Abstract
Predicting the fraction of an oral dose absorbed in humans is of considerable interest at an early stage of a research program in the pharmaceutical industry. Models described in the literature to predict the oral absorption in man include: the permeability in Caco-2 cells, absorption from a perfused segment of rat intestinal lumen and uptake into everted rings. The present study used an isolated and vascularly perfused rat small intestine to determine the permeability values of eleven compounds across the intestinal epithelium. A good correlation was obtained between the permeability values determined in this model and the proportion of an oral dose absorbed in humans. Compared to the other models, the present one could allow the appearance in the artificial bloodstream and the intestinal metabolism of a compound to be studied simultaneously.
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