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外翻肠囊法研究芍药苷脂质液晶纳米粒肠吸收特性
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摘要
为研究芍药苷脂质液晶纳米粒(Pae-LLCN)在大鼠不同肠段的吸收动力学特征,并与芍药苷(Pae)溶液进行比较,本实验采用离体肠外翻模型进行肠吸收实验,高效液相色谱法测定Pae的含量,研究Pae-LLCN在大鼠十二指肠、空肠、回肠、结肠的吸收状况,并考察不同质量浓度对肠吸收的影响。结果显示,Pae-LLCN与Pae在不同浓度不同肠段均有吸收,且各肠段的吸收速率常数Ka随着药物的浓度的增加而增加,具有明显的浓度依赖性,提示其可能为被动吸收;Pae-LLCN各肠段的累积吸收量Q和吸收速率常数Ka均高于Pae(P<0.05)。结果表明,Pae-LLCN与Pae在整个大鼠小肠均有吸收,吸收机制可能为被动吸收;LLCN能显著改善Pae的肠吸收。
To study the absorption kinetics of paeoniflorin lipid liquid crystalline nanoparticles(Pae-LLCN) in rat different intestinal segments and compared with the absorption of paeoniflorin(Pae) solution,rat everted gut sac was adopted and Pae was determined by HPLC to study the absorption characteristics of Pae-LLCN in rat duodenum,jejunum,ileum and colon,and investigate the influence of drug concentrations on intestinal absorption.Results showed Pae-LLCN and Pae were well absorbed at different intestine segment and different concentrations.The Ka increased with increasing of the drug concentration indicating passive absorption.The Q and Ka of Pae-LLCN were markedly higher than those of Pae at each intestinal segment(P<0.05).The results revealed that Pae-LLCN and Pae could well be absorbed in whole intestinal segments and its mechanism may be passive absorption.LLCN can effectively improve the intestinal absorption of Pae.
引文
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