The invention relates to a method for producing highly digestible, partly hydrolyzed keratinaceous material, preferably from feathers, hair, wool, hooves or nails, comprising the steps of (1) hydrolyzing keratinaceous material in the presence of water, in a hydrolyser with heat and at a pressure between about 2 bar and about 100 bar, and (2) concurrently drying and grinding the resultant hydrolyzed keratinaceous material in an air turbulence mill at about atmospheric pressure such that the drop in pepsin N and/or ileal digestibility is less than 10%, and/or the pepsin and ileal digestibility remain higher than respectively 75% and 80%, wherein the resultant keratinaceous material comprises at least partly insoluble material, and wherein the average particle size of the dry product leaving the air turbulence mill measured as d50 in volume fraction, as measured with laser diffraction using a dry powder Beckman Coulter particle size analyzer, is between about 20 ?m and about 0.7 mm and the d90 is below about 1 mm.

A process for preparing fish bone powder according to this invention generally comprising at least 4 steps: pre-heating, removing of impurity, drying and milling to derive a calcium-rich bone powder product that contains calcium in the range of 18-22 g/100 g of the final product. In addition, the bone powder particle size obtained is less than 100 microns and contains high levels of protein, fat, and essential minerals, such as sodium and phosphorus. The source of bone can be obtained from any fishes, preferably from tuna.

The invention relates to a method for producing digestible keratinaceous material comprising the steps of hydrolysing keratinaceous material in the presence of water in a hydrolyser at elevated temperature and at a pressure between about 2 bar and about 15 bar, and drying the resultant hydrolysed keratinaceous material comprising at least partly insoluble material in a dryer at a temperature/time/pressure combination which limits the drop in pepsin and/or ileal digestibility by less than 10%, and/or such that the pepsin and/or ileal digestibility remains higher than 85%, or such that the pepsin and ileal digestibility remains higher than respectively 75% and 85%. Preferably, the drying of the resultant hydrolysed partly soluble keratinaceous material is performed in a dryer at a temperature such that the keratinaceous material remains at a temperature below 90? C., preferably below 80? C.

The invention relates to a method for producing digestible keratinaceous material comprising the steps of hydrolysing keratinaceous material in the presence of water in a hydrolyser at elevated temperature and at a pressure between about 2 bar and about 15 bar, and drying the resultant hydrolysed keratinaceous material comprising at least partly insoluble material in a dryer at a temperature/time/pressure combination which limits the drop in pepsin and/or ileal digestibility by less than 10%, and/or such that the pepsin and/or ileal digestibility remains higher than 85%, or such that the pepsin and ileal digestibility remains higher than respectively 75% and 85%. Preferably, the drying of the resultant hydrolysed partly soluble keratinaceous material is performed in a dryer at a temperature such that the keratinaceous material remains at a temperature below 90? C., preferably below 80? C.

A tribo-electro static separation process and system for the preparation of various food and feed products. A tribo-electric separation process and system for fractionating a feed mixture comprising at least two members of the group of proteins, starches, soluble and insoluble fibers. Namely, supplying a feed mixture comprising at least two of the group of proteins, starches, soluble and insoluble fibers to a tribo-electric separator and simultaneously charging and separating the feed mixture into at least two subfractions, with one of the subfractions enriched in one of protein, starch and fiber and having a composition different than the feed mixture.

A tribo-electro static separation process and system for the preparation of various food and feed products. A tribo-electric separation process and system for fractionating a feed mixture comprising at least two members of the group of proteins, starches, soluble and insoluble fibers. Namely, supplying a feed mixture comprising at least two of the group of proteins, starches, soluble and insoluble fibers to a tribo-electric separator and simultaneously charging and separating the feed mixture into at least two subfractions, with one of the subfractions enriched in one of protein, starch and fiber and having a composition different than the feed mixture.

A process for the production of a soluble collagen product and an insoluble collagen product from mammalian dermis tissue is described. The tissue may initially be processed to remove the epidermis and adipose tissue and then minced into small pieces. The process includes washing the minced dermis in an enzymatic solution, such as an amylase solution followed by homogenizing the amylased tissue. The soluble and insoluble collagen is then extracted from the homogenized tissue and subsequently separated into distinct soluble and insoluble fractions. The process produces collagen with high Dalton values that can subsequently be combined to produce a mixed composite collagen product. Also, the extracted collagen may be used as an integral composite collagen before separation.

A tribo-electrostatic separation process and system for the preparation of various food and feed products. A tribo-electric separation process and system for fractionating a feed mixture comprising at least two members of the group of proteins, starches, soluble and insoluble fibers. Namely, supplying a feed mixture comprising at least two of the group of proteins, starches, soluble and insoluble fibers to a tribo-electric separator and simultaneously charging and separating the feed mixture into at least two subfractions, with one of the subfractions enriched in one of protein, starch and fiber and having a composition different than the feed mixture.

A tribo-electrostatic separation process and system for the preparation of various food and feed products. A tribo-electric separation process and system for fractionating a feed mixture comprising at least two members of the group of proteins, starches, soluble and insoluble fibers. Namely, supplying a feed mixture comprising at least two of the group of proteins, starches, soluble and insoluble fibers to a tribo-electric separator and simultaneously charging and separating the feed mixture into at least two subfractions, with one of the subfractions enriched in one of protein, starch and fiber and having a composition different than the feed mixture.

A protein fraction and an oxidation stable fat fraction are recovered from poultry containing fat, bone and protein. The poultry is comminuted, mixed with a food grade acid at pH 3.6 to 4.4 to form a liquid protein fraction and a solid fat fraction. The liquid fraction is mixed with a food grade alkali to precipitate the protein.