Drug dissolution from indomethacin-starch hybrid powders prepared by the dry impact blending method.

Indomethacin was hybridized with potato starch using a dry impact blending method. Resultant hybrid powders were investigated by scanning electron microscopy and X-ray powder diffraction. Amorphous indomethacin spread over the starch surface in a layer immediately after being hybridized, and then gradually reverted to fine crystalline particles adhering firmly to the starch surface. Indomethacin dissolution from the hybrid powder was compared with those from physical mixtures and granules taken from a commercially available capsule. Indomethacin dissolution from powder and capsule dosage forms, even in an acidic medium, was drastically accelerated by the hybridization.