Method for purifying tryptophan.

摘要

In a process for purifying tryptophan produced by microbial cells or an enzyme, 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. The thus purified tryptophan has a transmission of 95 % and more.