibility was proved through the repeated use of the same sensor surface for over more than 200 assay cycles, whereas the absence of biosensor response to non-related analytes showed the specificity and reliability of the analysis. The SPR instrument, including optics, electronics and microfluidics, is already commercialised by the company SENSIA, SL.

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Authors and Affiliations

  1. Biosensors Group, Microelectronics National Centre (CNM), CSIC, Isaac Newton 8, 28760 Tres Cantos, Madrid, Spain

    E. Mauriz, A. Calle & L. M. Lechuga

  2. Centro de Investigación e Innovación en Bioingeniería, Universidad Politécnica de Valencia, Camino de Vera s/n, 46022, Valencia, Spain

    J. J. Manclús & A. Montoya

Authors
  1. E. Mauriz
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  2. A. Calle
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  3. J. J. Manclús
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  4. A. Montoya
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  5. L. M. Lechuga
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Correspondence to E. Mauriz.

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Mauriz, E., Calle, A., Manclús, J.J. et al. Multi-analyte SPR immunoassays for environmental biosensing of pesticides. Anal Bioanal Chem 387, 1449–1458 (2007). https://doi.org/10.1007/s00216-006-0800-z

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  • DOI: https://doi.org/10.1007/s00216-006-0800-z

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