By simultaneously carrying out an isomerization reaction at position 2 of monatin in different configurations at positions 2 and 4 in the presence of an aldehyde under a condition of pH 4 to 11 in a mixture solvent of water and an organic solvent, and the crystallization of monatin in the same configurations at positions 2 and 4 or a salt thereof, monatin useful as a sweetener, particularly optically active monatin can efficiently be produced.
通过在pH值为4到11的
水和有机溶剂混合物中存在醛的情况下,在不同的构型位置2和4中同时进行异构化反应,并在相同的构型位置2和4或其盐中结晶,可以高效地生产用作
甜味剂的莫纳丁,特别是光学活性莫纳丁。