Abstract
AbstractThe effect of spheronization method on drug release from coated spheres may be evaluated by determining the drug release rate, the critical coating level and the release mechanism. Drug release is faster from pan beads than from marumerizer beads at the same coating level. An equation is proposed which indicates that the critical coating level is inversely proportional to sphere size and sphere density, which in turn results from the different spheronization techniques. From the calculation, the critical coating levels for 14/16 mesh cuts of marumerizer beads and pan beads are 12% and 18%, respectively. Disintegration, pore-control and barrier control are involved in the release mechanisms of drugs from coated pan beads.
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