Pernasally absorbable insulin preparations
An insulin formulation with porous, spherical calcium carbonate composed of trabeculate or needle-shaped crystals, or an aggregation of the parallel intergrowth of these forms, as its carrier, will be presented. This formulation is beneficial for the treatment of diabetes.
1. A formulation for the nasal absorption of insulin, which comprises a component composed of insulin and porous, spherical calcium carbonate as its carrier, said calcium carbonate having a relative surface area of 1.5 m 2 /g or greater (BET method) and the porous, spherical calcium carbonate has a particle diameter substantially in the range of 20-32 μm, wherein the insulin is adsorbed or carried on said carrier as a monolayer or multilayer.
2. The formulation according to claim 1 , in which the porous, spherical calcium carbonate, comprises trabeculate or needle-shaped crystals, or an aggregation of the parallel intergrowth of these forms.
3. The formulation according to claim 1 , in which the porous, spherical calcium carbonate has a particle diameter substantially in the range of 20-32 μm, and a median particle diameter of 22 μm or greater and less than 30 μm.
4. The formulation according to claim 1 , in which the insulin content of the component composed of insulin and porous, spherical calcium carbonate is 0.1-50% by weight based on the total weight of the component.
5. The formulation for the nasal absorption of insulin comprising a component composed of insulin and calcium carbonate as its carrier, in which the calcium carbonate is substantially composed of cubic or trigonal system crystals and has a particle diameter in the range of 20-32 μm.
6. The formulation according to claim 1 , in which the insulin content of the component composed of insulin and calcium carbonate is 0.1-50% by weight based on the total weight of the component.
7. A method for the treatment of diabetes that comprises administering the formulation of claim 1 into the nasal cavities of diabetics who need an effective amount of insulin.
8. The method according to claim 7 , in which the calcium carbonate is substantially composed of cubic or trigonal system crystals with a particle diameter in the range of 20-32 μm, and the insulin content of a combined component of insulin and calcium carbonate is 0.1-50% by weight based on the total weight of the component.