Method of stabilizing an alkali metal salt of a compound of the general formula or formula R 1 R 2 N-CHR 3 -COOH or R 1 R 2 N-CHR 3 CHR 3 -COOH, wherein R 1, R 2 and R 3 are independently H, an alkyl, an alkenyl, or a hydroxyalkyl radical containing from 1 to 18 carbon atoms, or from 1 to 6 carbon atoms; or wherein R 1 and R 2 form jointly together with the N atom a heterocyclic 5- or 6-membered ring; said method comprising providing a mixture comprising said salt, an alkali metal hydroxide and water, and subjecting the mixture to a step: reducing the quantity of said alkali metal hydroxide in the mixture wherein step comprises reducing the quantity of said alkali metal hydroxide in the mixture by subjecting the mixture to electrodialysis; or reducing the quantity of said alkali metal hydroxide in the mixture by adding an acid to the mixture and reducing the quantity of said alkali metal hydroxide in the mixture by subjecting the mixture to electrodialysis; wherein in step said electrodialysis is performed in an electrodialysis cell whose repeating unit consists of an anionic membrane and a cationic membrane and two compartments; or a bipolar membrane and a cationic membrane and two compartments; or a bipolar membrane and an anionic membrane and two compartments; or a bipolar membrane, an anionic membrane and a cationic membrane and three compartments; or an anionic membrane and a cationic membrane and two compartments wherein said alkali metal hydroxide comprised in said mixture is neutralized by addition of an acid prior to subjecting said mixture to electrodialysis; or two cationic membranes in a two compartment arrangement, and wherein said alkali metal hydroxide comprised in said mixture is neutralized by addition of an acid simultaneously to subjecting said mixture to electrodialysis; or two adjacent cationic membranes, one anionic membrane and three compartments, and wherein said alkali metal hydroxide comprised in said mixture is neutralized by addition of an acid simultaneously to subjecting said mixture to electrodialysis; or two adjacent anionic membranes, one cationic membrane and three compartments, and wherein said alkali metal hydroxide comprised in said mixture is neutralized by addition of an acid simultaneously to subjecting said mixture to electrodialysis; wherein the acid added in step is a compound of formula or formula; or wherein the acid added in step is obtained by subjecting at least a part of said mixture to ion exchange using an acidic ion exchanger. wherein R 1, R 2 and R 3 are independently H, an alkyl, an alkenyl, or a hydroxyalkyl radical containing from 1 to 18 carbon atoms, or from 1 to 6 carbon atoms; or wherein R 1 and R 2 form jointly together with the N atom a heterocyclic 5- or 6-membered ring; said method comprising providing a mixture comprising said salt, an alkali metal hydroxide and water, and subjecting the mixture to a step: reducing the quantity of said alkali metal hydroxide in the mixture wherein step comprises reducing the quantity of said alkali metal hydroxide in the mixture by subjecting the mixture to electrodialysis; or reducing the quantity of said alkali metal hydroxide in the mixture by adding an acid to the mixture and reducing the quantity of said alkali metal hydroxide in the mixture by subjecting the mixture to electrodialysis; reducing the quantity of said alkali metal hydroxide in the mixture wherein step comprises reducing the quantity of said alkali metal hydroxide in the mixture by subjecting the mixture to electrodialysis; or reducing the quantity of said alkali metal hydroxide in the mixture by adding an acid to the mixture and reducing the quantity of said alkali metal hydroxide in the mixture by subjecting the mixture to electrodialysis; reducing the quantity of said alkali metal hydroxide in the mixture by subjecting the mixture to electrodialysis; or reducing the quantity of said alkali metal hydroxide in the mixture by adding an acid to the mixture and reducing the quantity of said alkali metal hydroxide in the mixture by subjecting the mixture to electrodialysis; an anionic membrane and a cationic membrane and two compartments; or a bipolar membrane and a cationic membrane and two compartments; or a bipolar membrane and an anionic membrane and two compartments; or a bipolar membrane, an anionic membrane and a cationic membrane and three compartments; or an anionic membrane and a cationic membrane and two compartments wherein said alkali metal hydroxide comprised in said mixture is neutralized by addition of an acid prior to subjecting said mixture to electrodialysis; or two cationic membranes in a two compartment arrangement, and wherein said alkali metal hydroxide comprised in said mixture is neutralized by addition of an acid simultaneously to subjecting said mixture to electrodialysis; or two adjacent cationic membranes, one anionic membrane and three compartments, and wherein said alkali metal hydroxide comprised in said mixture is neutralized by addition of an acid simultaneously to subjecting said mixture to electrodialysis; or two adjacent anionic membranes, one cationic membrane and three compartments, and wherein said alkali metal hydroxide comprised in said mixture is neutralized by addition of an acid simultaneously to subjecting said mixture to electrodialysis; wherein the acid added in step is a compound of formula or formula; or wherein the acid added in step is obtained by subjecting at least a part of said mixture to ion exchange using an acidic ion exchanger.