Molekula
L-(+)-Selenomethionine
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-(+)-Selenomethionine is a selenium-containing amino acid used in nutritional supplements and biochemical research to study selenium metabolism and antioxidant functions. It is a white to off-white crystalline powder with a molecular formula of C5H11NO2Se and a molecular weight of 196.11 g/mol. It is classified as a hazardous substance with a signal word of Danger and must be stored at temperatures between -15 and -20 °C. Molekula supplies L-(+)-Selenomethionine 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.
-
1 g — £57.60 per pack ex VAT · £69.12 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 powder |
| Loss on Drying | ≤1.0% |
| Assay | ≥98% |
| Carbon (C) | 29.5% - 31.5% |
| Identification (IR) | Conforms to reference |
| Selenium (Se) | 37.2% - 42.9% |
| Nitrogen (N) | 6.6% - 7.6% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | -15 to -20 °C |
| Flash Point | 100 °C |
| Transport Class | 6.1 |
| Packing Group | III |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Melting Point | 275 °C |
Source: PubChem CID 105024 (Human Metabolome Database (HMDB))
Identification
| Property | Value |
|---|---|
| SKU | 24764032 |
| CAS Number | 3211-76-5 |
| IUPAC Name | (2S)-2-amino-4-methylselanylbutanoic acid |
| Molecular Formula | C5H11NO2Se |
| Molecular Weight | 196.11 |
| Exact Mass | 196.9955 |
| SMILES | C[Se]CC[C@@H](C(=O)O)N |
| InChIKey | RJFAYQIBOAGBLC-BYPYZUCNSA-N |
| InChI | InChI=1S/C5H11NO2Se/c1-9-3-2-4(6)5(7)8/h4H,2-3,6H2,1H3,(H,7,8)/t4-/m0/s1 |
| PubChem CID | 105024 |
| UN Number | UN3283 |
| REACH Code | Y110 |
| HTS Code | 29319000 |
| Tariff Code | 2931900090 |
Safety & GHS
-
Toxic
GHS06
-
Serious Health Hazard
GHS08
-
Hazardous to the Environment
GHS09
Hazard statements
- H301 Toxic if swallowed
- H331 Toxic if inhaled
- H373 May cause damage to organs through prolonged or repeated exposure
- H400 Very toxic to aquatic life
- H410 Very toxic to aquatic life with long lasting effects
Precautionary statements
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P273 Avoid release to the environment
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P284 Wear respiratory protection
- P301+310 IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician
- P304+312 IF INHALED: Call a POISON CENTER or doctor/physician if you feel unwell
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-(methylseleno)butanoic acid
- (2S)-2-amino-4-methylselanylbutanoic acid
- (2S)-2-azaniumyl-4-methylselanylbutanoate
- (S)-2-Amino-4-(methylselanyl)butanoic acid
- (S)-2-Amino-4-(methylseleno)butanoic acid
- L-Selenomethioninum
- Selenium-L-methionine
- Seleno-L-methionine
- Selenomethionine-L
- SeMet
Frequently asked questions
What is L-(+)-Selenomethionine used for?
It is used as a selenium source in nutritional supplements and research applications, particularly in studies involving selenium metabolism and antioxidant activity.
What is the chemical formula and molecular weight of L-(+)-Selenomethionine?
The formula is C5H11NO2Se with a molecular weight of 196.11 g/mol.
How should L-(+)-Selenomethionine be stored?
It must be stored at temperatures between -15 and -20 °C to maintain stability and prevent degradation.
What grade of L-(+)-Selenomethionine is available?
We supply L-(+)-Selenomethionine in research grade, suitable for laboratory and scientific use.
Can Molekula supply L-(+)-Selenomethionine in bulk?
Yes, we can supply L-(+)-Selenomethionine in bulk quantities—please contact our sales team for pricing and availability.
What documentation comes with an order of L-(+)-Selenomethionine?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS), compliant with regulatory standards.
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.