Molekula
DL-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
DL-Tryptophan is a synthetic amino acid used in nutritional supplements, pharmaceuticals, and research applications. It serves as a precursor to serotonin and melatonin, supporting neurological and metabolic functions. Available in powder form, it has a molecular weight of 204.23 g/mol, a molecular formula of C11H12N2O2, and a CAS number of 54-12-6. Stable at ambient temperatures, it requires no special storage conditions. Molekula supplies DL-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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25 g — £30.90 per pack ex VAT · £37.08 inc. VAT
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100 g — £63.70 per pack ex VAT · £76.44 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 to off-white crystalline powder |
| Water | ≤ 1.0% |
| Heavy metals | ≤ 10ppm |
| Loss on Drying | ≤ 0.5% |
| Chloride (Cl-) | ≤ 0.10% |
| Assay | 98.0 - 101.0% |
| Residue on Ignition | ≤ 0.2% |
| Iron (Fe) | ≤ 30ppm |
| Identification (IR) | Conforms to structure |
| Arsenic (As) | ≤ 1ppm |
| Ammonium (NH4+) | ≤ 0.02% |
| Sulphates (SO4)(2-) | ≤ 0.030% |
| pH (1% sol. 25°C) | 5.5 - 7 |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Melting Point | 293 °C |
| Boiling Point | 289 to 291 °C at 760 mmHg |
| pKa | pKa = 2.3 |
Source: PubChem CID 1148 (Human Metabolome Database (HMDB), ChEMBL)
Identification
| Property | Value |
|---|---|
| SKU | 57306313 |
| CAS Number | 54-12-6 |
| IUPAC Name | 2-amino-3-(1H-indol-3-yl)propanoic acid |
| EC Number | 200-194-9 |
| Molecular Formula | C11H12N2O2 |
| Molecular Weight | 204.23 |
| Exact Mass | 204.0899 |
| SMILES | C1=CC=C2C(=C1)C(=CN2)CC(C(=O)O)N |
| InChIKey | QIVBCDIJIAJPQS-UHFFFAOYSA-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) |
| PubChem CID | 1148 |
| REACH Code | Y113 |
| TSCA Listed | Yes |
| HTS Code | 2933.99.8290 |
| Tariff Code | 2933998090 |
Safety & GHS
Precautionary statements
- P280 Wear protective gloves/protective clothing/eye protection/face protection
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
- (+-)-Tryptophan
- 2-amino-3-(1H-indol-3-yl)propanoic acid
- DL-tryptophane
- DL-Trytophan
- DL3betaIndolylalanine
- DLalphaAmino3indolepropionic acid
- DLTrytophane
- H-DL-Trp-OH
- Racemic Tryptophan
- Tryptophan, DL
Frequently asked questions
What is DL-Tryptophan used for?
DL-Tryptophan is primarily used as a nutritional supplement and precursor to serotonin and melatonin, and is also used in research and pharmaceutical applications.
What is the chemical formula and molecular weight of DL-Tryptophan?
The formula is C11H12N2O2 with a molecular weight of 204.23 g/mol.
How should DL-Tryptophan be stored?
It should be stored at ambient temperature, protected from moisture and light.
What grade of DL-Tryptophan is available?
We offer pharmaceutical and research-grade DL-Tryptophan.
Can Molekula supply DL-Tryptophan in bulk?
Yes, we can supply DL-Tryptophan in bulk quantities—please contact us for pricing and availability.
What documentation comes with a DL-Tryptophan order?
Each order includes a Certificate of Analysis (CoA) and safety data sheet (SDS); additional documentation is available upon request.
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.