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Label-free optical biosensor for detection and quantification of the non-steroidal anti-inflammatory drug diclofenac in milk without any sample pretreatment

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Abstract

A label-free optical biosensor for detection and quantification of diclofenac in bovine milk has been developed. This was achieved by using reflectometric interference spectroscopy as detection method. In a first step, the immunosensor was developed and optimised in buffer concerning sensitivity, selectivity, stability and reproducibility. By comparing recovery rates—not only the good intra- but also the good inter-chip—reproducibility could be proven. Consequently, the assay was transferred in the more complex matrix milk. By utilising an optimised surface modification and evaluation method, matrix effects could successfully be prevented or circumvented. As a result, the developed immunosensor does not need sample pretreatment at all. By obtaining a limit of detection of 0.112 μg L−1 (0.108 μg kg−1), the capability of the developed biosensor is comparable or better than those of standard detection methods. Moreover, the presented biosensor reaches the range of the maximum residue limit (0.1 μg kg−1) set by the European Union. Thus, for the first time, diclofenac was successfully quantified at relevant levels in milk by using an optical biosensor.

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Authors and Affiliations

  1. Institute of Physical and Theoretical Chemistry (IPTC), Eberhard Karls University Tübingen, Auf der Morgenstelle 15, 72076, Tübingen, Germany

    Sabrina Rau, Urs Hilbig & Günter Gauglitz

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  1. Sabrina Rau
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  2. Urs Hilbig
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  3. Günter Gauglitz
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Correspondence to Sabrina Rau.

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Sabrina Rau and Urs Hilbig dedicate this article to Professor Günter Gauglitz on the occasion of his 70th birthday.

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Rau, S., Hilbig, U. & Gauglitz, G. Label-free optical biosensor for detection and quantification of the non-steroidal anti-inflammatory drug diclofenac in milk without any sample pretreatment. Anal Bioanal Chem 406, 3377–3386 (2014). https://doi.org/10.1007/s00216-014-7755-2

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