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Product Details:


Product Description


Name:  L-Tryptophan
Synonyms:  L(-)-Tryptophan; (S)-2-Amino-3-(1H-indol-3-yl)propanoic acid; L-alphs-Amino-3-indolepropionic acid; Indole-3-alanine; Trp
Molecular Structure:  
Molecular Formula:  C11H12N2O2
Molecular Weight:  204.23
CAS Number:  73-22-3
EINECS:  200-795-6

L-Tryptophan is a natural anti-depressant, plentiful in protein foods but largely lost through cooking and processing. L-Tryptophan is a naturally occurring amino-acid. It is a precursor for the mood-regulating serotonin the brain neurotransmitter linked with pleasure and fulfilment. L-Tryptophan's is used to alleviate depression, support withdrawal and to aid weight loss. L-Tryptophan plays an important role in our diets, and aging individuals are often in need of it as a supplement.

Tryptophan is a kind of white or a kind of white to yellowish crystalline powder, smell-less or slight smelly, L- type has the bitter taste, the DL- and the D- type have little sweet taste. 289 oC decompounds, slightly soluble in water, does not dissolve in the ethyl: Dissolves in the diluted acid or the diluted alkali, the long time illumination will color up; heat together with water can produce the water a small amount of indole, like when heat up under the sodium hydroxide, the cupric sulfate existence, then will produce massive indole; heats up with the acid in the hidden place will be more stable; when coexist with Medicine bulk drugs, carbohydrate, and aldehyde, it is extremely easy to decompose.

Tryptophan is heterocyclic amino acid, is a kind of important and necessary amino acids for human body. It is widely applied in pharmaceutical and food fields.

Product name


Test Items

Specifications (USP24)


Off-white crystals



Specific rotation

-29.4o to -32.8o



Loss on drying

0.3% Max

Residue ignition

0.1% Max


0.05% Max


0.02% Max


0.03% Max


30ppm Max

Heavy metals

15ppm Max

Package: 25kgs per drum.

Storage: Stored in a dry and cool place, keep away from strong light and heat.

Shelf life:    Two years when stored properly in a well-closed container.   
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