modification of flow and compressibility of corn starch using quasi-emulsion solvent diffusion method

objective(s):the aim of this study was to improve flowability and compressibility characteristics of starch to use as a suitable excipient in direct compression tabletting. quasi-emulsion solvent diffusion was used as a crystal modification method. materials and methods: corn starch was dissolved in hydrochloric acid at 80˚c and then ethanol as a non-solvent was added with lowering temperature until the formation of a precipitate of modified starch. flow parameters, particle size and thermal behavior of the treated powders were compared with the native starch. finally, the 1:1 mixture of naproxen and each excipient was tabletted, and hardness and friability of different tablets were evaluated. results: larger and well shaped agglomerates were formed which showed different thermal behavior. treated starch exhibited suitable flow properties and tablets made by the treated powder had relatively high hardness. conclusion:  it was found that recrystallization of corn starch by quasi emulsion solvent diffusion method could improve its flowability and compressibility characteristics.