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Confocal images of HeLa cells incubated with a) free DOX, b) BPQDs–PEG/DOX, c) BPQDs–PEG–FA/DOX, and d) BPQDs–PEG–FA/DOX+free folic acid after incubation for 2 h. Relative viability of HeLa cells after treatment with DOX and different NPs for e) 24 and f) 48 h. Reproduced with permission.[ 81 ] Copyright 2019, Molecular Diversity Preservation International.
