OPTIMIZATION OF FORMULATION OF SOLID DISPERSION OF FUROSEMIDE BY FACTORIAL DESIGN
Objective: The present study aimed to improve the rate of dissolution of furosemide by solid dispersion technique.
Methods: Solid dispersion of furosemide was prepared by using hydrogel isolated from the seeds of Lepidium sativum as a novel carrier by the solvent evaporation method. Solid dispersion was evaluated to study the improvement in the rate of dissolution. Molecular dispersion of furosemide in the novel carrier was studied by DSC and FTIR studies. Solid dispersion was filled in capsules after stability studies and the formulation was optimized by adopting factorial design.
Results: Solid dispersion of furosemide exhibited dissolution improvement from 13.54 % (plain furosemide) to 69.12% (solid dispersion) in the first 60 min. Improvement in dissolution efficiency was found to be retained after stability studies. Capsules were filled with the formulation of solid dispersion using two different grades of lactose-α lactose monohydrate and anhydrous lactose and were found stable after stabilization studies.
Conclusion: The dissolution improvement of furosemide was attributed to its molecular dispersion in the novel carrier selected for this study. The recrystallization of furosemide was prevented due to intermolecular interaction between the novel carrier and furosemide. This was confirmed by FTIR. Evaluation of the dissolution data of factorial batches was analyzed by ANOVA. Analysis of the data revealed that selected levels of α lactose monohydrate and anhydrous lactose would be useful to navigate design space.
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