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- W2085754534 abstract "The intestinal absorption of two ACE inhibitors was studied to determine the potential for colonic delivery of small peptides. In addition, studies were also performed to assess intestinal tissue uptake and evaluate a canine intestinal-access-port model as techniques for screening absorption. To evaluate the impact of differences in the contributions of passive permeation and carrier-mediated peptide transport onin vitro uptake and in vivo absorption, an esterified prodrug, benazepril, and a free diacid non-prodrug, CGS 16617, were selected for study. Potential colonic absorption enhancement utilizing coadministration of Intralipid was also investigated. Studies in rat everted intestinal rings verified that jejunal benazepril uptake included a carrier-mediated component while that of the diacid did not. Uptake of both drugs was purely passive in colonic rings. Equilibrium uptake and uptake rate of the more lipophilic prodrug was 2-fold greater than the diacid. Benazepril and CGS 16617 jejunal uptake rate at 0.01 mM was 3.5 and 2.5 times higher, respectively, than from colonic rings. Following jejunal administration in dogs, maximum benazepril plasma levels (Cmax) and area under the plasma level versus time curve (AUC) were 5.5 and 3.0 times higher, respectively, than following colonic administration. Maximum benazepril plasma levels following colonic administration in dogs was 2-fold greater than for CGS 16617, consistent with in vitro results. Colonic coadministration of the poorly-absorbed CGS 16617 with 2 mL of Intralipid (within dietary range for fecal fat content) enhanced Cmax and AUC 2.5- and 3.5-fold, respectively, in the dog and AUC 1.5-fold in the rat. Morphological and biochemical studies showed that Intralipid did not damage rat jejunal or colonic epithelium in situ." @default.
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- W2085754534 date "1994-09-01" @default.
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- W2085754534 title "Absorption of Ace Inhibitors from Small Intestine and Colon" @default.
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- W2085754534 doi "https://doi.org/10.1002/jps.2600830929" @default.
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