Molekula
L-Tryptophan (EP)
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
L-Tryptophan (EP) is an essential amino acid and precursor to serotonin and melatonin, widely used in dietary supplements, pharmaceuticals, and as a nutritional additive for its role in protein synthesis and mood regulation. This European Pharmacopoeia (EP)-grade chemical meets strict quality standards for human consumption and therapeutic applications. L-Tryptophan (CAS 73-22-3) has the molecular formula C11H12N2O2 with a molecular weight of 204.23. It is stored at ambient conditions and carries no signal word for hazard classification. Molekula supplies L-Tryptophan (EP) from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
Pack sizes & pricing
Pricing on request — packs available from research to bulk quantities.
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | White or almost white, crystalline or amorphous powder. |
| Impurity A | ≤10ppm |
| Specific rotation | 30.0° -33.0° |
| Loss on Drying | ≤0.5% |
| Chloride (Cl-) | ≤200ppm |
| Assay | 98.5-101.0% |
| Sulphated Ash | ≤0.1% |
| Heavy Metals (Pb) | ≤10ppm |
| Iron (Fe) | ≤20ppm |
| Ammonium (NH4+) | ≤200ppm |
| Sulphates (SO4)(2-) | ≤300ppm |
| Ninhydrin-positive substances | ≤0.5% |
| Sum of impurities with a retention time greater than that of tryptophan and up to 1.8 times the retention time of N-acetyltryptophan: | ≤300ppm |
| Sum of impurities with a retention time less than that of tryptophan: | ≤100ppm |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Odour | Odorless |
| Melting Point | 282 °C (decomposes) |
| Solubility (other solvents) | Slightly soluble in acetic acid, ethanol; insoluble in ethyl ether |
| pKa | pKa = 7.38 (at 25 °C) |
| log P (octanol/water) | -1.06 |
Source: PubChem CID 6305 (HSDB, DrugBank)
Identification
| Property | Value |
|---|---|
| SKU | 90031531 |
| CAS Number | 73-22-3 |
| IUPAC Name | (2S)-2-amino-3-(1H-indol-3-yl)propanoic acid |
| EC Number | 200-795-6 |
| Molecular Formula | C11H12N2O2 |
| Molecular Weight | 204.23 |
| Exact Mass | 204.0899 |
| SMILES | C1=CC=C2C(=C1)C(=CN2)C[C@@H](C(=O)O)N |
| InChIKey | QIVBCDIJIAJPQS-VIFPVBQESA-N |
| InChI | InChI=1S/C11H12N2O2/c12-9(11(14)15)5-7-6-13-10-4-2-1-3-8(7)10/h1-4,6,9,13H,5,12H2,(H,14,15)/t9-/m0/s1 |
| PubChem CID | 6305 |
| REACH Code | Y113 |
| TSCA Listed | Yes |
| HTS Code | 29339975 |
| Tariff Code | 2933998090 |
Safety & GHS
Precautionary statements
- P264 Wash thoroughly after handling
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P308+313 IF exposed or concerned: Get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Russian, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- (2S)-2-amino-3-(1H-indol-3-yl)propanoic acid
- (S)-Tryptophan
- Ardeytropin
- L-tryptophan
- L-Tryptophane
- Pacitron
- trofan
- tryptacin
- tryptophan
- Tryptophane
Frequently asked questions
What is L-Tryptophan (EP) used for?
L-Tryptophan (EP) is primarily used as a dietary supplement for its role in synthesizing serotonin and melatonin, supporting mood regulation, sleep, and protein metabolism.
What is the chemical formula and molecular weight of L-Tryptophan (EP)?
The chemical formula is **C11H12N2O2**, and the molecular weight is **204.23 g/mol**.
How should L-Tryptophan (EP) be stored?
Store at **ambient temperature** in a cool, dry place, away from direct sunlight and moisture.
What grade of L-Tryptophan (EP) does Molekula supply?
Molekula supplies **EP (European Pharmacopoeia) grade**, meeting strict purity standards for pharmaceutical and dietary supplement applications.
Can Molekula supply L-Tryptophan (EP) in bulk?
Yes, Molekula offers **bulk quantities** of L-Tryptophan (EP) to accommodate large-scale production needs.
What documentation comes with an order of L-Tryptophan (EP)?
Each order includes a **Certificate of Analysis (CoA)**, **Material Safety Data Sheet (MSDS)**, and **batch-specific documentation** for traceability.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.