Amphiphilic Block Copolymers Bearing Ortho Ester Side-Chains: pH-Dependent Hydrolysis and Self-Assembly in Water
作者:Rupei Tang、Weihang Ji、Chun Wang
DOI:10.1002/mabi.200900229
日期:2010.2.11
copolymer nanoparticle has been synthesized and characterized. The amphiphilic diblock copolymer, PEG‐b‐PMYM, contains acid‐labile ortho ester side‐chains in the hydrophobic block and can self‐assemble into micelle‐like nanoparticles in water at neutral pH. Hydrolysis of the ortho ester side‐chains follows a distinct exocyclic mechanism and shows pH‐dependent kinetics, which triggers changes in nanoparticle
已经合成并表征了新型的pH响应嵌段共聚物纳米颗粒。两亲性二嵌段共聚物PEG- b -PMYM在疏水性嵌段中包含酸不稳定的原酸酯侧链,在中性pH值的水中可自组装成胶束状纳米颗粒。原酸酯侧链的水解遵循独特的环外机理,并显示出pH依赖的动力学,从而触发了纳米颗粒尺寸和形态的变化。已发现纳米颗粒在体外对细胞无毒。通过控制pH敏感的侧链水解来调节生物相容性嵌段共聚物纳米粒子的大小和形态的能力代表了一种独特的方法,可以用来提高纳米级药物递送的效率。