Molekula
L-Isoleucine
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-Isoleucine is an essential branched-chain amino acid critical for protein synthesis, muscle repair, and energy metabolism in humans and animals. It is widely used in dietary supplements, sports nutrition, clinical nutrition, and as a building block in peptide synthesis. This white crystalline powder has a CAS number of 73-32-5, a molecular formula of C6H13NO2, and a molecular weight of 131.17. It is non-hazardous, requiring only ambient storage conditions. Molekula supplies L-Isoleucine 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.
Often bought together
Pricing & pack sizes
In stock — same-day dispatch
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.
-
100 g — £30.90 per pack ex VAT · £37.08 inc. VAT
-
1 kg — £185.40 per pack ex VAT · £222.48 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/ off white powder |
| Specific rotation | +38.9 to +41.8 |
| Heavy metals | ≤15ppm |
| Identification | Conforms to reference |
| pH | 5.5 - 7 |
| Loss on Drying | ≤0.3% |
| Assay | 98.5 - 101.5% |
| Residue on Ignition | ≤0.3% |
| Iron (Fe) | ≤30ppm |
| Arsenic (As) | ≤1.5ppm |
| Sulphates (SO4)(2-) | ≤0.03% |
| Chlorine (Cl) | ≤0.05% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | Crystals |
| Melting Point | 284 °C (decomposes) |
| Water Solubility | 34.4 g/L at 25 °C |
| Solubility (other solvents) | Sparingly soluble in hot alcohol (0.13% wt/wt at 80 °C), hot acetic acid. Insoluble in ether |
| Vapour Pressure | 0.00000001 mmHg |
| pKa | pKa = 2.37 (at 0 °C) |
| log P (octanol/water) | -1.72 |
Source: PubChem CID 6306 (HSDB, Haz-Map, DrugBank)
Identification
| Property | Value |
|---|---|
| SKU | 15495360 |
| CAS Number | 73-32-5 |
| IUPAC Name | (2S,3S)-2-amino-3-methylpentanoic acid |
| EC Number | 200-798-2 |
| Molecular Formula | C6H13NO2 |
| Molecular Weight | 131.17 |
| Exact Mass | 131.0946 |
| SMILES | CC[C@H](C)[C@@H](C(=O)O)N |
| InChIKey | AGPKZVBTJJNPAG-WHFBIAKZSA-N |
| InChI | InChI=1S/C6H13NO2/c1-3-4(2)5(7)6(8)9/h4-5H,3,7H2,1-2H3,(H,8,9)/t4-,5-/m0/s1 |
| PubChem CID | 6306 |
| REACH Code | Y113 |
| TSCA Listed | Yes |
| HTS Code | 29224980 |
| Tariff Code | 2922498590 |
Safety & GHS
Precautionary statements
- P264 Wash thoroughly after handling
- 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.
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,3S)-2-Amino-3-methylpentanoic acid
- (S,S)-Isoleucine
- (S)-Isoleucine
- 2-Amino-3-methylvaleric acid
- 2S,3S-Isoleucine
- alpha-Amino-beta-methylvaleric acid
- erythro-L-Isoleucine
- Isoleucina
- Isoleucine
- L-Ile
Frequently asked questions
What is L-Isoleucine commonly used for?
L-Isoleucine is primarily used as a dietary supplement to support muscle growth, immune function, and energy regulation, and is also an essential amino acid in protein synthesis.
What is the chemical formula and molecular weight of L-Isoleucine?
The chemical formula is **C₆H₁₃NO₂**, and the molecular weight is **131.17 g/mol**.
How should L-Isoleucine be stored?
Store L-Isoleucine at **ambient temperature** in a dry, well-ventilated area, away from moisture and strong oxidizing agents.
What grades of L-Isoleucine does Molekula supply?
Molekula supplies **pharmaceutical-grade (USP/EP/BP)** and **food-grade** L-Isoleucine, depending on the application requirements.
Can Molekula supply L-Isoleucine in bulk quantities?
Yes, Molekula can supply L-Isoleucine in bulk, with packaging options ranging from kilograms to metric tons, subject to order volume and specifications.
What documentation comes with an order of L-Isoleucine?
Each order includes a **Certificate of Analysis (CoA)**, **Material Safety Data Sheet (MSDS)**, and, if applicable, **pharmaceutical-grade documentation** such as USP/EP/BP compliance certificates.
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.