The invention discloses a method for preparing egg
yolk lecithin by adopting a two-step subcritical extraction technology, and belongs to the technical field of subcritical fluid extraction. According to the method, frozen egg
yolk gel is used as a
raw material, egg
yolk powder is obtained through
dilution, homogenization,
centrifugation and
spray drying, then the two-step subcritical extraction technology is adopted for preparing the egg yolk
lecithin,
solvent residues are avoided, the yield of
lecithin in the obtained product is as high as 92.7%, the purity is as high as 95.8%, and the egg yolk lecithin can be directly used for medicines, food and health care products. According to the method, the extraction
temperature and pressure are mild, protection of high-value components such as DHA,
carotenoid and
folic acid in a by-product
egg oil is facilitated, and the application potential in
medicine and food industries is huge; and meanwhile, another obtained by-product
natural antibody egg yolk immune
globulin has high
helicobacter pylori resisting activity, and can effectively treat diseases such as gastric ulcer. Therefore, egg yolk resources can be fully utilized, and the comprehensive utilization value of the egg yolk is improved.