tryptophan

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tryptophan An essential amino acid. In addition to its role in protein synthesis, it is the precursor of the neurotransmitter 5‐hydroxytryptamine (serotonin) and of niacin. Average intakes of tryptophan are more than adequate to meet niacin requirements without the need for any preformed niacin in the diet.

It is destroyed by acid, and therefore not measured when proteins are hydrolysed by acid before analysis; determination of tryptophan requires alkaline or enzymic hydrolysis of the protein.

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tryptophan (trip-tŏ-fan) n. an essential amino acid. See also amino acid.

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tryptophan A heterocyclic, non-polar, alpha amino acid.

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tryptophan See amino acid.