国产成人亚洲精品无码青app,白丝紧致爆乳自慰喷水,国产疯狂女同互磨高潮在线观看,jizzjizz少妇亚洲水多

Dextran catches increasing attentions as a drug carrier because of its biocompatibility,?biodegradability and ease of modification. In this study, we synthesized the derivated dextran by?grafting with 1-(3-aminopropyl) imidazole. The dextran-based nanoparticles with sizes of < 200 nm?were successfully prepared by nanoprecipitation, and its pH-sensitivities were investigated. The?samples were fully characterized by FTIR, 1H NMR, SEM, AFM and Zetasizer.