申请人:Ajinomoto Co., Inc.
公开号:US06335461B1
公开(公告)日:2002-01-01
In the separation and purification of N-[N-(3,3-dimethylbutyl)-L-&agr;-aspartyl]-L-phenylalanine methyl ester produced in the reductive alkylation of aspartame (APM) with 3,3-dimethylbutylaldehyde, the APM used in the starting material for the alkylation, which is difficult to be separated by recrystallization only from the crude crystals of the reaction product, can be separated and removed by extraction or solution thereof with the specified organic solvent from the concentrated reaction solution of the reductive alkylation or from the crude crystals of the product therefrom, and further N,N-di(3,3-dimethylbutyl)-APM as the by-product can be separated and removed by means for separation and purification, such as crystallization, chromatography, extraction, treatment with the activated charcoal, etc. As a result, N-[N-(3,3-dimethylbutyl)-L-&agr;-aspartyl]-L-phenylalanine methyl ester which is a sweetener having a high degree of sweetness can be purified efficiently, and also the APM derivative in a high purity is possibly produced industrially.
在对阿斯巴甜(APM)进行还原烷基化反应生成N-[N-(3,3-二甲基丁基)-L-α-天冬氨酰]-L-苯丙氨酸甲酯的分离和纯化过程中,难以通过从反应产物的粗晶体中仅经过重结晶分离的方式分离出用于烷基化反应的起始物质APM。但可以通过使用特定的有机溶剂从还原烷基化反应的浓缩反应液或产物的粗晶体中提取或溶解APM,进而将其分离和去除。此外,通过结晶、色谱、萃取、活性炭处理等分离和纯化方法,还可以分离和去除副产物N,N-二(3,3-二甲基丁基)-APM。因此,可以高效地纯化具有高甜度的N-[N-(3,3-二甲基丁基)-L-α-天冬氨酰]-L-苯丙氨酸甲酯甜味剂,并且还可以在工业上生产高纯度的APM衍生物。