Flux Tracking in delivery polymeric systems

The dynamics of diffusive and stress-induced transport in polymeric delivery systems was investigated. Partial and ordinary differential equations were first written to describe drug release behaviors in Maxwell and Maxwell-Voigt materials. The time constants governing the flux and concentration res...

ver descrição completa

Detalhes bibliográficos
Autor principal: Ferreira, J. A. (author)
Outros Autores: Oliveira, P. de (author), Silva, P. M. da (author), Simon, L. (author)
Formato: other
Idioma:eng
Publicado em: 2010
Assuntos:
Texto completo:http://hdl.handle.net/10316/13703
País:Portugal
Oai:oai:estudogeral.sib.uc.pt:10316/13703
Descrição
Resumo:The dynamics of diffusive and stress-induced transport in polymeric delivery systems was investigated. Partial and ordinary differential equations were first written to describe drug release behaviors in Maxwell and Maxwell-Voigt materials. The time constants governing the flux and concentration responses of a permeating species were determined from a Laplace transform solution of the original model. A ”tracking strategy”, based on the estimated characteristic times, was proposed to estimate the delivery rate and the concentration near the exit side of the membrane. The methodology was more efficient at times greater than the time constant and the prediction error decreased further as the process approached steady state. Numerical illustrations and comparisons made with published data show the effectiveness of the proposed approach in describing the influence of the Young modulus, viscosity and relaxation time on the transient regime