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Microchimica Acta

, Volume 184, Issue 10, pp 4159–4165 | Cite as

Rapid single-step upconversion-linked immunosorbent assay for diclofenac

  • Antonín Hlaváček
  • Miroslav Peterek
  • Zdeněk Farka
  • Matthias J. Mickert
  • Leonhard Prechtl
  • Dietmar Knopp
  • Hans H. GorrisEmail author
Original Paper

Abstract

The non-steroidal anti-inflammatory drug and analgesic diclofenac is a common micropollutant in water. A direct competitive upconversion-linked immunosorbent assay (ULISA) for diclofenac has been developed that is based on a nanoparticulate tracer consisting of a NaYF4:Yb,Er core (diameter of ~90 nm, excitation and emission wavelenghts 980 and 535 nm, respectively) enclosed by a carboxylated silica shell and finally coated with diclofenac-conjugated bovine γ-globulin. The proteinaceous coating prevents non-specific adsorption of the tracer to the microtiter plate and provides a structurally flexible linker for surface-exposed diclofenac to warrant efficient competition with free (analyte) diclofenac in real water samples. The tracer was purified by gel electrophoresis and lyophilized. Both processes have no adverse effects on the immunoassay. All assay components can be stored in a dry state without a cooling chain, and can be reactivated on demand. Hence, this ULISA is well suited for environmental monitoring in low-resource settings. The ULISA has a similar limit of detection (20 pg mL−1; equivalent to 70 pM) as the conventional ELISA, but the time for analysis is reduced to 70 min because no enzymatic amplification steps are involved.

Graphical abstract

Photon-upconversion nanoparticles (UCNP) doped with Yb3+ and Er3+ emit visible light under 980-nm excitation. A luminescent tracer consisting of a UCNP covered by diclofenac-modified bovine γ-globulin allows for the direct competitive detection of diclofenac in a single-step immunoassay without optical background interference

Keywords

Bioconjugation Electrophoretic purification Immunoassay Luminescence Pharmaceutical micropollutant Photon-upconversion 

Notes

Acknowledgements

We acknowledge financial support from the COST Action CM1403 “The European Upconversion Network: From the Design of Photon-Upconverting Nanomaterials to Biomedical Applications”. H.H.G. acknowledges funding from the German Research Foundation for a Heisenberg Fellowship (DFG, Grant GO 1968/5-1 and GO 1968/6-1). Further funding was provided by the Czech Ministry of Education, Youth and Sports (COST CZ project LD15023), ANR-DFG program (project NArBioS, Grant no. ANR-11-INTB-1013) and the Grant Agency of the Czech Republic (P20612G014 GACR). CIISB research infrastructure project LM2015043 funded by MEYS CR is gratefully acknowledged for the financial support of the measurements at the CF Cryo-electron Microscopy and Tomography.

Compliance with ethical standards

The author(s) declare that they have no competing interests.

Supplementary material

604_2017_2456_MOESM1_ESM.docx (2.1 mb)
ESM 1 (DOCX 2177 kb)

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Copyright information

© Springer-Verlag GmbH Austria 2017

Authors and Affiliations

  • Antonín Hlaváček
    • 1
    • 2
    • 3
  • Miroslav Peterek
    • 2
  • Zdeněk Farka
    • 1
    • 2
  • Matthias J. Mickert
    • 1
  • Leonhard Prechtl
    • 4
  • Dietmar Knopp
    • 4
  • Hans H. Gorris
    • 1
    Email author
  1. 1.Institute of Analytical Chemistry, Chemo- and BiosensorsUniversity of RegensburgRegensburgGermany
  2. 2.CEITEC - Central European Institute of TechnologyMasaryk UniversityBrnoCzech Republic
  3. 3.Institute of Analytical Chemistry of the Czech Academy of Siences602 00 BrnoCzech Republic
  4. 4.Institute of HydrochemistryTechnical University of MunichMunichGermany

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