Soybean vegetable oil. According to Baidu Encyclopedia, soybean phospholipid is a product extracted from oil residue produced by soybean oil, which is an ester composed of glycerol, fatty acid, choline or cholamine, so phospholipid can be dissolved in soybean oil. Phospholipids are amphoteric molecules, ordinary phospholipids are lipophilic phospholipids, and the HLB value is between 3 and 5. The most common phospholipid is lecithin, and the content of phospholipids in crude oil is the highest in soybean crude oil, which is the most important source of plant phospholipids.