|Studies and evaluation of compressed microspheres
Idris M El-Mahdi, Atef M Madi
January-June 2016, 1(1):6-16
This work was aimed at the use of dissolution testing and similarity factor to assess the level of damage taken by active drug microspheres during compression in tablet dosage form. To achieve that, combinations of suitable excipients were used to protect drug microspheres during compression. The excipients were used in the form of powders, granules or placebo pellets prepared by extrusion-spheronization technology. The excipients were evaluated alone, in combinations and post-compression into compacts. Preliminary experiments included assessing density, hardness, friability and disintegration of all the selected excipients. Based on such experiments it was found that the flowability of combination of powders was more acceptable than individual excipients. Two combinations of microcrystalline -starch and microcrystalline cellulose -calcium carbonate granules were selected to be compressed with pellets of the active pharmaceutical ingredient ketoprofen. In all the combinations used there was a significant amount of damage to drug pellets. The kinetics of drug release appears to follow the zero-order rate, which remained unchanged even when a significant degree of damage to pellets occurs. It was found that a high level of excipients is required in order to prepare microspheres as a rapid disintegrating tablet.
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|Evaluation of pearl millet starch as tablet disintegrant
BY Mhana, JS Mezogi, MA El-Majri, AM Abushoffa
July-December 2017, 2(2):152-163
Objectives: This study aims to evaluate a novel tablet excipient obtained from local sources, Pearl millet Pannistumamericanum starch of family Poaceae which is used locally as food because of its high carbohydrate content. It was thought that the starch of Pearl millet Pannistumamericanum may serve as a tablet disintegrant.
Methods: The excipient properties of Pearl millet starch as well as the pregelatinized form were studied in paracetamol tablets produced by wet and dry granulation methods of massing and screening and compared with maize starch BP.
Results: Wet method showed superiority in all properties of both granules and tablets. Using wet method granulations Pearl millet Pannistumamericanum starch and maize starch BP have similar angle of repose, Carr's index, tapped density, bulk density, and Hausner's ratio, however, Pearl millet Pannistumamericanum starch has shown advantageous in some properties such as moisture content and swelling index. Tablet produced with Pearl millet Pannistumamericanum starch disintegrated almost the same of those produced with maize starch BP at all concentrations employed. It was also found that when used as a disintegrant, the pre-gelatinized form provide tablets with better hardness and friability values than maize starch BP.
Conclusion: This study confirmed the suitability of Pearl millet Pannistumamericanum starch as an alternative to maize starch BP as a tablet disintegrant, particularly, in paracetamol tablet formulation.
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