Method for producing hydrolysed keratinaceous material

A method for the production of a digestible hydrolysed material comprising the steps of subjecting a partly hydrolysed, partly insoluble keratinaceous material to a further chemical hydrolysis step,

• wherein the partly hydrolysed, partly insoluble keratinaceous material comprises—when dissolved in water/acetonitrile/TFA—about 40 wt % or more of material that has a molecular weight of about 5000 dalton or less, and about 20 wt % or more of material having a molecular weight of about 5000 dalton or higher, obtained from thermal and pressure hydrolysis,
• wherein the hydrolysis reaction is performed with only water/steam as the active reagent at a pressure of 4 bar absolute or higher, and
• wherein the further chemical hydrolysis step comprises chemical hydrolysis with an strong mineral acid to obtain the digestible hydrolysed material, and purifying the digestible hydrolysed material wherein the digestible material has 90% by weight or more of material of a molecular weight of 1000 dalton or lower and an in vitro ileal digestibility of 98% or more, and an in vitro pepsin digestibility of 98% or more.

A method for the production of a digestible hydrolysed keratinaceous material comprising subjecting a partly hydrolysed keratinaceous material with a moisture content of about 10 wt % or less to a chemical hydrolysis step,

• wherein the partly hydrolysed keratinaceous material is a keratinaceous meal,
• wherein the partly hydrolysed keratinaceous material comprises—when dissolved in water/acetonitrile/TFA—about 40 wt % or more of material that has a molecular weight of about 5000 dalton or less, and about 20 wt % or more of material having a molecular weight of about 5000 dalton or higher,
• wherein the chemical hydrolysis step comprises chemical hydrolysis with a strong mineral acid to achieve the digestible hydrolysed keratinaceous material, and purifying the digestible hydrolysed keratinaceous material wherein the digestible material has 90% by weight or more of material of a molecular weight of 1000 dalton or lower and an in vitro ileal digestibility of 98% or more, and an in vitro pepsin digestibility of 98% or more.