Molekula
L-Leucine
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-Leucine is an essential branched-chain amino acid used in nutritional supplements, cell culture media, and metabolic research. It plays a key role in protein synthesis and muscle recovery. Available in powder form with a purity of ≥98%, CAS number 61-90-5, molecular formula C6H13NO2, and molecular weight 131.17 g/mol. Stored at ambient temperature. Molekula supplies L-Leucine 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 — £30.90 per pack ex VAT · £37.08 inc. VAT
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1 kg — £107.50 per pack ex VAT · £129.00 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 or almost white crystalline powder or shiny flakes |
| Impurity | ≤2.0% |
| Specific rotation | +14.9 to +17.3° |
| Identification | Conforms to reference |
| pH | 5.5-7.0 |
| Loss on Drying | ≤0.2% |
| Chloride (Cl-) | ≤0.05% |
| Assay | 98.5 to 101.5% |
| Residue on Ignition | ≤0.4% |
| Iron (Fe) | ≤30ppm |
| Sulphates (SO4)(2-) | ≤0.03% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | White crystals |
| Melting Point | 293 °C |
| Density | 1.293 g/cm³ at 18 °C |
| Water Solubility | 21.5 g/L at 25 °C |
| Solubility (other solvents) | Soluble in water, acetic acid, dilute HCl, and alkaline hydroxides and carbonates |
| Vapour Pressure | 0.00000001 mmHg |
| pKa | pKa = 2.35 (at 13 °C) |
| log P (octanol/water) | -1.52 |
Source: PubChem CID 6106 (HSDB, DrugBank, Joint FAO/WHO Expert Committee on Food Additives (JECFA), Haz-Map)
Identification
| Property | Value |
|---|---|
| SKU | 17954292 |
| CAS Number | 61-90-5 |
| IUPAC Name | (2S)-2-amino-4-methylpentanoic acid |
| EC Number | 200-522-0 |
| Molecular Formula | C6H13NO2 |
| Molecular Weight | 131.17 |
| Exact Mass | 131.0946 |
| SMILES | CC(C)C[C@@H](C(=O)O)N |
| InChIKey | ROHFNLRQFUQHCH-YFKPBYRVSA-N |
| InChI | InChI=1S/C6H13NO2/c1-4(2)3-5(7)6(8)9/h4-5H,3,7H2,1-2H3,(H,8,9)/t5-/m0/s1 |
| PubChem CID | 6106 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 29224949 |
| Tariff Code | 2922498590 |
Safety & GHS
Precautionary statements
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P264 Wash thoroughly after handling
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P403+233 Store in a well ventilated place. Keep container tightly closed
- P501 Dispose of contents/container to an approved waste disposal plant
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, 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-4-methylpentanoic acid
- (S)-2-Amino-4-methylpentanoic acid
- (S)-2-Amino-4-methylvaleric acid
- (S)-Leucine
- L-alpha-Aminoisocaproic acid
- Leucin
- Leucina
- leucine
- LEUCINE, L-
- Leucinum
Frequently asked questions
What is L-Leucine used for?
L-Leucine is primarily used in nutritional supplements and research applications as an essential branched-chain amino acid for protein synthesis and muscle recovery.
What is the chemical formula and molecular weight of L-Leucine?
The chemical formula is C6H13NO2 and the molecular weight is 131.17 g/mol.
How should L-Leucine be stored?
L-Leucine should be stored at ambient temperature, protected from moisture and light.
What grade of L-Leucine is available?
Molekula supplies L-Leucine in research grade, suitable for laboratory and analytical use.
Can Molekula supply L-Leucine in bulk?
Yes, Molekula can supply L-Leucine in bulk quantities; please contact our sales team for pricing and availability.
What documentation comes with an order of L-Leucine?
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.