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

Fredrik Öisjöen (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Justin F. Schneiderman (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; A. P. Astalan ; Alexei Kalaboukhov (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Christer Johansson ; Dag Winkler (Institutionen för mikroteknologi och nanovetenskap)
Journal of Physics: Conference Series (17426588). Vol. 200 (2010), SECTION 12, p. Art. nr. 122006.
[Konferensbidrag, refereegranskat]

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.



Denna post skapades 2010-04-26. Senast ändrad 2016-07-19.
CPL Pubid: 120357