Purpose: To study the effect of different polymers on the solubility and dissolution rate of cefuroxime axetil (CFU) prepared by emulsion solvent diffusion (ESD
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In this article we describe the optimizing parameters in the process of spherical crystallisation. Particle engineering of active pharmaceutical agents is an innovative area of research in pharmaceutical industry because of several advantages. Spherical crystallization is one of the particle engineering technique in which drug directly gets crystallized and agglomerated into spherical shape. The spherical crystals can be obtained by different methods like solvent change, Quasi-emulsion droplet, ammonia diffusion and neutralisation. The optimization of process of spherical crystallization is important for obtaining the ideal spherical crystal agglomerates. It includes stirring rate, selection of solvent, pH, temperature etc. which affects on the physico-chemical properties of crystals. These optimizing parameters play its specific role in formation of spherical crystals. Stirring rate affects the shape as well as size of the final agglomerates and solvent selection helps in the formation of maximum amount of agglomerates in the system. The factors like pH and temperature should be maintained in case of drugs which show polymorphism. Apart from this, several others physical phenomenon or parameters like interfacial tension and rate of crystallisation are also important for thorough optimization of process.
Numerous natural polymers either alone or in combination with other polymers were found effective in controlling the drug release. In this study the attempts were made to combine chitosan (degree of deacetylation 84.14 %) and as hydroxylpropyl methylcellulose (HPMC K 15M) to retard the release of aceclofenac in tablet formulation. The tablets were prepared by wet granulation and evaluated for pre and post- compression parameters. All the pre-compression parameters were found within the limit. Hardness and friability values were found in the range of 4.30-4.89 kg/cm2 and 0.1-0.6% respectively. These results proved the good mechanical strength of the formulations. The drug content was found in the range of 97.56 – 99.10 %. Weight variation was found within the official limit. The percent drug release and swelling index was found to be dependent on the concentration of polymer. With increasing the concentration of both the polymers the swelling index was increased and drug release decrease. Highest concentration of both the polymers was found to retard the drug release up to 8 h. The effect of Chitosan and HPMC on drug release was evaluated by design expert software to achieve the optimized formulation. The response of the drug release after 4h was considered to check the drug release. It was found that the enhanced concentration of both the polymers had negative effective on the drug release. The formulation containing highest concentration of the chitosan and HPMC was found be fit in the limits of optimized formulations. The optimized formulation was found to be stable at accelerated stability storage conditions.
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