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Release of theophylline and carbamazepine from matrix tablets - Consequences of HPMC chemical heterogeneity

Anna Viridén (Institutionen för kemi- och bioteknik, Farmaceutisk teknologi ; SuMo Biomaterials) ; S. Abrahmsen-Alami ; B. Wittgren ; Anette Larsson (Institutionen för kemi- och bioteknik, Farmaceutisk teknologi ; SuMo Biomaterials)
European Journal of Pharmaceutics and Biopharmaceutics (0935-1221). Vol. 78 (2011), 3, p. 470-479.
[Artikel, refereegranskad vetenskaplig]

The release of theophylline and carbamazepine from matrix tablets composed of microcrystalline cellulose, lactose and hydroxypropyl methylcellulose (HPMC) was studied. The aim was to investigate the effect of different substituent heterogeneities of HPMC on the drug release from matrix tablets composed of either 35% or 45% HPMC. The release of the poorly soluble carbamazepine was considerably affected by the HPMC heterogeneity, and the time difference at 80% drug release was more than 12 h between the formulations of different HPMC batches. This was explained by slower polymer erosion of the heterogeneous HPMC and the fact that carbamazepine was mainly released by erosion. In addition, results from magnetic resonance imaging showed that the rate of water transport into the tablets was similar. This explained the comparable results of the release of the sparingly soluble theophylline from the two formulations even though the polymer erosion and the swelling of the tablets were considerably different. Thus, it can be concluded that the drug release was highly affected by the substituent heterogeneity, especially in the case of carbamazepine, which was released mainly by erosion. (C) 2011 Elsevier B.V. All rights reserved.

Nyckelord: Hydrophilic matrix tablets, Drug release, Drug solubility, Batch-to-batch variability, HPMC chemical heterogeneity, MRI, hydroxypropyl methylcellulose matrices, polymer particle-size, drug-release, delivery-systems, physicochemical properties, hydrophilic, matrices, hydroxypropylmethylcellulose, dissolution, diffusion, kinetics



Denna post skapades 2011-09-29. Senast ändrad 2016-03-22.
CPL Pubid: 146724

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Farmaceutisk teknologi (2005-2014)
SuMo Biomaterials

Ämnesområden

Kemi

Chalmers infrastruktur