Chiang et al. synthesized HPMA polymer–coated liposomes to target tumor pHex [98]. Theysynthesized a pH-sensitive polymer as methoxy-PEG5000-b- (HPMA-co-histidine)-cholesterolbearing polyhistidine groups and used to coat the surface of the liposomes. These liposomeswere then sealed with another polymer, biotin-PEG-biotin, by crosslinking of biotin (-C=O)groups with the imidazole ring of histidine via hydrogen bonding to prevent drug leakage. Theliposomes were found to be stable at pH 7.4 with a release profile of less than 20% over 24hours.
đang được dịch, vui lòng đợi..
