摘要
本文筛选胸腺五肽多囊脂质体(TP5-MVL)的处方和制备工艺,并进行其体外释放性能考察和大鼠体内药物代谢动力学评价。采用复乳法制备TP5-MVL,L9(34)正交实验设计进行处方筛选和优化,分别以pH7.4 PBS和血浆为释放介质考察TP5-MVL的体外释放特性。制备异硫氰酸荧光素标记的胸腺五肽(FITC-TP5)多囊脂质体(FITC-TP5-MVL),初步考察肌内注射FITC-TP5-MVL后大鼠体内的药物代谢动力学。优化后的TP5-MVL处方为水相葡萄糖,浓度为7.5%,油相中三油酸甘油酯为2.25 mol.L-1,DPPG为2.68 mol.L-1,DOPC为16.96 mol.L-1,制备的TP5-MVL包封率均在85%以上,测得的平均粒径为22μm,TP5-MVL在0.02 mol.L-1pH7.4 PBS溶液中5 d累计释放超过85%,在血浆中释放较快。在PBS(pH7.4)和血浆中TP5-MVL的释药曲线最符合Higuchi方程。大鼠肌内注射FITC-TP5-MVL后,与注射相同剂量FITC-TP5溶液相比,药物的达峰浓度显著降低,消除时间明显延长,120 h血浆中仍可检测到药物。复乳法制备的TP5-MVL工艺可行,重现性好,且包封率高,大鼠药物代谢动力学结果表明TP5-MVL具有显著的缓释特性。
To optimize the formulation and preparation method of muhivesicular liposome of thymopentin and to investigate its pharmacokinetics in rats, the muhivesicular liposome of thymopentin was prepared by double emulsification method and the formulation was optimized by orthogonal design. The release characteristics of thymopentin from multivesicular liposome in PBS （ pH 7.4） and in plasma were investigated. The multivesicular liposome of thymopentin labeled with fluorescein isothiocyanate was prepared by double emulsification method. Its pharmacokinetics was evaluated following intramuscular injection in rats. The optimal formulation of multivesicular liposome of thymopentin were formulated with 7.5% glucose in aqueous phase and 2.25 mol·L^-1 triolein, 2.68 mol·L^-1 DPPG and 16. 96 mol·L^-1 DOPC in organic phase. The entrapment efficiency of the multivesicular liposome of thymopentin was above 85% and the mean particle size was about 22 μm. The in vitro release of thymopentin from multivesicular liposome in PBS （ pH 7.4） and in plasma was found to be in a sustained manner. The release curves were fitted to Higuchi equation. The pharmacokinetics following intramuscular injection of the multivesicular liposome of thymopentin labeled with fluorescein isothiocyanate in rats showed that the peak concentration of thymopentin was lower and elimination of it was slower significantly than that of thymopentin labeled with fluorescein isothiocyanate solution in the same dose. The plasma concentration of thymopentin maintained above quantitative limitation at 120 h after administration of muhivesicular liposome of thymopentin. The optimized formulation and preparation technology of muhivesicular liposome of thymopentin with higher entrapment efficiency are feasible with good reproducibility. Multivesicular liposome of thymopentin showed significant sustained-release property following intramuscular injection in rats.
出处
《药学学报》
CAS
CSCD
北大核心
2008年第7期756-760,共5页
Acta Pharmaceutica Sinica
关键词
胸腺五肽
多囊脂质体
药代动力学
异硫氰酸荧光素
thymopentin
muhivesicular liposome
pharmacokinetics
fluorescein isothiocyanate
