目的 制备黄藤素柔性纳米脂质体(PFNL),并考察其药剂学性质与体外透黏膜给药的行为特点,为进一步应用奠定基础。方法 以薄膜分散法制备黄藤素柔性纳米脂质体,采用鱼精蛋白凝聚与高效液相色谱仪测定包封率,考察卵磷脂、胆固醇与丙二醇对脂质体包封率的影响;用透射电镜(TEM)、光子相关光谱仪(PCS)与激光共聚焦显微镜(CLSM)评价脂质体的粒径和结构;通过测定脂质体透过微孔滤膜的相对速率评价其变形性;用恒温电导率法测定脂质体的凝聚速度常数(K)以评价其物理稳定性。采用水平双室扩散池考察黄藤素柔性纳米脂质体通过猪阴道黏膜的给药行为,并考察其对大鼠阴道组织中细胞因子SLPI、LF和SP-D表达的影响,与黄藤素普通脂质体(PCL)及其溶液剂(PL)进行对比。 结果 卵磷脂、胆固醇和丙二醇的质量分数分别为3%、0.02%、20%时,制备的黄藤素柔性纳米脂质体对黄藤素的包封率为(78±2.13)%;黄藤素柔性纳米脂质体为圆形或椭圆形的多层状囊泡结构,粒径为(185±19) nm,Zeta电位为(-53±2.27) mV,变形性为(79±5.75)%;黄藤素柔性纳米脂质体K值始终低于黄藤素的普通脂质体的K值。6.0 h时,黄藤素柔性纳米脂质体的药物累积透过量分别为黄藤素的普通脂质体和其溶液剂的1.53与2.86倍,且药物在阴道组织中的滞留量也高于黄藤素的普通脂质体和其溶液剂;黄藤素柔性纳米脂质体不影响大鼠阴道组织中SLPI、LF和SP-D表达,组织切片未显示异常。结论 黄藤素柔性纳米脂质体对黄藤素的包封率高、稳定性好,能够促进药物通过阴道黏膜并在黏膜组织中形成药物储库,对阴道安全无刺激,因此,可作为黄藤素阴道给药的一种新型给药载体。
Abstract
OBJECTIVE To prepare palmatine- loaded flexible nano-liposomes (PFNL) and study their pharmaceutical properties, in order to lay the foundation for the industral application. METHODS The flexible nano-liposomes were prepared by thin-film homogenization method with propyleneglycol (PG) as softening agent. The entrapment rate of palmatine was evaluated by protamine aggregation method and HPLC. The effects of concentrations of phosphatidylcholine (PSC), cholesterol (CH), and PG on the entrapment efficiency of palmatine were also investigated. The pharmaceutical properties of PFNL were evaluated by TEM, PCS and CLSM. The deformation of PFNL was determined by its relative rate of permeating the microporous filter membrane. The coagulation rate constant (K) was measured by constant temperature conductivity method. The side-by-side diffusion cells and pig vaginal mucosa were used to investigate the characteristics of the release of palmatine from PFNL in vitro, and the effects of PFNL on the expression of cytokines (SLPI, LF and SP-D) were investigated and compared with classic liposomes and lotion of palmatine. RESULTS The palmatine entrapment efficiency was (78±2.13)% when the PFNL were prepared with PSC (3%), CH (0.02%), and PG (20%). The prepared nano flexible liposomes had a closed spherical or elliptical shape and appeared as multi-lamellar vesicles under the TEM and CLSM.The calculated mean size was (185±19) nm, and the Zeta potential was (-53±2.27) mV. The deformation of PFNL was (79±5.75)%. The coagulation rate constant (K) of PFNL was always lower than that of traditional palmatine- loaded liposomes. The accumulated permeation amount of palmatine from the PFNL at 6.0 h was 1.53 and 2.86 folds of those of classic liposomes and lotion, respectively. Moreover, the expressions of cytokines (SLPI, LF and SP-D) in female SD rats after being treated with PFNL, PCL and PL were similar to that of the control group. CONCLUSION The prepared PFNL have high encapsulation efficiency, good stability and safety, and greatly increase the vaginal mucosa permeability of palmatine. Flexible nano-liposomes may be a useful drug delivery carrier for the gynecological application of palmatine.
关键词
黄藤素 /
柔性纳米脂质体 /
药剂学性质 /
透黏膜给药
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Key words
palmatine /
flexible nano-liposome /
pharmaceutical property /
across mucosa administration
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中图分类号：
R944
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脚注
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基金
国家自然科学基金资助项目(81303231);陕西省自然科学基础研究计划(2014JQ4145)
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