摘要
Previous study has shown that 10-hydroxycamptothecin（HCPT） has well-established pharmacological effects in vitro.However,its in vivo bioavailability is very poor due to various problems,which severely restricts its clinical applications.In the present study,phospholipid complex（PC） technology was employed to improve the solubility and bioavailability of HCPT.XRD data confirmed the formation of HCPT-PC.However,our previously prepared HCPT-PC is too sticky,which may result in the slow dissolution rate and negative effects on its absorption.Therefore,we prepared HCPT-PC-solid dispersion（HCPT-PC-SD）and lipid-based formulations of HCPT-PC through simple preparation process.The results showed that the dissolution rate of HCPT-PC was effectively improved by solid dispersion technology,which reached 91.73%in 45 min.Pharmacokinetic study revealed that the AUC_（0-t） of HCPT-PC-SD and HCPT-PC lipid-based formulations was effectively further increased compared with HCPT-PC.Moreover,we found that the combination of SD technology and lipid-base formulations could be a promising drug-delivery system to improve the oral bioavailability of HCPT-PC.In addition,we showed that the bioavailability of HCPT-PC lipid-base formulations was even greater than that of HCPT-PC-SD.In particular,lipid-base formulations could be prepared just by a simple method,suggesting its feasibility of industrialization.
羟基喜树碱在体外具有确切的药理作用,但是由于自身的各种原因导致其体内生物利用度很低,限制了在临床上的应用。本文采用磷脂复合物技术改善其溶解性能并提高生物利用度。X-衍射实验确定了羟基喜树碱磷脂复合物(HCPT-PC)的形成。但是磷脂复合物粘性较大,影响了药物的溶出进而不利于药物的吸收。为了改善磷脂复合物粘性较大的问题,通过简单的制备工艺制备了HCPT-PC固体分散体(HCPT-PC-SD)和油制剂(HCPT-PC-lipid-based formulations)。结果显示,固体分散体技术大大改善了HCPT-PC中药物的溶出速率,在45 min内溶出度达到91.73%。药动学研究结果显示,与HCPT-PC相比,HCPT-PC-SD和油制剂的AUC_(0-t)得到进一步提高。因此,固体分散体和油制剂是进一步提高HCPT-PC生物利用度的有研究前景的给药系统。HCPT-PC油制剂生物利用度与HCPT-PC-SD相比,提高效果更为明显。而且由于HCPT-PC油制剂的制备工艺简单,有利于实现工业化生产。
基金
Science and Technology Department of Henan province Fund Project(Grant No.144300510019)
