Ajinomoto Co., Ltd.

Ajimomoto Co., Inc.

Kinzo Iitani

Tetsuya Kaneko

Toyokazu Kaneko

Masashi Miyazawa

Masaki Yamamoto

Shigenori Mori

Yutaka Okamoto

Toru Nakamura

Kazuhiro Hasegawa

Chiaki Sano

Ken-ich Yarita

Kenich Yarita

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 for recovering a high-purity L-amino acid from a fermentation liquor obtained by fermentation or an enzymic method, which comprises removing the impurities contained in said fermentation liquor by passing said fermentation liquor through an ultrafilter membrane and then through an ion-exchange or adsorbent resin; concentrating or cooling the effluent thus obtained to result in crystallization of said L-amino acid, and isolating said crystalline L-amino acid from said fermentation liquor.

Process for recovering L-amino acid from fermentation liquors

A process for recovering a high-purity L-amino acid from a fermentation liquor obtained by fermentation or an enzymic method, which comprises removing the impurities contained in said fermentation liquor by passing said fermentation liquor through an ultrafilter membrane and then through an ion-exchange or adsorbent resin; concentrating or cooling the effluent thus obtained to result in crystallization of said L-amino acid, and isolation said crystalline L-amino acid from said fermentation liquor.

Process for recovering L-amino acids from fermentation liquors

Growing community of inventors

Raleigh, NC, United States of America

Kinzo Iitani