The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 11, 1989
Filed:
Jan. 14, 1988
Applicant:
Inventors:
Assignee:
Ajinomoto Co., Inc., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
548496 ;
Abstract
A process for purifying tryptophan produced by microbial cells or an enzyme is disclosed. In this process, the microbial cells are separated, the solution containing tryptophan is treated at a pH in the range of 1 to 4 with activated carbon and a non-polar highly porous resin and crystallized under neutralization in the presence of a lower aliphatic alcohol or a lower aliphatic ketone. The thus purified tryptophan has a transmission of 95% and more.