Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/67820
Type: Artigo de periódico
Title: Gastro-Resistant Controlled Release of OTC Encapsulated in Alginate/Chitosan Matrix Coated with Acryl-EZE (R) MP in Fluidized Bed
Author: Kleinubing, SA
Seraphim, DC
Vieira, MGA
Canevesi, RLS
da Silva, EA
Cesar, CL
Mei, LHI
Abstract: A gastro-resistant system of acryl-EZE (R) MP coated alginate/chitosan microparticles was developed to improve the controlled release of oxytetracycline (OTC). Microparticles were obtained by complex coacervation and, thereafter, were coated using fluidized polymer dispersion with acryl-EZE (R) MP solution. OTC distribution inside the microparticles was determined by multiphoton confocal microscopy, demonstrating the efficiency of encapsulation process. In vitro OTC release kinetic was performed in order to obtain the release profile in gastric and intestinal simulated fluids. A fast initial release, or burst effect, was observed with uncoated microparticles loaded with OTC in gastric conditions. When a 50% mass increase in acryl-EZE (R) MP coating was achieved, OTC release in acidic medium was greatly reduced, resulting in the expected gastro-resistant effect. Different mathematical models were applied to describe the drug diffusion across the polymer matrix. The Logistic model was the best tool to interpret the experimental data in most of the systems studied. (c) 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40444.
Subject: drug delivery systems
coatings
biomaterials
biomedical applications
Country: EUA
Editor: Wiley-blackwell
Rights: fechado
Identifier DOI: 10.1002/app.40444
Date Issue: 2014
Appears in Collections:Unicamp - Artigos e Outros Documentos

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