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Formulation, Evaluation and Comparison of Mesalamine compression coated tablets by using Natural and Semi synthetic polymers

The main objective of this research paper is to formulate, evaluate and compare compression-coated tablets of Mesalamine using natural and synthetic polymer. The natural polymers used were pectin and Xanthan gum and the synthetic polymer used was HPMC E50 LV. Initially tablets were prepared by direct compression method using different polymers and both pre-compression and post-compression evaluation was conducted. Using the same polymers compression coated tablets of mesalamine were prepared by compression coating method using Cellulose acetate phthalate as the enteric polymer. These tablets were also subjected to pre-compression and post-compression evaluation and all the values obtained were in acceptable limits. Dissolution studies were conducted in different media having pH 1.2, 6.8 and 7.4. The dissolution results showed the drug release of uncoated tablet of HPMC E50 LV was 108.42% at 480 minutes, Pectin was 100.53% at 300 minutes and Xanthan gum was 108.73% at 90 minutes. The drug release of coated tablets of HPMC E50 LV was 100.42% at 680 minutes, Pectin was 102.31% at 580 minutes and Xanthan gum was 100.42% at 300 minutes. Hence the study showed that the compression coated tablets of mesalamine using HPMC E50 LV showed delayed release of the drug in 680 minutes. 
Keywords: Mesalamine, Colon targeting drug delivery system, Compression coating method, Delayed release, Cellulose acetate phthalate.