POWDERY EGG YOLK OIL AND POWDERY EGG YOLK LECITHIN AND THEIR PREPARATION

摘要

PURPOSE:To prepare powdery egg yolk oil and powdery egg yolk lecithin having improved stability and handleability, by selectively hydrogenating the phospholipid fraction of egg yolk oil and egg yolk lecithin. CONSTITUTION:Powdery egg yolk oil and powdery egg yolk lecithin having an iodine value of =30 can be prepared by (1) dissolving 10-60wt% of egg yolk oil having a phospholipid content of 50% and egg yolk lecithin having a phospholipid content of =50% and free from oxidation and browning in a =3C alcohol solvent (e.g. isopropyl alcohol), (2) hydrogenating the solute under a hydrogen pressure of =2kg/cm2G at 50-95 deg.C in the presence of anhydrous platinum group-metal catalyst to reduce the iodine value of the phospholipid fraction to =10, (3) filtering the reaction product to remove the catalyst, (4) concentrating under reduced pressure to remove the solvent, and (5) crushing and drying the residue.