Phosphatidycholine(PC) is commonly considered as one of the most important lecithin in biological activities and has main function in nutrition and health.Therefor, phosphatidylcholine has many functions in medical use,such as improving the activity of cells in man's cereba,building up memory,keeping young,defending aged dementia and cardiovascular disease,protecting liver,avoiding fatty liver and hepatocirrbosis,and so on.In addition,it also has wide applications in chemical industry,light industry...