Fig. 6From: Caffeine-folic acid-loaded-chitosan nanoparticles combined with methotrexate as a novel HepG2 immunotherapy targeting adenosine A2A receptor downstream cascadeThe hydrodynamic zeta potential (mV) of the optimal formulations of CS-NPs (A), CAF-CS-NPs (B), FA-CS-NPs (C), and CAF-FA-CS-NPs (D)Back to article page