Almeida, Luís Pereira deBrito, PauloSousa, AnabelaPortugal, AntónioFigueiredo, Maria Margarida Lopes2010-01-142010-01-141997Almeida, Luís Pereira de; Brito, Paulo; Sousa, A.; Portugal, António; Figueiredo, Margarida (1997). Modelling dissolution of sparingly soluble powders. In European Symposium on Formulation of Poorly-Available Drugs for Oral Administration. Paris. p. 243-246.http://hdl.handle.net/10198/1284The present work deals with the simulation of the dissolution process of polydisperse powders. Three different size fractions of Ibuprofen were used to develop a model which assumes a diffusion layer thickness proportional to the particle diameter, up to a critical value, beyond which it is considered constant. The application of the resultant integrated equations to each size class of the primary particle size distribution leads to an almost perfect agreement between simulated and experimental dissolution profiles.engconference object