Molekula
L-Tryptophan (EP)
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 1999 · 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.
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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.
Quality certificates
Molekula Group is certified to ISO 9001:2015 (quality) and ISO 14001:2015 (environmental management), audited by a UKAS-accredited body. Both certificates are valid to 17 May 2028.
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.