【摘要】 背景:将羧基引入疏水改性的多糖,使其自组装的纳米粒子带上表面电荷,有利于提高其稳定性,更好的发挥作为药物载体的优良性质。目的:观察合成胆甾醇疏水改性的羧乙基普鲁兰多糖在水溶液中的自组装行为及其纳米粒子的性质。方法:利用丙烯酸与普鲁兰多糖反应生成羧乙基普鲁兰多糖(CEP),然后按前期方法合成胆甾醇琥珀酰基N-羟基琥珀酰亚胺(CSN),最后CSN和CEP在催化剂下生成目标物。应用核磁共振仪对产物进行表征。结果与结论:通过1H-NMR分析,表明成功合成了胆甾醇疏水改性的羧乙基普鲁兰多糖,该材料在水溶液中能自组装为具有乳光的球型纳米粒子。CHS-CEP纳米粒子平均粒径为148.6nm,平均Zeta电位约为-19.9mV,在水溶液中分散度好,分布均匀,具有长期稳定性,可作为良好的药物载体。更多还原

【Abstract】 BACKGROUND:Carboxyl group is introduced to hydrophobically modify polysaccharides,which could self-aggregate to nanoparticles with some surface charges,and it is beneficial to improving their stability and performing the good properties as a drug carrier. OBJECTIVE:To synthesis cholesterol hydrophobically modified carboxyethyl pullulan(CHS-CEP),and to study their self-aggregated behavior in aqueous solution and characteristics of CHS-CEP nanoparticles. METHODS:Acrylic acid and pullulan polysaccharides could form carboxyethyl pullulan(CEP) by additive reaction.Objective material could be obtained by catalyzing CEP and CSN.The synthesized material was characterized using proton magnetic resonance(1H-NMR).The nanoparticles were prepared by dialysis to characterize the morphology,size and zeta potential by transmission electron microscopy(TEM) and dynamic laser scattering(DLS).RESULTS AND COUCLUSION:By 1H-NMR analysis,it showed that CHS-CEP was successfully synthesized and this material could self-aggregate to form nanoparticles with opalescence.The diameter of CHS-CEP nanoparticles was about 148.6 nm and their zeta potential was-19.9 mV.They could act as drug carrier due to many excellent properties such as a good dispersity in aqueous solution,even distribution and long-term stability.更多还原