Investigation of Ethylcellulose as a Matrix Former and a New Method to Regard and Evaluate the Compaction Data

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Abstract
Three types of ethylcellulose—having different molecular weights, i.e., different viscosity grades (7, 22, 50 cP)-were used for our polymer compression tests for the production of matrix tablets. The production methods used were direct compression and wet granulation. We tested the compactability, the compressibility, and the energy involved in compaction by the use of F-D curves and the controlled drug release from the ethylcellulose matrix tablets using the above-mentioned methods. A lower viscosity grade in ethylcellulose is more compressible than the higher grade. Wet-granulated ethylcellulose also shows a better compactibility than directly compressed ethylcellulose. Our investigation indicates also that the dissolution rates are indirectly proportional to the hardness of the tablets. Furthermore, wet-granulated tablets produce a more rapid drug release than those which are directly compressed.