Positive nano labels

Positron emission tomography (PET) can be used to monitor the distribution and accumulation of radiolabeled nanomaterials in living subjects. Now, a team has found that graphene can be used instead of a chelating agent to act as intrinsic labeling. As such, nano particles might be exploited in biodiagnostics, such as detecting cancerous lesions or in biotherapy of such lesions or other tissues. These materials are metabolized much more slowly than conventional pharmaceuticals and so could be more effective in theranostics. They are also now known to become enriched in tumors through an effect called enhanced permeability and retention, which is another advantage.