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Updated: Aug 26, 2026

Biofunctionalization of Magnetic Nanomaterials
Published on: July 16, 2020
Use of magnetic nanoparticles as nanosensors to probe for molecular interactions
J Manuel Perez1, Lee Josephson, Ralph Weissleder
1Center for Molecular Imaging Research, Massachusetts General Hospital, Harvard Medical School, Building 149, 13th Street, 5404, Charlestown, MA 02129, USA.
Abstract:
Biocompatible magnetic nanosensors have been designed to detect molecular interactions in biological media. Upon target binding, these nanosensors cause changes in the spin-spin relaxation times of neighboring water molecules, which can be detected by magnetic resonance (NMR/MRI) techniques. These magnetic nanosensors have been designed to detect specific mRNA, proteins, enzymatic activity, and pathogens (e.g., virus) with sensitivity in the low femtomole range (0.5-30 fmol).
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