Home » Products » Amino Acid » L-Tryptophan

Chemical formula: C11H12N2O2
Molecular weight: 204.23
CAS no.: 73-22-3

Descriptions of L-Tryptophan
L-Tryptophan is a white or yellowish crystal or crystalline powder, with slight bitterness. The melting point is 289℃. It is slightly soluble in water, and insoluble in ethanol and ether.

L-Tryptophan is one of the essential amino acids for human and animal. It is mainly used in the following industries.
1. In medical industry, it is mainly used in formatting complex amino acid perfusion and preparation.
2. In food and feed industry, it is mainly used as a nutritional supplement.


Items Pharma Grade(USP32) Food Grade(FCC V) Feed Grade
Appearance White crystalline powder White crystalline powder Yellowish crystalline powder
Assay 98.5% ~ 101.5% 98.5% ~ 101.5% ≥98.0%
Specific rotation 29.4º ~ -32.8º -30.0º ~ -33.0º -30.0º~ -32.5º
PH 5.5 ~ 7.0 5.5 ~ 7.0 5.4~6.4
Loss on drying ≤0.3% ≤0.3% ≤1.0%
Residue on ignition ≤0.1% ≤0.1% ≤1.0%
Chloride ≤0.05% -- --
Sulphate ≤0.03% -- --
Iron ≤0.003% -- --
Heavy metals ≤15ppm -- ≤20ppm
Lead -- ≤5ppm --
Arsenic ≤1ppm ≤1ppm ≤5ppm

Package: 25KG kraft paper bags or in fiber drum.
Shelf Life: 2 years
Storage: Prevent from sunshine or rain, stored in shaded, cool and dry places.

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