Figure 6From: Folic-acid-conjugated pullulan/poly(DL-lactide-co-glycolide) graft copolymer nanoparticles for folate-receptor-mediated drug delivery Cytotoxicity of DOX-incorporated FAPuLG nanoparticles against KB cells (*, ** = p < 0.05). KB cells were pre-treated with folic acid 1 h before drug treatment, and then, cells were exposed to 50 μg/ml of DOX or nanoparticles for 4 h. Twenty-four hours later, viable cells were determined using the MTT assay.Back to article page