以1-乙基-(3-二甲基氨基丙基)碳酰二亚胺(EDC)为催化剂,将脱氧胆酸接枝到壳聚糖主链的氨基上,得到疏水改性的双亲性壳聚糖;再将叶酸连接于壳聚糖氨基,可得到具有肿瘤靶向潜力的双亲性共聚物.利用红外光谱、1H核磁、X射线晶体衍射图谱对其结构进行表征.脱氧胆酸-壳聚糖、叶酸-壳聚糖-脱氧胆酸在水相中通过透析处理均能形成自聚集体,利用荧光探针技术研究其自聚集行为.制得的两种自聚集体均具有较低的临界胶束浓度(10-2mg/ml),透射电镜和粒径分析测试显示制得的自聚集体为纳米级颗粒.随着脱氧胆酸取代度的增加,粒径降低,临界胶束浓度下降,但叶酸直接偶联壳聚糖导致自组装阻力增加.
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