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EVALUATION OF THE IBUPROFEN DELYVERY PROFILE IN SYMMETRIC AND ASYMMETRIC MEMBRANES OF CELLULOSE ACETATE: EFFECT OF MORPHOLOGY. Cellulose derivatives still receive special attention in today biomedical applications due to their biocompatibility, ability to form resistant membranes and compatibility with various bioactive agents. In this work, cellulose acetate (CA) was used to prepare membranes with different morphologies aiming to evaluate the release profile of the drug ibuprofen (IBF). The IBF incorporation was performed by the addition of 10% of the drug in an 8% (w/w) CA/acetone solution. The morphology of the membranes was modified by the addition of water, used as porogenic agent. Drug release assays showed the effect of morphology on the cumulative drug release curves. The symmetric membrane exhibited retention of significant amounts of the drug and a slow release process that lasted for more than 50 hours. The asymmetric porous membranes presented different behavior with greater amount of drug released in less time of release. The kinetic parameters calculated from the Higuchi and Korsmeyer/Peppas models indicated release profiles controlled by diffusion/solution process in the polymer matrix. The results revealed that the interactions established between IBF, CA and the matrix morphology are significant factors for the kinetic control of the drug release process and enable to choose different applications of the membranes loaded with IBF.

AVALIAÇÃO DO PERFIL DE LIBERAÇÃO DO FÁRMACO IBUPROFENO EM MEMBRANAS SIMÉTRICAS E ASSIMÉTRICAS DE ACETATO DE CELULOSE: EFEITO DA MORFOLOGIA