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Flavor enhancer.
Ingredients / Amino acids / L-Leucine
Amino acids
L-Leucine (E 641)
L-leucine for U.S. manufacturers, from vetted producers. FCC / USP grade on request. Download the sample spec sheet, then send us your grade and quantity.
TRACED · CERTIFIED · RELIABLE · TRANSPARENT · TESTED
Key facts
| CAS No. | 61-90-5 |
|---|---|
| E-number (EU) | E 641 |
| Synonyms | 2-Aminoisobutylacetic acid, L-2-Amino-4-methylvaleric acid, alpha-Aminoisocaproic acid, (S)-2-Amino-4-methylpentanoic acid, L-Leu |
| Chemical formula | C6H13NO2 |
| Description | White or almost white crystalline powder or shiny flakes |
| Solubility | Soluble in water, acetic acid, dilute HCl and alkaline hydroxides and carbonates; slightly soluble in ethanol |
| Grades | EU Reg. 231/2012 (E 641) sample spec · FCC / USP available on request for U.S. food/pharma use |
| Origin | Confirmed in every offer; stated per lot on the COA |
| Storage, shelf life, packaging | Per the producer's specification, on request |
What L-leucine is
Chemical name: L-Leucine. Formula C6H13NO2. White or almost white crystalline powder or shiny flakes. Soluble in water, acetic acid, dilute HCl and alkaline hydroxides and carbonates; slightly soluble in ethanol. (Source: EU Regulation 231/2012, E 641.)
Applications by industry
Sample specification
Values from EU Regulation 231/2012 (E 641), consolidated text of 18.08.2026. Actual values depend on the producer; the producer's specification and the COA for your lot are available on request.
| Assay | Content not less than 98,5 % and not more than 101,0 % on the anhydrous basis |
|---|---|
| Loss on drying | Not more than 0,5 % (100 °C – 105 °C) |
| Sulphated Ash | Not more than 0,1 % |
| Chlorides | Not more than 200 mg/kg |
| Sulphates | Not more than 300 mg/kg |
| Ammonium | Not more than 200 mg/kg |
| Iron | Not more than 10 mg/kg |
| Arsenic | Not more than 3 mg/kg |
| Lead | Not more than 5 mg/kg |
| Mercury | Not more than 1 mg/kg |
Download the full spec sheet (PDF)
Documents and sourcing
Droplet promise. Origin confirmed in every offer. Sample lot record on request, from the producer. SDS, allergen and other statements on request. We work with vetted producers and give you access to U.S.- and EU-stocked material through our partner network.
Data sheet, SDS and COA on request. Every delivery ships with a COA linked to the delivered lot.
Questions buyers ask
What is L-leucine used for?
Typical uses by industry. Food & beverage: Flavor enhancer. Suitability for your product and market is confirmed with the producer's specification.
Which grades can McBoeck supply?
Food grade to EU Regulation 231/2012 (E 641). FCC / USP grade is available on request for U.S. food and pharma use. Particle size and other grade details follow the producer's specification, on request.
Which documents come with L-leucine?
Every delivery ships with a COA linked to the delivered lot. Origin confirmed in every offer. Sample lot record on request, from the producer. SDS, allergen and other statements on request.
What does the sample spec sheet show?
Limits for assay, loss on drying, sulphated ash, chlorides, sulphates, ammonium, iron, arsenic, lead and mercury, taken from EU Regulation 231/2012. Actual values depend on the producer; the producer's specification and the lot COA are available on request.
How do I get a quote?
Send us the grade, quantity and delivery location through the quote form or at [email protected]. We work with vetted producers and give you access to U.S.- and EU-stocked material through our partner network.
Related amino acids
GlycineL-Cysteine HydrochlorideL-Glutamic AcidMonosodium GlutamateAll amino acids
Need L-leucine?
Send us the grade, quantity and delivery location. Email [email protected] or call +1 (713) 766-6811.