Industrial Crops and Products

Autor: Rodrigues Filhoa, Guimes, Ribeiro, Sabrina Dias, Meireles, Carla da Silva, Silva, Leandro Gustavo da, Ruggiero, Reinaldo, Ferreira Júnior, Moacir Fernandes, Cerqueira, Daniel Alves, Assunção, Rosana Maria Nascimento de, Zeni, Mara, Polleto, Patricia
Jazyk: angličtina
Rok vydání: 2011
Předmět:
Zdroj: Repositório Institucional da UFBA
Universidade Federal da Bahia (UFBA)
instacron:UFBA
ISSN: 0926-6690
DOI: 10.1016/j.indcrop.2010.10.037
Popis: Acesso restrito: Texto completo. p. 566–571. Submitted by JURANDI DE SOUZA SILVA (jssufba@hotmail.com) on 2012-02-24T10:50:19Z No. of bitstreams: 1 __pdn.sciencedirect.com_....0-S0926669010002827-main.pdf: 299695 bytes, checksum: e7f9c64493ab9cd5535802349aa9772b (MD5) Made available in DSpace on 2012-02-24T10:50:19Z (GMT). No. of bitstreams: 1 __pdn.sciencedirect.com_....0-S0926669010002827-main.pdf: 299695 bytes, checksum: e7f9c64493ab9cd5535802349aa9772b (MD5) Previous issue date: 2011-05 Cellulose acetate is one of the components employed in drug controlled-release systems in the form of membranes. The aim of this study was to examine the controlled-release of doxycycline employing cellulose acetate symmetric and asymmetric membranes as matrices. The cellulose triacetate was produced from sugarcane bagasse through a homogeneous acetylation reaction, using acetic acid as the solvent,acetic anhydride as the acetylating agent and sulfuric acid as the catalyst. The viscosity average molecular weight of the cellulose acetate produced was 39,000 g mol−1. The symmetric membranes were produced using a system solvent of dichloromethane/ethanol (9:1, v/v) and the asymmetric membranes were produced from the same solvent system and 10% of water. For the formulation of both, 5% of doxycycline was used. The membranes were characterized by thermal analysis (DSC and TGA) and scanning electron microscopy SEM. The release of doxycycline through cellulose triacetate matrices was examined using spectrophotometric analysis in the ultraviolet–visible region, at 275 nm. The results revealed that asymmetric membranes release 80% of the drug in 100 min, while symmetric membranes release 14% of the drug during the same time interval.
Databáze: OpenAIRE
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