Method for the purification of betaines
The invention relates to a method for purification of synthetically-produced compounds, comprising a betaine structure in the molecule, for example, indocyan green, characterized in that reaction by-products, starting materials and/or other impurities such as NaI used during production are separated by extraction.
1. Method for purification of a synthetically produced chemical substance indocyanine green that contains a betaine structure in the molecule comprising
removing by extraction a reaction by-product sodium iodide using an organic solvent.
2. Method according to claim 1 ,
wherein the extraction is carried out with methylene chloride as the organic solvent.
3. Method according to claim 1 ,
wherein the extraction is carried out continuously.
4. Method according to claim 3 ,
wherein the extraction is carried out by means of the Soxhlet method.