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DL-Tryptophan is an amino acid precursor of serotonin and melatonin. It is a dietary supplement for use as an antidepressant, anxiolytic, and sleep aid. DL-tryptophan also can be used as feed nutrition enhancer, antioxidants.
Kent K. Stewart and Robert F. Doherty. Resolution of DL-Tryptophan by Affinity Chromatography on Bovine-Serum Albumin-Agarose Columns. Current Issue.1973,70 (10), 2850-2852.
H. R. Snyder; Curtis W. Smith. A Convenient Synthesis of dl-Tryptophan..J. Am. Chem. Soc.1944,66 (3), 350-351.