Pharmacokinetics and correlation between in vitro release and in vivo absorption of bio-adhesive pellets of panax notoginseng saponins

The present study was designed to prepare and compare bio-adhesive pellets of panax notoginseng saponins(PNS) with hydroxy propyl methyl cellulose(HPMC), chitosan, and chitosan : carbomer, explore the influence of different bio-adhesive materials on pharmacokinetics behaviors of PNSbio-adhesive pellets, and evaluate the correlation between in vivo absorption and in vitro release(IVIVC). In order to predict the in vivo concentration-time profile by the in vitro release data of bio-adhesive pellets, the release experiment was performed using the rotating basket method in p H 6.8 phosphate buffer. The PNS concentrations in rat plasma were analyzed by HPLC-MS-MS method and the relative bioavailability and other pharmacokinetic parameters were estimated using Kinetica4.4 pharmacokinetic software. Numerical deconvolution method was used to evaluate IVIVC. Our results indicated that, compared with ordinary pellets, PNS bio-adhesive pellets showed increased oral bioavailability by 1.45 to 3.20 times, increased Cmax, and extended MRT. What's more, the release behavior of drug in HPMC pellets was shown to follow a Fickian diffusion mechanism, a synergetic function of diffusion and skeleton corrosion. The in vitro release and the in vivo biological activity had a good correlation, demonstrating that the PNS bio-adhesive pellets had a better sustained release. Numerical deconvolution technique showed the advantage in evaluation of IVIVC for self-designed bio-adhesive pellets with HPMC. In conclusion, the in vitro release data of bio-adhesive pellets with HPMC can predict its concentration-time profile in vivo.

三七总皂苷肠溶微囊的药代动力学及体内外相关性

目的:考察三七总皂苷(panax notoginseng saponins,PNS)肠溶微囊在Beagle犬体内的释药行为及其体内外相关性研究。方法:采用双周期交叉试验设计,6只健康Beagle犬口服市售血栓通胶囊或自制PNS肠溶微囊(胶囊型)后,用HPLC法测定血药浓度,计算两制剂的药代动力学参数,进行生物利用度比较,并对体外累积释放度和体内累积吸收百分率进行线性回归。结果:自制PNS肠溶微囊对市售血栓通胶囊的相对生物利用度为三七皂苷R1(R1)313.63%,人参皂苷Rb1(Rb1)314.35%,人参皂苷Rg1(Rg1)202.03%,上述3成分在体内的平均滞留时间均延长,R1,Rb1和Rg1的体内外相关系数分别为0.866 4,0.958 0和0.719 2。结论:自制PNS肠溶微囊与市售血栓通胶囊相比生物利用度更高,Rb1体内外相关性较好,可用一定的体外释放条件进行体内行为的预测,R1和Rg1体内外相关性较差。

三七总皂苷肠溶微丸的体内外相关性

目的:考察三七总皂苷(Panax Notoginseng Saponins,PNS)肠溶微丸在Beagle犬体内的释药行为及其体内外相关性。方法:采用双周期交叉试验设计,6只健康Beagle犬口服自制PNS普通胶囊或自制PNS肠溶微丸(胶囊型)后,用HPLC测定血药浓度,计算2种制剂的药动学参数,进行生物利用度比较,并对体外累积释度和体内累积吸收率进行线性回归。结果:自制PNS肠溶微丸对PNS普通胶囊的相对生物利用度为三七皂苷R1 520.56%,人参皂苷Rb1 367.70%,人参皂苷Rg1251.66%,上述3成分在体内的平均滞留时间均延长;R1,Rb1,Rg1的体内外相关系数分别为0.784 9,0.877 2,0.691 2。结论:自制PNS肠溶微丸与PNS普通胶囊相比生物利用度更高,在pH 6.8的缓冲液中R1,Rb1,Rg1的体内外相关性较差。