Method for producing peptones comprising proteins and amino acids from mucous membranes of animals to be slaughtered, and the peptones themselves

A peptone, wherein said peptone has been produced by a method comprising the following steps:

• (1) providing a composition containing proteins and amino acids from mucous membranes of animals for slaughter, inorganic salts and water, wherein the sum of the mass of proteins and amino acids in the dry mass of said composition is 30 to 70 weight percent and the mass of inorganic salts in the dry mass of said composition is at least 7.5 weight percent;
• (2) filtering the composition to obtain a filtrate and a filter cake;
• (3) cooling the filtrate to a temperature in the range of −15° ° C. to 15° C. to form a precipitate;
• (4) separating the resulting precipitate to obtain the liquid phase as the product.

A filter cake, wherein said filter cake has been produced by a method comprising the following steps:

• (1) providing a composition containing proteins and amino acids from mucous membranes of animals for slaughter, inorganic salts and water, wherein the sum of the mass of proteins and amino acids in the dry mass of said composition is 30 to 70 weight percent and the mass of inorganic salts in the dry mass of said composition is at least 7.5 weight percent;
• (2) filtering the composition to obtain a filtrate and a filter cake;
• (3) cooling the filtrate to a temperature in the range of −15° C. to 15° C. to form a precipitate;
• (4) separating the resulting precipitate to obtain the liquid phase as the product.