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Microchimica Acta

, Volume 184, Issue 5, pp 1295–1304 | Cite as

Multicolor immunochromatographic strip test based on gold nanoparticles for the determination of aflatoxin B1 and fumonisins

  • Fabio Di Nardo
  • Claudio Baggiani
  • Cristina Giovannoli
  • Giulia Spano
  • Laura Anfossi
Original Paper

Abstract

The authors describe the preparation of desert rose-like gold nanoparticles (DR-GNPs) with a plasmon resonance band at 620 nm which gives them a blue color. They have a hydrodynamic diameter of ∼72 nm and were prepared by a seeding growth approach. The DR-GNPs were characterized by UV-vis spectroscopy, transmission electron microscopy and dynamic light scattering. These nonspherical GNPs were used as a label for the antibody in an immunochromatographic strip test (ICST). Despite their particular shape and the higher surface area compared to spherical gold nanoparticles, the DR-GNPs are useful blue labels for the GNP-based strip test. A multicolor ICST for aflatoxin B1 and fumonisins is described that employs both blue DR-GNPs and red spherical GNPs. It allows for simultaneous rapid determination of the two mycotoxins in maize flour, with visual cut-off levels of 2 μg⋅kg-1 for aflatoxin B1 and of 1000 μg⋅kg-1 for fumonisins.

Graphical abstract

Blue desert rose-like gold nanoparticles (DR-GNPs) were synthesized, characterized and applied as label for the ImmunoChromatographic Strip Test (ICST) technique, in which red spherical GNPs (s-GNPs) are usually employed. The combined use of the blue DR-GNP and red s-GNPs allowed developing of an intuitive multicolor ICST for the simultaneous detection of aflatoxin B1 and fumonisins in maize flour.

Keywords

Non-spherical gold nanoparticles Labels for immunoassay Lateral flow assay Aflatoxin B1 Fumonisins Maize 

Notes

Acknowledgements

Authors are grateful to Dr. M. Manzoli and Prof. V. Maurino for the fruitful and helpful discussion related to the TEM and DLS measurements.

Compliance with ethical standards

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

Supplementary material

604_2017_2121_MOESM1_ESM.docx (2.4 mb)
ESM 1 (DOCX 2470 kb)

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Copyright information

© Springer-Verlag Wien 2017

Authors and Affiliations

  • Fabio Di Nardo
    • 1
  • Claudio Baggiani
    • 1
  • Cristina Giovannoli
    • 1
  • Giulia Spano
    • 1
  • Laura Anfossi
    • 1
  1. 1.Department of ChemistryUniversity of TurinTurinItaly

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