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A difference in the metabolism of 1- and dl-tryptophane in the human

, : A difference in the metabolism of 1- and dl-tryptophane in the human. Jour Biol Chem 155(1): 101-108

The ingestion of dl-trypto-phane by the human resulted in the excretion of an indole compound which formed indigo red on the addition of I2 to the urine. This was not observed when l-tryptophane was fed. The excreted metabolite was not isolated, but some of its properties were detd. The study is interpreted as suggesting that the biologic value of dl-tryptophane is approx. 1/2 that of Z-tryptophane.


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