Started from the liver targeting compounds（glycyrrhizin,glycyrrhetinicacid,bile acid）,six（amine-terminated） compounds were prepared via two-step reactions.The NMR experiments provided the direct evidence of the existence of amide.The polymers were synthesized by polymerizing of BLG-NCA initiated by each of six amine-terminated compounds.The liver targeting group was introduced to the main chain of the polymer.The molecular weight of the resultant polymers was adjusted by changing the molar ratio of monomer BLG-NCA to initiator.The product structure was characterized by GPC,FTIR and（）1H NMR.The results demonstrate that amine-terminated compounds containing liver targeting group could initiate the polymerization of BLG-NCA.
Chitosan derivative with glycyrrhetinic acid(GA),which was accumulated specifically in liver,was synthesized.By ion-crosslinking of TPP in GA-CTS solution,GA-CTS-TPP complex nanoparticles were obtained.The physicochemical properties of these nanoparticles were investigated by using TEM and DLS.The experiment in vitro BSA entrapped was studied.GA-CTS-TPP nanoparticles are well dispersed and stable in aqueous solution in 14 months.
