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(i) Differences between raw materials and processes
< p style-"text-align:left;"> As the name suggests, soybean phospholipids are extracted from soybeans and are plant sources; egg yolk phospholipids are extracted from egg yolks, animal sources.egg yolk phospholipid production raw material for egg yolk powder, extraction method is organic solvent purification method and supercritical CO2 extraction method. The raw material cost is high, the production process is complex, and the production cost is also high.
table 1. table 1. Egg yolk lecithin and soybean lecithin fatty acid composition
< "0" >egg yolk phospholipid fatty acids are mostly palmic acid, oleic acid, followed by stearic acid, niacin, and also contain trace amounts of peanut tyrenoleic acid and twenty-two carbon hexaene acid in recent years, such as highly concerned polyunsaturated fatty acids and odd carbon fatty acids (such as xyluane acid), soybean phospholipids in Central Asia about 50%, almost no C20 fatty acids.(iii) phospholipid type difference
the two contain different phospholipids. Compared with soybean phospholipids, the most striking feature of egg yolk phospholipids is that the PC content is high (up to 70% to 80%), basically free of phosphatidyl inositol (PI) and phospholipid acid (PA). A comparison of phospholipid components in egg yolks and soybeans is shown in the table below.
phospholipids |