Ajinomoto Co., Ltd.

Kazuhiro Hasegawa

Tetsuya Kaneko

Toshiya Tanabe

Chiaki Sano

Yutaka Okamoto

Toru Nakamura

Noriko Takahashi

Kinzo Iitani

Yasuhiro Maruta

Yuta Oguchi

Gaku Hamada

Keita Minami

[Problem] It is to provide a method of producing basic amino acid or basic amino acid salt suitable for each use for medicine, industrial use, feed, food additive and the like, by a simple method to remove HCl from HCl salt of basic amino acid efficiently. [Solving Means] The above problem is solved by a method of producing a basic amino acid or a basic amino acid salt which comprises allowing to coexist a weak acid in a basic amino acid HCl salt solution, when the solution is dechlorinated using an anion-exchange resin.

Method of producing basic amino acid or basic amino acid salt

Method for producing basic amino acid solution

Herein is disclosed an aqueous stable lysine solution containing an acid radical in such amount that the solubility of lysine therein has been increased than in the corresponding aqueous lysine base solution, whereby during storage of lysine in the form of a free-lysine solution (liquid composition), the precipitation of lysine base crystals due to the drop in temperature is prevented thereby improving the handling thereof during transportation (transfer) etc.

Aqueous stable lysine solution

A method for purifying an amino acid selected from the group consisting of valine, leucine and isoleucine easily in high yield and with high purity using an inexpensive precipitant, comprising allowing p-ethylbenzenesulfonic acid or its water-soluble salt to act on an aqueous solution containing an amino acid to form crystals of the amino acid p-ethylbenzenesulfonate and then separating and decomposing the crystals to purify and obtain the amino acid. The p-ethylbenzenesulfonic acid may be used as the free acid, an alkali metal salt and an ammonium salt.

Method for purifying branched chain amino acids

A process is provided for obtaining high-purity valine in high yield by a simple method using an inexpensive precipitant of p-isopropylbenzene sulfonic acid or a water-soluble salt thereof.

Process for purifying valine

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Kawasaki, Japan

Kazuhiro Hasegawa