The consequence of the chemical composition of HPMC in matrix tablets on the release behaviour of model drug substances having different solubility
Journal article, 2011

This study investigates the effect of the chemical heterogeneity of hydroxypropyl methylcellulose (HPMC) on the release of model drug substances from hydrophilic matrix tablets. The hypothesis was that the release of drug substances could be influenced by possible interactions with HPMC batches having different chemical heterogeneity. The cloud point of the most heterogeneous batch was more affected by the model drug substances, methylparaben and butylparaben, and most by butylparaben with the lowest solubility. The different clouding behaviour was explained by the heterogeneously substituted batches being more associative and the more lipophilic butylparaben being able to interact more efficiently with the hydrophobic HPMC transient crosslinks that formed. Interestingly, tablet compositions of the heterogeneously substituted HPMC batches released the more soluble methylparaben at lower rates than butylparaben. The explanation is that the hydrophobic HPMC interactions with butylparaben made the gel of the tablet less hydrated and more fragile and therefore more affected by erosional stresses. In contrast, drug release from compositions consisting of the more homogeneously substituted batches was affected to a minor extent by the drugs and was very robust within the experimental variations. The present study thus reveals that there can be variability in drug release depending on the lipophilicity of the drug and the substituent heterogeneity of the HPMC used.

Solubility

polymer

Hydrophilic matrix tablets

Polymer erosion

dissolution behavior

particle-size

hydroxypropylmethylcellulose

delivery systems

disintegration

temperature

Chemical heterogeneous

Drug release

substitution pattern

cellulose

HPMC

hydroxypropyl methylcellulose

Author

Anna Viridén

SuMo Biomaterials

Chalmers, Chemical and Biological Engineering, Pharmaceutical Technology

Bengt Wittgren

AstraZeneca AB

Anette Larsson

Chalmers, Chemical and Biological Engineering, Pharmaceutical Technology

SuMo Biomaterials

European Journal of Pharmaceutics and Biopharmaceutics

0939-6411 (ISSN) 18733441 (eISSN)

Vol. 77 1 99-110

Subject Categories

Chemical Sciences

DOI

10.1016/j.ejpb.2010.11.004

More information

Latest update

8/18/2020