Polyethylene imine modified ferrotetroxide magnetic nanoparticles (PEI@Fe3O4), with high specific surface area, high load and high surface charge, safety, environmental protection and pollution-free, magnetic resonance imaging contrast enhancement effect, good dispersity and stability. Polyvinyl imine modified ferrioxide magnetic nanoparticles (PEI@Fe3O4) are brown clarified hydrocolloid, which have been filtered by 0.22 micron membrane for sterilization, simple operation, easy to be phagocytic, and can be used for DNA or RNA cell transfection experimental studies.

Experimental study on cell transfection of DNA or RNA