Stable free radicals for EPR and DNP imaging in biological media

Electron paramagnetic resonance and dynamic nuclear polarisation are two te chniques that allow the detection of free radicals, They can also be used f or in vivo studies for oximetry in blood or tissues. One of the main proble ms for the development of these techniques is the need of free radicals tha t are stable in biological media. We present in this communication a study by EPR and DNP of two free radicals that can be suitable for in vivo applic ations.