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Preparation and characterization of HPEI nanoparticles. (A) Preparation scheme, (B) transmission electron microscopic image of HPEI nanoparticles, (C) zeta potential spectrum of HPEI nanoparticles, (D) the DNA-binding ability of HPEI nanoparticles determined by gel retardation assay, (E) fluorescent image of transfected C-26 cells, and (F) transfection efficiency determined by cytometry analysis.
Abbreviation: HPEI, heparin-polyethyleneimine.
