摘要
利用离子凝胶法,以三聚磷酸钠(TPP)为交联剂,由壳聚糖(CS)制备了CS/TPP纳米微胶囊.用红外光谱仪、扫描电镜和粒径分析仪进行了表征,并以牛血清蛋白(BSA)作为模型药物,考察了所制备的CS/TPP纳米微胶囊的包载和缓释性能.结果表明,CS/TPP纳米微胶囊的红外光谱相对于CS和TPP的红外光谱发生了很大变化,说明CS和TPP通过正负电荷吸引聚合成囊;粒径分析表明,离子凝胶法可以得到粒径约430 nm的均匀分散的壳聚糖纳米微胶囊,经冷冻干燥后粒径变为300 nm左右;微胶囊包封率最高可达79.74%,模型药物的持续释放时间可达7 d以上.
Chitosan/sodium tripolyphosphate（CS/TPP） nano-sized microcapsules were prepared with ionic gelation of CS with TPP. The obtained CS nano-sized microcapsules were characterized with the infrared spectra（IR）, scanning electron microscope （SEM） and the particle size analyzer. The model protein, bovine serum albumin（BSA） as a model drug, was encapsulated into the CS/TPP nano-sized microcapsules. Infrared spectrum of CS/TPP nano-sized microcapsules indicated that CS was cross-linked with TPP. The average di- ameter of the obtained nano-sized microcapsules was around 430 nm, and a homogeneous size distribution and good dispersion were observed. BSA-loading efficiency of CS/TPP nano-sized mierocapsules did not increase with the increase in concentration of CS. When mass fraction of CS was 0.25% , the highest BSA-loading efficiency of CS/TPP nano-sized microcapsules reached 79.74%, while BSA continually and smoothly released up to one week.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2009年第3期625-628,共4页
Chemical Journal of Chinese Universities
基金
国家重点基础研究发展计划(批准号:2007CB936104)
国家自然科学基金(批准号:60121101
60571032
90606027)资助
关键词
壳聚糖
三聚磷酸钠
药物缓释
Chitosan （CS）
Sodium tripolyphosphate （TPP）
Drug-releasing
