Synthesis and biodegradation of nanogels as delivery carriers for carbohydrate drugs

Biodegradable nanogels loaded with rhodamine B isothiocyanate-dextran (RITC-Dx) as a model for watersoluble biomacromolecular drugs were prepared using atom-transfer radical polymerization (ATRP) in a cyclohexane inverse miniemulsion in the presence of a disulfide-functionalized dimethacrylate cross linker. UV-vis spectroscopy was used to characterize the extent of incorporation of RITC-Dx into the nanogels. The loading efficiency of RITC-Dx into the nanogels exceeded 80%. These nanogels were degraded into polymeric sots in a reducing environment to release the encapsulated carbohydrate drugs. The released carbohydrate biomolecules specifically interacted with concanavalin A in water, suggesting that the biodearadable nanogels could be used as carriers to deliver carbohydrate drugs that can be released upon degradation to bind to pathogens based on lectins.