Magneto-Optical Relaxation Measurements of Functionalized Nanoparticles as a Novel BiosensorReportar como inadecuado




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University of Greifswald, Institute of Pharmacy, F.-L.-Jahn-Strasse 17, 17487 Greifswald, Germany





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Abstract Measurements of magneto-optical relaxation signals of magnetic nanoparticles functionalized with biomolecules are a novel biosensing tool. Upon transmission of a laser beam through a nanoparticle suspension in a pulsed magnetic field, the properties of the laser beam change. This can be detected by optical methods. Biomolecular binding events leading to aggregation of nanoparticles are ascertainable by calculating the relaxation time and from this, the hydrodynamic diameters of the involved particles from the optical signal. Interaction between insulin-like growth factor 1 IGF-1 and its antibody was utilized for demonstration of the measurement setup applicability as an immunoassay. Furthermore, a formerly developed kinetic model was utilized in order to determine kinetic parameters of the interaction. Beside utilization of the method as an immunoassay it can be applied for the characterization of diverse magnetic nanoparticles regarding their size and size distribution. View Full-Text

Keywords: magnetic nanoparticles; magneto-optical relaxation; immunoassay; IGF-1 assay magnetic nanoparticles; magneto-optical relaxation; immunoassay; IGF-1 assay





Autor: Konstanze Aurich * , Gunnar Glöckl, Stefan Nagel and Werner Weitschies

Fuente: http://mdpi.com/



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