Ajinomoto Co., Ltd.

Ichiro Fuke

Takehiko Chikamori

Yasuhiko Toride

Shuichi Endo

Mathilde Crombez

Loïc Le Tutour

François Lefebvre

Seiji Funatsu

The present invention provides a mixed aqueous solution of L-lysine and L-threonine, which is industrially useful as an animal feed ingredient. The solution is stable, concentrated, and has good handleability. Therefore, a mixed aqueous solution of L-lysine and L-threonine is provided which contains L-lysine, L-threonine, and water. The solution has a viscosity of 3300 cp or less at 20&#xb0; C., a pH of 10-13, and a total concentration of L-lysine and L-threonine in the mixed aqueous solution of 70 g/100 g of water or more.

Mixed aqueous solution of L-lysine and L-threonine and method of preparing same

A method for the crystallization of tryptophan, comprising storing a tryptophan solution at a pH of 8 to 13 and at a temperature of room temperature to 100&deg; C. for 0.5 hour to 1 week and then, followed by crystallization.

Method for crystallizing tryptophan

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Kawasaki, Japan

Ichiro Fuke