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Ibuprofen is a non-steroidal anti-inflammatory drug which also has analgesic and antipyretic activities (Mycek et al., 2000). The drug is practically very slightly soluble, but it is readily absorbed from the gastrointestinal tract. This drug causes irritation of gastric mucous membrane. It is also unstable to light. Hence, microencapsulation of the drug in a polymeric shell would be of advantage to these drawbacks.The use of new natural hydrophilic polymers as drug carriers has received considerable attention in recent decades (Remunan-Lopez and Bodmeier, 1996). Grewia gum is a polysaccharide gum derived from the inner stem bark of edible plant Grewia mollis Juss. (Family Tiliaceae). The plant is a shrub abundant in the savannah region of West Africa. The leaves and bark of the plant contain gum. In Nigeria, the dried and pulverized inner stem bark of the plants is used as a thickening agent in some local dishes (Okafor and Chukwu, 2003).Grewia gum is one of the gums that have potential application in pharmaceutical formulations. The gum is reported to be compatible with many drugs and excipients (Okafor et al., 2001). The isolation, chemical contents, physicochemical and rheological properties of the gum has been reported elsewhere (Okafor et al., 2001). Also the binding property, mechanical properties, water vapor permeability of the gum film as well as the influence of granulating solvents on drug release from tablets containing grewia gum have been reported (Okafor et al., 2003; Okafor et al., 2004). But, no report had been given on the application of the gum in microencapsulation.Several kinds of preparations such as tablets, capsules and coated pellets have been suggested for use as oral extended release formulations. In order to formulate drug powder into these dosage forms, it is very important to assess its flow properties. The physical, chemical and pharmacologic properties of a drug are affected by the size, surface area and surface to volume ratio of a drug particle. Particle size of material used in formulation of suspension, emulsions and tablets is of great importance. Also, the dissolution rate of drug powders and its stability is greatly affected by the particle size distribution (Ozyazici, 1996).The aim of this work is to investigate the effect of microencapsulation process on the compressibility and compactibility of ibuprofen powder using gelatin-grewia gum in comparison to that of gelatin-acacia gum. Hence, the flow rate, angle of repose, bulk density, tapped density, true density and mean particle size of the microcapsules were determined. The sustained release dosage forms can be obtained by eitherThe Pacific Journal of Science and Technology –470– http://www.akamaiuniversity.us/PJST.htm Volume 13. Number 1. May 2012 (Spring)tableting the microcapsules or filling these microcapsules into hard gelatin capsules. Therefore, the Carr’s (consolidation) index and Hausner ratio of microcapsules were calculated in order to determine the flow ability of the microcapsules.
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