Ajinomoto Co., Ltd.

Naoko Sugiyama

Tadashi Takemoto

Toyoto Hijiya

Ryoichiro Nakamura

Toshihisa Kato

Shinji Fujita

Mikiya Kano

Yusuki Amino

An economical process for producing .alpha.-L-aspartyldipeptide amide derivatives useful as sweeteners, by using amino protecting groups which can be removed by hydrolysis under acidic conditions, resulting in conversion of a .beta.-carboxyl acid ester to a carboxylic acid.

Process for producing .alpha.-l-aspartyldipeptide amide derivatives

A process for improving the yield of crystallization of L-phenylalanine monomethyl sulfate from an aqueous solution containing L-phenylalanine and monomethyl sulfate, by adding an effective crystallization improving amount of a salt of an inorganic or organic acid with an alkali metal, an alkaline earth metal or ammonium, to the aqueous solution.

Process for crystallization of L-phenylalanine monomethyl sulfate using

A method of crystallizing phenylalanine in the form of .alpha.-crystals at a temperature below .alpha..fwdarw..beta. transition temperature comprises:

Method of crystallizing phenylalanine

Growing community of inventors

Kawasaki, Japan

Naoko Sugiyama