Abstract: A milk protein fraction having following properties (1) to (4) is excellent in bone resorption inhibitory effect, and is useful for preventing or treating bone diseases: (1) the milk protein fraction is derived from milk; (2) the milk protein fraction is a fraction containing a protein having a molecular weight of 12,000 to 16,000 Daltons; (3) the milk protein fraction has a basic amino acid content of 18 to 20 wt % in the constitutional amino acid composition, and the ratio of the amount of a basic amino acid(s) to the amount of an acidic amino acid(s) is 0.7 to 0.9; and (4) the milk protein fraction has a bone resorption inhibitory effect.

Abstract: Disclosed is a bone-reinforcing agent which comprises a milk protein fraction having the following properties (1) to (4): (1) the milk protein fraction is derived from milk; (2) the milk protein fraction is a fraction containing a protein component having a molecular weight of 6,000 to 150,000 Daltons; (3) the milk protein fraction has a basic amino acid content of 12 to 14 wt % in the constitutional amino acid composition, and the ratio of the amount of a basic amino acid(s) to the amount of an acidic amino acid(s) is 0.5 to 0.7; and (4) the milk protein fraction has an activity of accelerating the calcification in an osteoblast.

Abstract: Our objective is to provide a novel lipid metabolism-improving reagent effective in preventing and treating hyperlipidemia and obesity and to provide this reagent in food, beverages, nutritional supplements, and fodders with the ability to improve lipid metabolism. The whey protein hydrolysate as the active ingredient in the lipid metabolism-improving reagent has a molecular weight distribution of 10 kDa or less, with the main peak between 200 Da to 3 kDa, average peptide chain length (APL) of 2-8, free amino acid content of 20% or less, antigenicity of 1/10,000 or less compared with that of ?-lactoglobulin.

Abstract: Disclosed is a substance capable of promoting the repair of a fractured part in a fracture caused by an external force, fatigue or a disease. Also disclosed is a method for producing the substance. Further disclosed is a product capable of promoting the repair of a fracture, such as a food, a beverage and a feed, which comprises the fracture repair promoter. Specifically disclosed is a fracture repair promoter comprising, as an active ingredient, a fraction containing a milk-derived basic protein. In the promoter, the fraction containing the milk-derived basic protein is produced by contacting milk or a milk-derived raw material with a cation exchange resin to cause the adsorption of the basic protein on the cation exchange resin and eluting a fraction adsorbed on the resin by means of an eluent having a salt concentration of 0.1 to 1.0 M.

Abstract: Disclosed is a bone-reinforcing agent which comprises a milk protein fraction having the following properties (1) to (4): (1) the milk protein fraction is derived from milk; (2) the milk protein fraction is a fraction containing a protein component having a molecular weight of 6,000 to 150,000 Daltons; (3) the milk protein fraction has a basic amino acid content of 12 to 14 wt % in the constitutional amino acid composition, and the ratio of the amount of a basic amino acid(s) to the amount of an acidic amino acid(s) is 0.5 to 0.7; and (4) the milk protein fraction has an activity of accelerating the calcification in an osteoblast.

Abstract: Disclosed is an osteoblast differentiation promoting and osteoclast differentiation inhibiting agent which comprises a milk protein fraction having the following characteristics (1) to (4): (1) the milk protein fraction is derived from milk; (2) the milk protein fraction is a fraction containing a protein component having a molecular weight of 75,000 to 85,000 Daltons; (3) the milk protein fraction has a basic amino acid content of 13 to 15 wt % in the constitutional amino acid composition, and has a basic amino acid/acidic amino acid of 0.5 to 0.7; and (4) the milk protein fraction has an osteoblast differentiation promoting effect and an osteoclast differentiation inhibiting.

Abstract: A milk protein fraction having following properties (1) to (4) is excellent in bone resorption inhibitory effect, and is useful for preventing or treating bone diseases: (1) the milk protein fraction is derived from milk; (2) the milk protein fraction is a fraction containing a protein having a molecular weight of 12,000 to 16,000 Daltons; (3) the milk protein fraction has a basic amino acid content of 18 to 20 wt % in the constitutional amino acid composition, and the ratio of the amount of a basic amino acid(s) to the amount of an acidic amino acid(s) is 0.7 to 0.9; and (4) the milk protein fraction has a bone resorption inhibitory effect.

Abstract: Disclosed is an osteoclastogenesis inhibitory agent which comprises a milk protein fraction having the following properties (1) to (4) and the agent is excellent in an osteoclastogenesis inhibitory effect and useful for preventing or treating bone diseases: (1) the milk protein fraction is derived from milk; (2) the milk protein fraction is a fraction containing a protein having a molecular weight of 80,000 to 85,000 Daltons; (3) the milk protein fraction has a basic amino acid content of 16 to 18 wt % in the constitutional amino acid composition, and the ratio of the amount of a basic amino acid(s) to the amount of an acidic amino acid(s) is 0.65 to 0.85; and (4) the milk protein fraction has an osteoclastogenesis inhibitory effect .