Fig. 4From: Triphenyl Phosphine-Functionalized Chitosan Nanoparticles Enhanced Antitumor Efficiency Through Targeted Delivery of Doxorubicin to MitochondriaFluorescence spectrum quantitative analysis of free Dox and Dox-loaded TPP-NPs in A549 (a) and Hela cells (b). Data are presented as means ± SD (n = 3). *P < 0.05 vs Dox-loaded TPP-NPs treated with cells at 3 hBack to article page