Amino Acids & Peptides
REACH
L-tryptophan
CAS Number
73-22-3
EC Number
200-795-6
Abbreviation
L-Trp
What is L-tryptophan?
L-Tryptophan (CAS 73-22-3) is an essential amino acid the human body cannot synthesize. Also known as L-Trp.
Where is L-tryptophan used?
- Dietary supplements and functional foods: capsules, tablets and fortified beverages for sleep support and mood-related nutrition
- Pharmaceuticals: active ingredient or excipient in amino acid infusion solutions and parenteral nutrition
- Animal feed: corrects tryptophan-deficient diets in swine and poultry
- Personal care: humectant in amino acid-based moisturizing formulations
- In biological systems it acts as a precursor to serotonin and melatonin.
Good to know: Dietary and supplemental sourcing is critical for food and pharmaceutical manufacturers. Food-grade (FCC), USP and pharmaceutical-grade specifications are available; bulk supply is standard for feed and food, while pharmaceutical-grade material comes in smaller, documented quantities for GMP manufacturing and laboratory use.
Commercial specifications
- Bulk supply standard for feed and food applications
Other Names (Synonyms)
(2S)-2-azaniumyl-3-(1H-indol-3-yl)propanoate|Trp|L-β-3-indolylalanine|L-Trp|L-beta-3-Indolylalanine|L-alpha-Amino-3-indolepropionic acid|Indole-3-alanine|(S)-α-amino-1H-indole-3-propanoic acid
What are the physical properties of L-tryptophan?
Melting Point 282 °C
Boiling Point 342.72°C (rough estimate)
Density 1.34
Appearance White to off-white crystalline powder
Color White to yellow-white
Odor wh. cryst. or cryst. odorless powd., sl. bitter taste
Form powder
Water Solubility 11.4 g/L (25 ºC)
Refractive Index -32 ° (C=1, H2O)
pH 5.5-7.0 (10g/l, H2O, 20℃)
Log P 0.704 (est)
Which trade and regulatory codes apply to L-tryptophan?
HS Code 29339990
Storage Class 11 - Combustible Solids
WGK (Germany) 2