Patents Assigned to Mitsui Toatsu Chamicals, Inc.
  • Process for purifying tryptophan
    Patent number: 5057615
    Abstract: A process for purifying tryptophan is disclosed. In the process of the present invention, tryptophan is recrystallized in water-containing acetic acid. By the process of the present invention, tryptophan with high purity may be obtained with high yield without condensation or neutralization.
    Type: Grant
    Filed: June 26, 1990
    Date of Patent: October 15, 1991
    Assignee: Mitsui Toatsu Chamicals, Inc.
    Inventors: Yoshitsugu Kono, Hiroyuki Itoh, Ryoichi Taneda, Tsugio Watanabe