TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The calcium salt is calcium chloride (CaCl2), calcium bromide (CaBr2), or calcium iodide (CaI2).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The method further involves using ion-exchange resins to remove cation and anion ions from the GPC mixture; and decolorizing the L- alpha GPC with a decolorant, where the decolorant is activated carbon or attapulgite. The method involves using a cation-exchange resin to remove cations from the GPC mixture; and using an anion-exchange resin to remove anions from the GPC mixture. In the method, the step (a) involves adding phospholipids in deionized water at a solid-liquid ratio of 1:10-1:30 g/ml; adding 2-10% (CaXn) (g): phospholipids (g) calcium salt (CaXn) and 190-950 U phospholipase A1/phospholipids (g); and incubating at 30-60 degrees C for 3-6 hours. The step (b) involves adding silica gel to a low carbon chain alcohol; adding GPC mixture to silica gel; eluting with 0-100% low carbon chain alcohol solution (volume:volume, alcohol:water); and collecting fractions at 10-60 ml/fraction. The weight of silica gel is 20-100 times of the weight of GPC mixture. The collection volumes of 1:1-1:50 (weight of GPC mixture (g): collection volume (ml)) are based on the weight of GPC mixture. Preferred Components: The phospholipid is food-grade Lecithin powder, alcohol-soluble phospholipids, or high purity phosphatidylcholine. The low carbon chain alcohol is methanol or ethanol.    TECHNOLOGY FOCUS - POLYMERS - Preferred Resin: The cation-exchange resin is a hydrogen form of a strong acid cation exchange resin, a weak acid cation exchange resin, or a macroporous type cation exchange resin. The anion exchange resin is a hydroxide form of a strong base anion exchange resin, a weak base anion exchange resin, or a macroporous type anion exchange resin. ACTIVITY - Nootropic; Neuroprotective. No biological data is given.    MECHANISM OF ACTION - None given.    EXAMPLE - A food-grade lecithin powder (having 20.3% of phosphatidylcholine) (50 g) was added to a flask with deionized water (500 ml) and stirred at 300 revolutions per minute (rpm). Then calcium chloride (2 g) and phospholipase A1 (9500 U/ml) (1 ml) were added into the raw material solution, and incubated at 35 degrees C for 3 hours. The insoluble material was removed from reaction mixture by centrifugation and vacuum filtration. Strong acid cation exchange resin was used to remove Ca2+, and macroporous acrylic weak acidic anion exchange resin was used to remove Cl- in the glycerylphosphorylcholine (GPC) mixture. Then the GPC mixture was dried at 60 degrees C, and dissolved in methanol. Using high-pressure liquid chromatography-evaporative light scattering detector (HPLC-ELSD) analysis, L- alpha -GPC (2.97 g) was obtained in the methanol solution. The silica gel (148.5 g) was dissolved in methanol, and silica gel column was prepared according to common procedure for the following separation; and eluted with 10% methanol solution (volume:volume, methanol:water) at the flow rate of 2 ml/minute, the elute was collected in 30 ml/fraction. Then fraction was combined with L- alpha -GPC after HPLC-ELSD analysis. The L- alpha -GPC fraction was decolorized with activated carbon at 90 degrees C for 1 hour, and dried under reduced pressure at 45 degrees C to give highly pure L- alpha -GPC (2.33 g, Yield: 78.4%).