An agent for protecting upper respiratory tracts or a food or drink composition for protecting upper respiratory tracts which is effective in ameliorating various symptoms relating to upper respiratory tracts is provided.

An agent for protecting upper respiratory tracts and a food or drink composition for protecting upper respiratory tracts containing lactoferrin, lactoperoxidase, glucose oxidase, glucose source, and a pH adjusting component as active ingredients is provided.

The agent for protecting an upper respiratory tract according to the present invention and the food or drink composition for protecting an upper respiratory tract can ameliorate various symptoms relating to upper respiratory tracts.

An agent for protecting upper respiratory tracts or a food or drink composition for protecting upper respiratory tracts which is effective in ameliorating various symptoms relating to upper respiratory tracts is provided.

An agent for protecting upper respiratory tracts and a food or drink composition for protecting upper respiratory tracts containing lactoferrin, lactoperoxidase, glucose oxidase, glucose source, and a pH adjusting component as active ingredients is provided.

The agent for protecting an upper respiratory tract according to the present invention and the food or drink composition for protecting an upper respiratory tract can ameliorate various symptoms relating to upper respiratory tracts.

The present invention provides a protein composition comprising a milk basic protein fraction; and at least one stabilizer selected from the group consisting of soybean polysaccharides, xanthan gum, pectin, gum arabic, gum ghatti, carrageenan, locust bean gum, sodium caseinate, lecithin, and carboxymethylcellulose. The protein composition significantly improves the heat resistance of the milk basic protein fraction. The present invention achieves heat treatment of a protein composition and food, beverage, feed, and pharmaceutical comprising such a protein composition at a temperature exceeding 90 C. without deactivation of the milk basic protein fraction.

The present invention provides a protein composition comprising a milk basic protein fraction; and at least one stabilizer selected from the group consisting of soybean polysaccharides, xanthan gum, pectin, gum arabic, gum ghatti, carrageenan, locust bean gum, sodium caseinate, lecithin, and carboxymethylcellulose. The protein composition significantly improves the heat resistance of the milk basic protein fraction. The present invention achieves heat treatment of a protein composition and food, beverage, feed, and pharmaceutical comprising such a protein composition at a temperature exceeding 90 C. without deactivation of the milk basic protein fraction.