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The need for stable, mono-dispersed, and biofunctional magnetic nanoparticles for one-step magnetic immunoassays

Conference paper
Authors Fredrik Öisjöen
Justin F. Schneiderman
A. P. Astalan
Alexei Kalaboukhov
Christer Johansson
Dag Winkler
Published in Journal of Physics: Conference Series
Volume 200
Issue SECTION 12
Pages Art. nr. 122006
ISSN 17426588
Publication year 2010
Published at
Pages Art. nr. 122006
Language en
Subject categories Physical Sciences, Biophysics


We have developed a magnetic immunoassay system (MIA) using magnetic nanoparticle markers for biomolecule detection. We have magnetically characterized multi-core magnetic nanoparticles (MNPs) containing single-domain crystals of Fe3O4 and CoFe2O4 with our system using a high temperature superconducting quantum interference device as detector. We use a Helmholtz coil to excite the MNPs and study the AC-susceptibility. The data is fit to a model and information about the particle size distribution of the MNP system is extracted. We observe high stability of the unfunctionalized MNPs. However, our MIA measurements require stable functionalized MNPs. We have found a significant increase in hydrodynamic size of the functionalized MNP systems in the course of just a few days caused by agglomeration behaviour. Separate measurements performed at Imego AB with their AC-Susceptometer, DynoMAG, confirm these findings. Without stable, functionalized MNPs MIAs of this kind are impossible. © 2010 IOP Publishing Ltd.

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