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Analytical and Bioanalytical Chemistry

, Volume 405, Issue 24, pp 7841–7849 | Cite as

An electrochemical magneto immunosensor (EMIS) for the determination of paraquat residues in potato samples

  • Raul Garcia-Febrero
  • Enrique Valera
  • Alejandro Muriano
  • M.-Isabel Pividori
  • Francisco Sanchez-Baeza
  • M.-Pilar Marco
Research Paper
Part of the following topical collections:
  1. Rapid Detection in Food and Feed

Abstract

An electrochemical magneto immunosensor for the detection of low concentrations of paraquat (PQ) in food samples has been developed and its performance evaluated in a complex sample such as potato extracts. The immunosensor presented uses immunoreagents specifically developed for the recognition of paraquat, a magnetic graphite–epoxy composite (m-GEC) electrode and biofunctionalized magnetic micro-particles (PQ1-BSAMP) that allow reduction of the potential interferences caused by the matrix components. The amperometric signal is provided by an enzymatic probe prepared by covalently linking an enzyme to the specific antibodies (Ab198-cc-HRP). The use of hydroquinone, as mediator, allows recording of the signal at a low potential, which also contributes to reducing the background noise potentially caused by the sample matrix. The immunocomplexes formed on top of the modified MP are easily captured by the m-GEC, which acts simultaneously as transducer. PQ can be detected at concentrations as low as 0.18 ± 0.09 μg L−1. Combined with an efficient extraction procedure, PQ residues can be directly detected and accurately quantified in potato extracts without additional clean-up or purification steps, with a limit of detection (90 % of the maximum signal) of 2.18 ± 2.08 μg kg−1, far below the maximum residue level (20 μg kg−1) established by the EC. The immunosensor presented here is suitable for on-site analysis. Combined with the use of magnetic racks, multiple samples can be run simultaneously in a reasonable time.

Keywords

Electrochemical immunosensor Enzyme probe Paraquat Pesticide residues Potato Food safety 

Notes

Acknowledgments

E. Valera thank the support from the Spanish Government (Ministerio de Ciencia e Innovación) for a Juan de la Cierva fellowship. This work has been supported by the European Community (FP7-KBBE-211326). CIBER-BBN is an initiative funded by VI National R&D&i Plan 2008–2011, Iniciativa Ingenio 2010, Consolider Program, and CIBER Actions and financed by the Instituto de Salud Carlos III with assistance from the European Regional Development Fund. The AMR group (nowadays Nanobiotechnology for Diagnostics (Nb4D) group) is a consolidated Grup de Recerca de la Generalitat de Catalunya and has a support from the department d’Universitats, Recerca i Societat de la Informació de la Generalitat de Catalunya (expedient 2009 SER 1343).

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Raul Garcia-Febrero
    • 1
    • 2
  • Enrique Valera
    • 2
    • 1
  • Alejandro Muriano
    • 1
    • 2
  • M.-Isabel Pividori
    • 3
  • Francisco Sanchez-Baeza
    • 1
    • 2
  • M.-Pilar Marco
    • 1
    • 2
  1. 1.Nanobiotechnology for Diagnostics (Nb4D) groupIQAC-CSICBarcelonaSpain
  2. 2.CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN)BarcelonaSpain
  3. 3.Grup de Sensors i BiosensorsUnitat de Química AnalíticaBarcelonaSpain

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