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Title: Flux Tracking in delivery polymeric systems
Authors: Ferreira, J. A. 
Oliveira, P. de 
Silva, P. M. da 
Simon, L. 
Keywords: Controlled drug delivery; Visco-elasticity; Effective time; Mathematical model
Issue Date: 2010
Publisher: Centro de Matemática da Universidade de Coimbra
Citation: Pré-Publicações DMUC. 10-13 (2010)
Serial title, monograph or event: Pré-Publicações DMUC
Issue: 10-13
Place of publication or event: Coimbra
Abstract: 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
Rights: openAccess
Appears in Collections:FCTUC Matemática - Vários

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