tryptophan

[trip´to-fan]

a naturally occurring amino acid, one of the essential amino acids; it is a precursor of serotonin. Adequate levels in the diet may mitigate pellagra by compensating for deficiencies of niacin.

tryp·to·phan (Trp, W),

(trip'tō-fan),

2-Amino-3-(3-indolyl)propionic acid; the l-isomer is a component of proteins; a nutritionally essential amino acid.

Farlex Partner Medical Dictionary © Farlex 2012

tryptophan

(trĭp′tə-făn′) also

tryptophane

(-fān′)

An essential amino acid, C₁₁H₁₂N₂O₂, formed from proteins during digestion by the action of proteolytic enzymes. It is necessary for normal growth and development and is the precursor of several substances, including serotonin and niacin.

tryptophan

An essential amino acid, which is a key building block in protein biosynthesis. It is a precursor for serotonin (a neurotransmitter) and niacin (a B vitamin).

Dietary sources
Milk, sesame seeds, soy beans, spirulina, sunflower seeds, cashews.

Fringe nutrition
Tryptophan has been promoted for its alleged ability to induce sleep, and as an antidepressint.

tryp·to·phan

(W) (trip'tŏ-fan)

A nutritionally essential amino acid; the l-isomer is a component of proteins.

Medical Dictionary for the Health Professions and Nursing © Farlex 2012

tryptophan

An antidepressant drug. L-tryptophan, sold in USA as a non-prescription food additive was withdrawn by the American Food and Drugs Administration (FDA) because of reports of a severe muscle disorder apparently caused by an unidentified contaminant. It is used only by hospital specialists who are aware of the risks. A brand name is Optimax.

Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

Fig. 306 Tryptophan . Molecular structure.

tryptophan (W, Trp)

one of 20 AMINO ACIDS common in protein. It has a nonpolar ‘R’ group structure and is relatively insoluble in water. See Fig. 306 . The ISOELECTRIC POINT of tryptophan is 5.9.

Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

Tryptophan

An essential amino acid that has to consumed in the diet because it cannot be manufactured by the body. Tryptophan is converted by the body to niacin, one of the B vitamins.

Mentioned in: Hartnup Disease

tryp·to·phan

(Trp, W) (trip'tŏ-fan)

A nutritionally essential amino acid.

Medical Dictionary for the Dental Professions © Farlex 2012

Mentioned in

References in periodicals archive

On tryosine and tryptophane determination in proteins.

Plant phenolics in allelopathy

Effect of gene dosage on tryptophane synthetase activity in Saccharomyces cerevisiae.

Genetical population structure in plants: gene flow between diploid sexual and triploid asexual dandelions (Taraxacum section Ruderalia)

Both milk and cream, whether 'au naturel' or vegetable product contain significant amounts of Tryptophane, an amino acid which promotes sleep.

Does coffee really cause insomnia?

The reasons for best FCR with the 75% replacement level may be due to a more optimal supply of essential amino acid profile (particularly tryptophane), nutrient digestibility and an increased rate of protein accumulation (Khan et al., 2015).

Silkworm (Bombyx mori) Meal as Alternate Protein Ingredient in Broiler Finisher Ration

Ciocalteu, On Tyrosine and Tryptophane Determinations in Proteins, J.

Determination of Chemical Composition, Total Phenolic Content and Antioxidant Activity of Xylanthemum Macropodum

Taking into account special medico-biological significance of free amino acids in functional products, researchers estimated the degree of impact of L-amino acids mix (leucine, isoleucine, valine, arginine, lysine, threonine, tryptophane, histidine, alanine, proline, serine, glycine) together with bacterial agent PBK-BR on uncooked smoked sausages, as well as impact of hydrolysates of hydrobionts and starter culture PB-MP on the quantitative content of free amino acids in restructured ham products.

Biotechnology of uncooked smoked meat products with biocorrective property

Effects of tyrosine and tryptophane ingestion on plasma catecholamine and 3, 4,-di hydroxyphenylacetic acid concentrations.

Alternative medicine applications for cognitive functioning in elderly populations

[18.] Folin O and V Ciocalteu On tyrosine and tryptophane determination in proteins.

Retention of phenolics, carotenoids, and antioxidant activity in the Taiwanese sweet potato (Ipomoea batatas Lam.) CV Tainong 66 subjected to different drying conditions

The peptide concentration was determined spectrophotometrically at 280 nm using an extinction coefficient of 5500 [M.sup.-1] [cm.sup.-1] (Pace et al., 1995) for both tryptophane containing peptides and confirmed by amino acid analysis after acid hydrolysis.

The effect of solvent composition on complex formation of S100B protein with peptides/solvendi koostise moju S100B-valgu kompleksi moodustumisele peptiididega

The biochemical reactions tested with API test are: production of indole; utilization of citrate; production of nitrite; fermentations of glucose, mannitol, inositol, sorbitol, rhamnose, sucrose, melibiose, amygdaline, and arabinose; production of [H.sub.2]S; activities of beta-galactosidase, tryptophane desaminase, gelatinase, arginine dihydrolase, lysine decarboxylase, and ornithine decorboxylase; formation of acetoin from pyruvate and oxidase (MacDonell et al.

Indicator and other bacteria in striped Venus (Chamelea gallina, L.) and wedge clam (Donax trunculus) from the northern coast of the sea of Marmara, Turkey