溃康结肠靶向微丸靶向性评价研究

目的：探索大鼠胃肠药物浓度测定评价溃康结肠靶向微丸的可行性。方法：HPLC测定黄芩苷和黄芩素的含量，比较给药3 h和6 h后，靶向微丸和普通微丸在大鼠胃肠道中药物浓度差异。结果：给药3 h后，靶向微丸组大鼠胃肠道中黄芩苷原形的回收率约70%，明显高于普通微丸组(约20%)，微丸形状完整，大部分集中于小肠下段，表明其释药部位为小肠下段或结肠；6 h后，药物以黄芩素形式分布于大肠，证明制剂释药完全。结论：在体测定胃肠道中黄芩苷的残余量，适用于溃康结肠靶向微丸的靶向性评价。该制剂能使药物达到结肠靶向给药效果。

Evaluation of targeting property for Kuikang colon targeted pelletsZHANG Ya-jun1, LI Jiang-ying2, XU Lian-ying3

OBJECTIVE: To evaluate colon targeting characteristic of Kuikang colon targeted pellets (KCP) with determination of residual baicalin and baicalein concentration in gastrointestinal tract (GIT). METHOD: The baicalin and baicalein were assayed by HPLC. The recovery differences of the drug between KCP and conventional pellets from GIT were investigated, three and six hours after administration. RESULT: The baicalin recovery of KCP (70%) from rat GIT was higher than that of CP (about 20%). Most of KCP were intact at 3 h after oral administration, and distributed in lower ileum. It indicated that release site of KCP was in lower ileum and colon. Six hours later, a small amount of baicalin was recovered in intestime, which showed that the release of baicalin from KCP was complete. CONCLUSION: The determination of residual baicalin in rat GIT was feasibility for evaluating KCP. The result confirmed KCP of colon targeting property.