<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Rinaki, E</style></author><author><style face="normal" font="default" size="100%">Dokoumetzidis, A.</style></author><author><style face="normal" font="default" size="100%">Macheras, P.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">The mean dissolution time depends on the dose/solubility ratio</style></title><secondary-title><style face="normal" font="default" size="100%">PHARMACEUTICAL RESEARCH</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Dissolution</style></keyword><keyword><style  face="normal" font="default" size="100%">dose/solubility ratio</style></keyword><keyword><style  face="normal" font="default" size="100%">mean dissolution time</style></keyword><keyword><style  face="normal" font="default" size="100%">Solubility</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2003</style></year><pub-dates><date><style  face="normal" font="default" size="100%">MAR</style></date></pub-dates></dates><number><style face="normal" font="default" size="100%">3</style></number><publisher><style face="normal" font="default" size="100%">KLUWER ACADEMIC/PLENUM PUBL</style></publisher><pub-location><style face="normal" font="default" size="100%">233 SPRING ST, NEW YORK, NY 10013 USA</style></pub-location><volume><style face="normal" font="default" size="100%">20</style></volume><pages><style face="normal" font="default" size="100%">406-408</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Purpose. To investigate the relationship between mean dissolution time (MDT) and dose/solubility ratio (q) using the diffusion layer model. Methods. Using the classic Noyes-Whitney equation and considering a finite dose, we derived an expression for MDT as a function of q various conditions. q was expressed as a dimensionless quantity by taking into account the volume of the dissolution medium. Our results were applied to in vitro and in vivo data taken from literature. Results. We found that MDT depends on q when q &lt; 1 and is infinite when q &gt; 1 and that the classic expression of MDT = 1/k, where k is the dissolution rate constant, holds only in the special case of q = 1. For the case of perfect sink conditions, MDT was found to be proportional to dose. Using dissolution data from literature with q &lt; 1, we found better estimates of MDT when dependency on dose/solubility ratio was considered than with the classic approach. Prediction dissolution limited absorption was achieved for some of the in vivo drug examples examined. Conclusion. The mean dissolution time of a drug depends on dose/solubility ratio, even when the model considered is the simplest possible. This fact plays an important role in drug absorption when absorption is dissolution limited.</style></abstract><work-type><style face="normal" font="default" size="100%">Article</style></work-type></record></records></xml>