In certain embodiments, this disclosure relates to nanoparticles for drug-delivery of cytotoxic anti-cancer compounds. In certain embodiments, the nanoparticle comprises a maytansinoid and an acetalated polysaccharide-polyethylene glycol conjugate. This disclosure also relates to methods for treatment of infection and cancer are also claimed, wherein a cytotoxic compound is en capsulated in a nanoparticle is degraded at the intended target, but otherwise stable, releasing the cytotoxic compound. Compositions comprising the nanoparticles and cytotoxic drugs are also considered.
