Process for producing lipoprotein-containing substance having reduced lipid content

A process for producing a liquid egg yolk having a reduced lipid content, which comprises the steps of:

• treating a liquid egg yolk with at least one enzyme selected from the group consisting of proteolytic enzymes and lipolytic enzymes so that when said at least one proteolytic enzyme is used the degree of solubilization in 0.22M trichloroacetic acid of proteins in the liquid egg yolk after the treatment with the proteolytic enzyme is from 1.5% to 30% or when said at least one lipolytic enzyme is used the decomposition ratio of lipids in the liquid egg yolk after the treatment with the lipolytic enzyme is from 5% to 50%;
• bringing the enzyme treated liquid egg yolk into contact with a sub- or supercritical fluid to extract lipid therefrom sufficient to form a reduced lipid liquid egg yolk;
• and separating the extracted lipid from the enzyme treated liquid egg yolk.