阿苯达唑在环糊精和胆汁盐存在下的溶解/渗透:影响口服生物利用度的因素的体外机制研究。

Dissolution/Permeation of Albendazole in the Presence of Cyclodextrin and Bile Salts: A Mechanistic In Vitro Study into Factors Governing Oral Bioavailability.

机构信息

Department of Physics Chemistry and Pharmacy, University of Southern Denmark, Odense M, Denmark.

Department of Physics Chemistry and Pharmacy, University of Southern Denmark, Odense M, Denmark.

出版信息

J Pharm Sci. 2022 Jun;111(6):1667-1673. doi: 10.1016/j.xphs.2021.11.010. Epub 2021 Nov 20.

Abstract

We aimed to understand the impact of the interplay between bile salts and cyclodextrins on the dissolution-permeation of poorly soluble drug compounds with a moderate-strong binding constant to cyclodextrin. Phase diagrams were prepared on the chosen model compound albendazole in phosphate buffer, fasted state simulated intestinal fluid (FaSSIF), and a modified fed state simulated intestinal fluid (FeSSIF) with (2-hydroxypropyl)-beta-cyclodextrin (HP-β-CD) concentrations of up to 10 % (m/m). Then we investigated the dissolution/permeation interplay of albendazole dissolved/suspended in the different media through a biomimetic barrier on a 96-well in vitro model. The apparent solubility of albendazole was enhanced by HP-β-CD and FaSSIF/FeSSIF separately. However, when albendazole was dissolved in HP-β-CD and biomimetic media together, the solubility was significantly lower than the predicted additive solubility from the solubilizing effects. It is postulated that this is due to the sodium taurocholate from the biomimetic media displacing albendazole from the hydrophobic cavity of HP-β-CD. In the permeation experiments, the highest permeation was observed at cyclodextrin concentrations able to solubilize close to the total dose of albendazole without a major surplus of solubilization capacity. Furthermore, an over-proportional permeation enhancement was observed when both, cyclodextrin and biomimetic media were present. These results indicate that the interplay between bile salts and cyclodextrins can enhance the free (molecularly dissolved) fraction of drug in solution to a greater extent than could be obtained with one of the solubilizing components alone. In conclusion, at carefully selected cyclodextrin-concentrations in combination with biomimetic media, obviously, a transient supersaturation is induced, which is made responsible for the observed major permeation enhancement.

摘要

我们旨在了解胆汁盐和环糊精之间相互作用对具有中等至强结合常数与环糊精结合的疏水性药物化合物的溶解-渗透的影响。在选定的模型化合物阿苯达唑的磷酸盐缓冲液、空腹模拟肠液(FaSSIF)和改良的进食模拟肠液(FeSSIF)中制备了相图,其中(2-羟丙基)-β-环糊精(HP-β-CD)浓度高达 10%(m/m)。然后,我们通过 96 孔板体外模型中的仿生屏障研究了溶解/悬浮在不同介质中的阿苯达唑的溶解/渗透相互作用。HP-β-CD 和 FaSSIF/FeSSIF 分别单独提高了阿苯达唑的表观溶解度。然而,当阿苯达唑溶解在 HP-β-CD 和仿生介质中时,溶解度明显低于溶解作用的预测加和溶解度。据推测,这是由于仿生介质中的牛磺胆酸钠从 HP-β-CD 的疏水性空腔中置换出阿苯达唑。在渗透实验中,在能够溶解接近阿苯达唑总剂量的环糊精浓度下观察到最高渗透,而没有大量的增溶能力过剩。此外,当同时存在环糊精和仿生介质时,观察到渗透增强不成比例。这些结果表明,胆汁盐和环糊精之间的相互作用可以比单独使用一种增溶成分更有效地提高溶液中药物的自由(分子溶解)分数。总之,在仔细选择的环糊精浓度与仿生介质结合的情况下,显然会诱导瞬时过饱和,这是观察到的主要渗透增强的原因。

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