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pubmed-article:11839442pubmed:abstractTextThe aim of this study was to determine the intestinal absorption characteristics of the antiviral agent UC-781 and to optimize the experimental conditions of the in vitro system for low solubility compounds. The absorption potential of UC-781 was studied with the Caco-2 system and with the rat intestinal perfusion technique. The low solubility of UC-781 required the use of solubility/dissolution rate enhancing agents (e.g. VitE-TPGS, Gelucire 44/14). The creation of sink conditions in the receiver compartment of the Caco-2 system was a prerequisite to reliably study the transport of this poorly soluble compound. After inclusion of VitE-TPGS in the acceptor solution, UC-781 could be characterized as a class II drug of the Biopharmaceutical Classification System (low solubility, high permeation across membranes). A significant concentration-dependent decrease in transport of UC-781 was observed upon increasing the concentration of VitE-TPGS in the apical compartment. This observation contrasts to the absorption enhancing properties of VitE-TPGS, and can probably be attributed to a decrease in the concentration of free UC-781 when using higher concentrations of the solubility/dissolution rate enhancing agents. The use of Gelucire 44/14 as a solubilizing agent resulted in a batch-dependent degradation of UC-781. The inclusion of the solubility/dissolution rate-enhancing agent VitE-TPGS did not result in absorption enhancement in the intestinal perfusion technique.lld:pubmed
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pubmed-article:11839442pubmed:pagination113-9lld:pubmed
pubmed-article:11839442pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:11839442pubmed:articleTitleIntestinal absorption characteristics of the low solubility thiocarboxanilide UC-781.lld:pubmed
pubmed-article:11839442pubmed:affiliationLaboratory of Pharmacotechnology and Biopharmacy, Katholieke Universiteit Leuven, O&N, Gasthuisberg, 3000 Leuven, Belgium.lld:pubmed
pubmed-article:11839442pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:11839442pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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