Department of Physics, University of South Florida, Tampa, Florida 33620, USA
Title: Recent Developments in Magnetic Impedance Biosensors and Related Medical Devices
Biography: Dr. Manh-Huong Phan
Early detection of cancer cells in the body greatly increases the chances of successful treatment. While traditional methods, such as visual identification of malignant changes, cell growth analysis, specific-ligand receptor labeling, or genetic testing often require lengthy analysis, a combination of ultrasensitive magnetic field sensors with functionalized magnetic nanoparticles offers a promising approach for a highly sensitive, simple, and quick detection of cancer cells and biomolecules. In this talk, I will review recent progress in the development of magnetic impedance biosensors using nanoparticles. I will present a new approach that integrates the magneto-resistance (MR), magneto-reactance (MX), and magneto-impedance (MI) effects  to develop a functional magnetic biosensor with tunable and enhanced sensitivity . The MX-based probe shows the most sensitive detection of superparamagnetic nanoparticles (~10 nm diameter) at low concentrations. A novel biosensor based on the MX effect of a soft ferromagnetic ribbon with a microhole-patterned surface has been developed, demonstrating its high capacity for the detection and quantification of anticancer drugs and proteins tagged to Fe3O4 nanoparticles, as well as Lewis lung carcinoma (LLC) cancer cells that have taken up Fe3O4 or MnO nanoparticles [2,3]. Finite Element simulation fully supports the experimental observations. Finally, novel classes of magnetic nanostructures for advanced biosensing [4,5] and new exploration in medical diagnostics  will be discussed.