Method for removing enzyme and method of base exchange or hydrolysis of phospholipid using the same
A method of removing an enzyme from a liquid enzyme reaction mixture used in a hydrolysis reaction or a base exchange reaction of a phospholipid is provided. The method includes the step of treating the liquid enzyme reaction mixture with a solvent mixture of water and an organic solvent, wherein the solvent mixture includes an inorganic metal salt, to remove the enzyme. Enzymes included in the reaction product can be easily removed without a treatment such as heating, and thus it becomes possible to easily produce various phospholipids that have a reduced risk of inducing an allergy, that retain a high quality and that have excellent storage stability.
1. A method of removing an enzyme from a liquid enzyme reaction mixture, comprising:
a. providing the liquid enzyme reaction mixture, wherein the liquid enzyme reaction mixture is produced by:
i. a phospholipid base exchange reaction comprising reacting, in the presence of an enzyme, a phospholipid with a compound having an alcoholic hydroxyl group, wherein the enzyme is capable of transferring a phosphatidyl group of the phospholipid to the compound, and wherein the compound having an alcoholic hydroxyl group is selected from the group consisting of an alcohol, a saccharide, and a cyclic compound having a hydroxyl group; or
ii. a phospholipid hydrolysis reaction comprising enzymatically hydrolyzing a phospholipid in the presence of water; and
optionally adding a protease to the phospholipid base exchange reaction (i) or the phospholipid hydrolysis reaction (ii) to deactivate the enzyme;
b. adding to the liquid enzyme reaction mixture an organic solvent; at least one inorganic metal salt selected from the group consisting of sodium salt, potassium salt, calcium salt, magnesium salt, and ammonium salt; and optionally water, to remove the enzyme and/or the protease and to wash the liquid enzyme reaction mixture, thereby removing the enzyme from the liquid enzyme reaction mixture;
wherein the enzyme is selected from the group consisting of lipase, phospholipase A 2 (PLA 2 ), and phospholipase D (PLD).
2. The method of claim 1 , wherein the organic solvent is a polar organic solvent.
3. The method of claim 2 , wherein the polar organic solvent is at least one solvent selected from the group consisting of acetone, ethanol, methanol, isopropanol, and glycerol.
4. The method of claim 1 , wherein in step (b) the adding comprises adding a solvent mixture comprising an organic solvent, an inorganic metal salt, and water to wash the liquid enzyme reaction mixture.
5. The method according to claim 4 , wherein the solvent mixture comprises:
a. water in an amount of 30 to 70% (v/v);
b. the organic solvent in an amount of 30 to 70% (v/v); and
c. the inorganic metal salt in an amount of 3 to 25% (w/v).