title: Acetic anhydride requirement in the colorimetric determination of tryptophan.
mesh_terms: D000085:Acetates / Q000592:standards; D000812:Anhydrides; D003124:Colorimetry; D008722:Methods; D014364:Tryptophan / Q000032:analysis*; D003313:Zea mays / Q000032:analysis
chemical_list: D000085:Acetates; D000812:Anhydrides; D014364:Tryptophan