An Experimental Study on Homoharringtonine Liposome and Glaucoma Filtration Surgery

Purpose: To observe the inhibitory action of homoharringtonine liposome during the healing process of wounds in the filtering sitesMethods: posterior sclerectomies were performed in 14 rabbits. Postoperatively one eye of each rabbit received subconjunctival injections of HH liposome and fellow eye received saline injection in a randomized masked fashion.Results; Fourteen days after operation the IOP of experimental eyes reduced significantly (P < 0.01) as compared with the controlled eyes, and the number of remaining filtering blebs increased noticeably (P< 0.05). Pathohistological examination revealed that the number of fibroblasts per square micron in the filtering sites and the thickness of the scars in the center of the filtering sites of the experimental eyes were less than those of the controlled eyes. No serious ocular toxic and side effects were found.Conclusion : This experiment suggests that homoharringtonine liposome can markedly inhibit the scar formation of filtering sites after glaucoma fi     

Effect of Liposome—Encapsulated Total Alkaloid of Harmaline on Rabbit Lens Epithelial Cells：Experimental Study on the Prevention of Posterior Capsule Opacification

Purpose: To investigate whether liposome encapsulated total alkaloid of Harmaline (TAH) as a therapeutic agent is beneficial to prevention of posterior capsular opacifi-cation (PCO).Methods: Liposome-encapsulated TAH was prepared by modified freeze-thawing method. 0. 1ml of liposome-encapsulated TAH (0. 2mg/ml) was injected into the capsular bag during extracapsular lens extraction (ECLE) of each eye in total 10 rabbit eyes. Blank liposome or balance salt solution (BSS) was used as control. Slit-lamp examination and histopathological examination was used to evaluated capsule opacifica-tion. Intraocular pressure (IOP) , density and morphology of corneal endothelia cells, the amplitude and latency of b wave of ERG were measured.Results: The inflammatory response was mild both in TAH treated and the control group. PCO formation occurred in the control group 2 weeks postoperatively, but the posterior capsule was clear in TAH treated eyes. 4 weeks and 8 weeks after operation, PCO occurred both in TAH treated     

丁胺卡那霉素地塞米松复方脂质体在兔眼玻璃体内的药代动力学研究

目的 应用丁胺卡那霉素地塞米松(丁卡地塞)复方脂质体玻璃体内注射以延长两种药物的半衰期.方法 大白兔随机分4组,正常眼2组和眼内炎眼2组均分别注射复方脂质体和游离药物.结果 丁卡在正常眼复方脂质体的半衰期较游离药物延长1.8倍,在眼内炎眼延长3.4倍.地塞在正常眼复方脂质体半衰期较游离药物延长22.5倍,在眼内炎眼延长46.2倍.结论 丁卡地塞复方脂质体玻璃体内注射使丁卡和地塞两种药物的半衰期有明显延长.     

荧光素钠阳离子脂质体的制备及向金黄色葡萄球菌转运的效率

目的　制备向革兰阳性细菌内有效转运药物的阳离子脂质体。方法　以荧光素钠为标志检测对象 ,以大豆磷脂、胆固醇、阳离子脂质为原料 ,依次进行旋转蒸发 -薄膜水化、超声分散、过膜挤压、冻干 ,制备荧光素钠阳离子脂质体。测定该脂质体的包封率和体外释药规律 ,流式细胞术 (FASC)检测该脂质体向金黄色葡萄球菌内转运的效率。结果　所得脂质体水合后粒径均匀 ,形态完整、规则 ,粒径范围 2 0～ 5 0nm ;3批脂质体的平均包封率为 19.4 2 %± 0 .31% ;体外释药呈现一级动力学规律 ,释药方程为Q =2 .82 93+2 .70 92T(r=0 .9839) ;FASC结果表明所制备的阳离子脂质体向细菌内转运率达 30 .1%± 12 .5 %。结论　制备的阳离子脂质体能够有效地向革兰阳性细菌内转运 ,可作为向细菌内递药的良好载体     

中药载体制剂的研究进展

总结近年来中药载体制剂的研究工作和文献报道，综述了有关脂质体、微粒、毫微粒、乳剂等作为载体在中药制剂中的应用。     

齐多夫啶半乳糖神经酰胺脂质体的制备及理化性质研究

目的 制备齐多夫啶半乳糖神经酰胺脂质体并对其理化性质进行研究。方法 采用两次乳化法，以半乳糖神经酰胺为主要膜材制备齐多夫啶半乳糖神经酰胺脂质体并进行形态学观察、检测其包封率和稳定性。结果 透射电子显微镜下观察齐多夫啶半乳糖神经酰胺脂质体为粒径均匀的球形或近球形的小单层颗粒；粒径范围为60～270nm，D50为140nm；包封率达72．5％，但10d后快速下降。结论 齐多夫啶半乳糖神经酰胺脂质体制备方法可行，需进一步提高包封率和稳定性。     

大肠癌特异性卡莫氟免疫脂质体的体外抗癌活性研究

目的研制抗人体大肠癌的单克隆抗体的卡莫氟免疫脂质体 ,并对其体外抗癌活性进行了研究。方法由偶联剂将抗大肠癌的单抗与载药脂质体偶联制成免疫脂质体 ,并应用酶联免疫吸附法和MTT法分别测定其免疫活性和体外细胞毒毒性。结果脂质体稳定性良好 ,制成免疫脂质体后 ,单抗免疫活性不丧失 ;体外细胞毒实验结果显示 ,卡莫氟免疫脂质体对人大肠癌细胞的体外抗癌活性优于普通脂质体和游离药物 ,IC50 分别为两者的 1 0 6和 3 5 9倍 ,对非靶细胞的作用与普通脂质体相似。结论卡莫氟免疫脂质体对细胞生长的抑制作用有明显的靶向特异性     

脂质体肺部给药的研究

由于脂质体肺部给药具有刺激性小、吸收迅速、生物利用度高、安全性好、可实现持续缓慢释药等独特优势而成为近年来制剂领域的研究热点之一。本文论述脂质体肺部给药的特点、稳定性以及在药代动力学、药效学和安全性等方面的最新研究进展。     

磷脂类皮肤载体给药系统的研究进展

<正> 由于磷脂本身结构与人类皮肤脂质有高度的相似性,故其具有组织亲和力强、生物降解性好、无毒性等优点,已被越来越广泛地用于皮肤载体给药系统的研究中。本文综合考察了近年国内、外对磷脂类皮肤载体给药系统的最新研究进展,包括磷脂自身的特性及其相关的皮肤载体给药系统如脂质体、传递体、药物磷脂复合物等的发展,并对其作用特点与机制等加以探讨,以期为进一步研究开发此类制剂提供参考。1 磷脂的特性1.1 磷脂的分类和理化性质 磷脂可分为天然磷脂(如卵磷脂、豆磷脂)和合成磷脂(如     

硫唑嘌呤脂质体的研制

目的 :优选硫唑嘌呤脂质体的处方和制备工艺 ,并评价其质量。方法 :采用薄膜 -振荡分散法制备硫唑嘌呤脂质体 ,以正交试验法优选出制备硫唑嘌呤脂质体的最佳工艺条件。用滴定法测其包封率 ,显微镜法观察其形态 ,测量粒径和粒度分布。结果 :制备的脂质体的包封率达到49 19 % ,透射电子显微镜下观察脂质体为粒径均匀的球状或近球状的多室脂质体 ,小于2 4μm的粒子占78 17 %。结论 :优选得到的脂质体处方和制备工艺合理、稳定