Physicochemical characterization and drug release properties of Eudragit(R) E PO/Eudragit(R) L 100-55 interpolyelectrolyte complexes Export

@article{citeulike:2620711, abstract = {The formation of interpolyelectrolyte complexes (IPEC) between Eudragit(R) E PO (EE) and Eudragit(R) L 100-55 (EL) was investigated, using turbidimetry, apparent viscosity measurements, elementary analysis and MT-DSC. The structure of the synthesized IPEC was investigated using FT-IR spectroscopy. The binding ratio of a unit molecule of EL with EE was found to be approximately 1:1 at pH 5.5. Based on the results of elementary analysis and FT-IR, the binding ratio of each component in the solid complexes was very close to that observed in turbidity and apparent viscosity measurements and indicate that the synthesized products can be considered as IPEC. As a result of electrostatic interaction between the polymer chains, the glass transition temperature of the IPEC increased significantly. Due to the structure of the IPEC, two maxima were observed in the swelling behavior as a function of pH. The release of the model drug ibuprofen (IBF) was significantly retarded from tablets made up of the IPEC as compared with individual copolymers, its physical mixture and Eudragit(R) RL PO (RL), RS PO (RS).}, author = {Moustafine, Rouslan I. and Zaharov, Igor M. and Kemenova, Vera A.}, citeulike-article-id = {2620711}, citeulike-linkout-0 = {http://dx.doi.org/10.1016/j.ejpb.2005.10.005}, citeulike-linkout-1 = {http://www.sciencedirect.com/science/article/B6T6C-4HWXKY2-1/2/28ea622b48f3e1d64a417ac25ff0cd38}, doi = {10.1016/j.ejpb.2005.10.005}, journal = {European Journal of Pharmaceutics and Biopharmaceutics}, keywords = {combinations, russian}, month = {May}, number = {1}, pages = {26--36}, posted-at = {2008-04-01 19:07:59}, priority = {2}, title = {Physicochemical characterization and drug release properties of Eudragit(R) E PO/Eudragit(R) L 100-55 interpolyelectrolyte complexes}, url = {http://dx.doi.org/10.1016/j.ejpb.2005.10.005}, volume = {63}, year = {2006} }

TY - JOUR ID - citeulike:2620711 L3 - citeulike-article-id:2620711 N2 - The formation of interpolyelectrolyte complexes (IPEC) between Eudragit(R) E PO (EE) and Eudragit(R) L 100-55 (EL) was investigated, using turbidimetry, apparent viscosity measurements, elementary analysis and MT-DSC. The structure of the synthesized IPEC was investigated using FT-IR spectroscopy. The binding ratio of a unit molecule of EL with EE was found to be approximately 1:1 at pH 5.5. Based on the results of elementary analysis and FT-IR, the binding ratio of each component in the solid complexes was very close to that observed in turbidity and apparent viscosity measurements and indicate that the synthesized products can be considered as IPEC. As a result of electrostatic interaction between the polymer chains, the glass transition temperature of the IPEC increased significantly. Due to the structure of the IPEC, two maxima were observed in the swelling behavior as a function of pH. The release of the model drug ibuprofen (IBF) was significantly retarded from tablets made up of the IPEC as compared with individual copolymers, its physical mixture and Eudragit(R) RL PO (RL), RS PO (RS). IS - 1 JF - European Journal of Pharmaceutics and Biopharmaceutics EP - 36 TI - Physicochemical characterization and drug release properties of Eudragit(R) E PO/Eudragit(R) L 100-55 interpolyelectrolyte complexes VL - 63 SP - 26 KW - combinations KW - russian AU - Moustafine, Rouslan AU - Zaharov, Igor AU - Kemenova, Vera PY - 2006/05// UR - http://dx.doi.org/10.1016/j.ejpb.2005.10.005 ER -