PROCESS FOR PURIFYING A-UL-ASPARTYL-L-PHENYLALANINE LOWER ALKY L ESTERS

摘要

1377313 Alpha-L-aspartyl-L-phenylalanine alkyl esters AJINOMOTO CO Inc 14 May 1973 [25 May 1972] 22924/73 Heading C2C Alpha-L-aspartyl-L-phenylalanine C 1-4 alkyl esters contaminated at least with an alpha-L- aspartyl-alpha-L-aspartyl-L-phenylalanine C 1-4 alkyl ester are purified by contacting an aqueous solution of the contaminated ester at pH of 4 to 6 with a strongly basic anion exchange resin in weak organic acid salt form, and separating the contacted solution from the resin. The resin is preferably in the form of its acetic or formic acid salt and the preformed resin is a polystyrene having quaternary ammonium radicals.