The contactless heating capacity of magnetic nanoparticles (MNPs) has been exploited in fields such as hyperthermia cancer therapy, catalysis, and enzymatic thermal regulation. Herein, we propose an advanced technology to generate multiple local temperatures in a single-pot reactor by exploiting the unique nanoheating features of iron oxide MNPs exposed to alternating magnetic fields (AMFs). The heating power of the MNPs depends on their magnetic features but also on the intensity and frequency conditions of the AMF. Using a mixture of diluted colloids of MNPs we were able to generate a multi-hot-spot reactor in which each population of MNPs can be selectively activated by adjusting the AMF conditions. The maximum temperature reached at the surface of each MNP was registered using independent fluorescent thermometers that mimic the molecular link between enzymes and MNPs. This technology paves the path for the implementation of a selective regulation of multienzymatic reactions.
This work was funded by the European Commission through the HOTZYMES Project (H2020-FETOPEN-RIA 829162), the Spanish Ministry of Economy and Competitiveness under Grant No. MAT2017-88148-R (AEI/FEDER, UE) and the PIE-201960E062 project, AEI (BIO2017-84246-C2-1-R project to V.G. and J.M.F., and PID2019-109514RJ-100 to D.S.), Nanotechnology in translational hyperthermia (HIPERNANO) - RED2018-102626-T, and Fondo Social de la DGA (grupos DGA).