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Magnetic Particle Sensing

The aim is to establish magnetic label-based immunoassays which employ the highly specific interaction between antigenes and antibodies in conjunction with magnetic nanoparticle markers for the detection and quantification of specific biomolecules.

Frequency Mixing SchemePrinciple of magnetic frequency mixing

The magnetic frequency mixing method based on the generation of intermodulation products at the nonlinear magnetization curve of the superparamagnetic particles is applied for measuring magnetic beads. Using AC excitation at two different distinct frequencies, a sum frequency component is lock-in detected.

Magnetic AssayScheme of magnetic assay

In a typical magnetic immunoassay, suitable antibodies are immobilized in the pores of a polyethylene filter. Then, the sample solution is washed through the filter. Subsequently a solution of biotinylated secondary antibodies and the streptavidin-coated magnetic beads are added. The unbound particles are removed by washing. Only if the sample contains antigens which fit the antibodies, the whole chain of sample, secondary antibody and magnetic bead is captured in the filter. A magnetic measurement allows to quantify the sample by detecting the amount of magnetic beads.

Additional Information

Contact:

Prof. Dr. Hans-Joachim Krause
Tel.:  +49-2461-61-2955
e-mail: h.-j.krause@fz-juelich.de

More Information

 

Research Group

Magnetic Field Sensors

 

Project

AquaNANO


Publications:

C.-B. Kim, E.-G. Lim, S.W. Shin, H.-J. Krause, H.B. Hong, Magnetic immunoassay platform based on the planar frequency mixing magnetic technique, Biosens. Bioelectron. 83, 293-299 (2016).

 

S. Rettcher, F. Jungk, C. Kühn, H.-J. Krause, G. Nölke, U. Commandeur, R. Fischer, S. Schillberg, F. Schröper, A simple and portable magnetic immunoassay for the rapid detection and sensitive quantification of plant viruses, Appl. Environ. Microbiol. 81, 3039-3048 (2015).

 

H.-J. Krause, N. Wolters, Y. Zhang, A. Offenhäusser, P. Miethe, M.H.F. Meyer, M. Hartmann, M. Keusgen, Magnetic particle detection by frequency mixing for immunoassay applications, J. Magn. Magn. Mater. 311 (2007) 436-444.


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