The need for stable, mono-dispersed, and biofunctional magnetic nanoparticles for one-step magnetic immunoassays
Paper in proceedings, 2010

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.

Author

Fredrik Öisjöen

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Justin Schneiderman

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Andrea Prieto Astalan

Imego AB - The Institute of Micro and Nanotechnology

Alexei Kalaboukhov

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Christer Johansson

Imego AB - The Institute of Micro and Nanotechnology

Dag Winkler

Chalmers, Microtechnology and Nanoscience (MC2)

Journal of Physics: Conference Series

17426588 (ISSN) 17426596 (eISSN)

Vol. 200 SECTION 12 Art. nr. 122006-

Subject Categories

Physical Sciences

Biophysics

DOI

10.1088/1742-6596/200/12/122006

More information

Created

10/8/2017