title: A simple colorimetric method for the determination of tryptophan.
mesh_terms: D003124:Colorimetry / Q000379:methods; D005029:Ethylenediamines; D011506:Proteins; D014364:Tryptophan / Q000032:analysis*
chemical_list: D005029:Ethylenediamines; D011506:Proteins; D014364:Tryptophan