Molekula
L-Tryptophan
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 is an essential amino acid used in nutritional supplements, pharmaceuticals, and research. It serves as a precursor to serotonin and melatonin, supporting mood and sleep regulation. Available in powder form, it has a CAS number of 73-22-3, molecular formula C11H12N2O2, and a molecular weight of 204.23 g/mol. Stable at ambient storage conditions. Molekula supplies L-Tryptophan 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
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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100 g — £85.00 per pack ex VAT · £102.00 inc. VAT
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500 g — £195.00 per pack ex VAT · £234.00 inc. VAT
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1 kg — £280.00 per pack ex VAT · £336.00 inc. VAT
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 Powder |
| Specific rotation | -29.4 to -32.8 |
| Identification | Conforms to reference |
| pH | 5.5 to 7.0 |
| Loss on Drying | ≤ 0.3% |
| Specification | Conforms to USP specification |
| Chloride (Cl-) | ≤ 0.05% |
| Assay | ≥ 98.5% |
| Residue on Ignition | ≤ 0.1% |
| Iron (Fe) | ≤ 0.003% |
| Lead (Pb) | ≤ 0.0015% |
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 | 13831082 |
| 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, Portuguese, 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
- Indole-3-alanine
- L-Tryptophane
- Pacitron
- trofan
- tryptacin
- tryptophan
- Tryptophane
Frequently asked questions
What is L-Tryptophan used for?
L-Tryptophan is primarily used as a dietary supplement and in the synthesis of serotonin and melatonin, supporting mood regulation and sleep cycles.
What is the chemical formula and molecular weight of L-Tryptophan?
The formula is C11H12N2O2 with a molecular weight of 204.23 g/mol.
How should L-Tryptophan be stored?
Store at ambient temperature, protected from moisture and light.
What grade of L-Tryptophan does Molekula supply?
Molekula supplies L-Tryptophan in pharmaceutical and research grade.
Can Molekula supply L-Tryptophan in bulk?
Yes, Molekula can supply L-Tryptophan in bulk quantities; please contact sales for details.
What documentation comes with an order of L-Tryptophan?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS).
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.