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Abstract

A process for preparing a functional material by heat-treating a skin portion of poultry to carry out deoiling and defatting and to concentrate and pasteurize human-type sphingomyelin and plasmalogen-type glycerophospholipid contained in said skin portion, said heat-treatment comprising the steps of (A) continuously injecting hot water heated to 100° C. or higher and/or steam into a heating chamber of a semi-sealed space having said temperature or higher, to generate water microdroplets and moist hot steam, (B) replacing air in said heating chamber with said water microdroplets and moist hot steam, to fill a gas component (gaseous water) that has a composition having a relative humidity of 95% or more and an oxygen concentration of 0.2% by volume or less and that is maintained in a temperature range of 100 to 115° C., (C) injecting steam in a 100% wet state to said gaseous water to stably form a composite heating medium composed of hot water, water microdroplets and steam, and (D) applying continuous amplitude heating including a temperature difference of at least 10° C. to the skin portion of poultry with said composite heating medium in an atmosphere having a temperature of 100 to 115° C. and an oxygen concentration of 0.2% by volume or less.

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First Claim