Fig. 4From: Rhein laden pH-responsive polymeric nanoparticles for treatment of osteoarthritis% Cell viability of THP-1 cell exposed to concentrations 25 µg/ mL and 50 µg/mL of control, Rh-PLGA-NPs and Rh-PLGA-NPs@NH4 (n = 06). (*p < 0.01; Rh-PLGA-NPs@NH4 vs. Rh-PLGA-NPs, # p < 0.05; Rh-PLGA-NPs@NH4 vs. Rh-PLGA-NPs)Back to article page