Molekula
L-Isoleucine
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-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
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 — $58.70 per pack
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1 kg — $352.20 per pack
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.
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.