Evaluation of pectin-hpmc as compression coating: I - A study of the swelling properties of coated tablet

Abstract

In this study, core tablets of dry theophylline were compressed coated using the system pectin-HPMC for controlled drug delivery. The methodology applied produced coated tablets with suitable physical characteristics according to Brazil Pharmacopeia 4th edition. The physical properties were evaluated for different ratios (80:20, 60:40, 50:50, 40:60, 20:80, 0:100) of pectin-HPMC, respectively, and the swelling test was carried out in simulated gastric fluid (pH 1.2) and in simulated intestinal fluid (pH 6.8). The method applied gave origin to coated tablets with high expectation in the kinetics control of drug release. From the statistics analyses of the results obtained, it was observed that results were not significant between different ratios.