title: Determination of tryptophan and indole substances by a colorimetric diazotisation method.
mesh_terms: D001391:Azo Compounds; D003124:Colorimetry / Q000379:methods*; D007211:Indoles / Q000032:analysis*; D008722:Methods; D011492:Protein Hydrolysates / Q000032:analysis; D014364:Tryptophan / Q000032:analysis*
chemical_list: D001391:Azo Compounds; D007211:Indoles; D011492:Protein Hydrolysates; D014364:Tryptophan