3.The preparation and analysis of new sweetener L aspartyl D alanine isopropyl ester were reported.L Asp D Ala OiPr was obtained from L aspartic acid and D alamine.

• 采用新工艺新方法制备新型甜味剂天-丙二肽，以L-天冬氨酸为中间体，与D-丙氨酸异丙酯缩合，一步反应得产物，产率高、成本低。