@article{oai:dwcla.repo.nii.ac.jp:00000723,
author = {伊賀, 勝美 and IGA, Katsumi},
journal = {総合文化研究所紀要, Bulletin of Institute for Interdisciplinary Studies of Culture Doshisha Women’s College of Liberal Arts},
month = {Mar},
note = {AN10052143-20110331-80, Simulating an intestinal drug absorption rate through a model incorporating rates of dissolution and absorption allowed me to demonstrate that incomplete absorption of drugs exhibiting low aqueous solubility occurs because of the saturation of drug dissolution while the dose transits through the small intestine: the overall absorption rate is independent of the drug dissolution rate and can be calculated by an immediate-dissolution rate model.
Using this simple model, we can place the four drug classes as defined by the Biopharmaceutics Classification System (BCS) into the absorption-rate matrix represented by the dose number divided by the aqueous-solubility number, taking the intestinal-fluidvolume number as the vertical coordinate, the product of the first-order absorption rate as the constant, and the small intestinal-transit time as the cross coordinate.
I was also able to demonstrate that improving the absorption rate of a compound exhibiting incomplete absorption is achievable only by increasing its aqueous solubility through solid-dispersion or lipid formulations and will not occur after a nano-size reduction of the drug powders., 論文 (Article)},
pages = {80--92},
title = {難吸収性薬物の吸収性に関する評価基準とそれに基づく製剤設計},
volume = {28},
year = {2011},
yomi = {イガ, カツミ}
}