L-Selenomethionine
Also known as: (S)-(+)-2-Amino-4-(methylseleno)butanoic acid, (S)-2-Amino-4-(methylseleno)butyric acid, (2S)-2-amino-4-(methylselanyl)butanoic acid, (2S)-2-amino-4-(methylseleno)butanoic acid, L-(+)-Selenomethionine, Seleno-L-methionine, SeMet, Selenium-L-methionine, SEMET, MFCD00037210
L-Selenomethionine (CAS 3211-76-5) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C5H11NO2Se and a molecular weight of 196.106 g/mol. Key properties include a melting point of 265 °C, a boiling point of 320.8±37.0 °C at 760 mmHg and a flash point of 147.8±26.5 °C. It is classified under GHS with signal word Danger and hazard statements H301 — Toxic if swallowed, H331 — Toxic if inhaled and H373 — May cause damage to organs through prolonged exposure. It is listed by 1 supplier, from 816.00 to 860.00 CNY. Record last updated Aug 21, 2026.
- CAS No.
- 3211-76-5
- Jingsj CID
- J-1993139-5
- Molecular Formula
- C5H11NO2Se
- Molecular Weight
- 196.106 g/mol
- Category
- Organic Acids
- Last updated
- 8/21/2026
| Supplier | Purity / Pack | Base Price | Unit Price | Origin | |
|---|---|---|---|---|---|
In Stock | ≥98.0%(T) 5g | ¥4,080.00 | $122.11 /gBest ¥816.00/g CNY | CN China MOQ 5g | |
In Stock | ≥98.0%(T) 1g | ¥860.00 | $128.69 /g ¥860.00/g CNY | CN China MOQ 1g |
Physicochemical Properties
| Melting Point | 265 °C |
|---|---|
| Boiling Point | 320.8±37.0 °C at 760 mmHg |
| Flash Point | 147.8±26.5 °C |
| Exact Mass | 196.995499 |
| PSA | 63.32000 |
| LogP | -0.65 |
| Vapor Pressure | 0.0±1.5 mmHg at 25°C |
| Refractive Index | 18 ° (C=0.5, 2mol/L HCl) |
| Additional Property | soluble |
GHS Safety & Compliance
- H301 — Toxic if swallowed
- H331 — Toxic if inhaled
- H373 — May cause damage to organs through prolonged exposure
- H410 — Very toxic to aquatic life with long lasting effects
Activity & Biological Data
| Target | Human Endogenous Metabolite |
|---|---|
| Additional Information | [1]. Schrauzer GN, et al. Selenomethionine: a review of its nutritional significance, metabolism and toxicity. J Nutr. 2000 Jul;130(7):1653-1656. |
Customs & Trade Information
| HS Code | 2922499990 |
|---|---|
| Summary | HS:2922499990 other amino-acids, other than those containing more than one kind of oxygen function, and their esters; salts thereof VAT:17.0% Tax rebate rate:9.0% Supervision conditions:AB(certificate of inspection for goods inward,certificate of inspection for goods outward) MFN tariff:6.5% General tariff:30.0% |
Frequently Asked Questions
What is the CAS number of L-Selenomethionine?
The CAS number of L-Selenomethionine is 3211-76-5.
What are the molecular formula and molecular weight of L-Selenomethionine?
L-Selenomethionine has molecular formula C5H11NO2Se and molecular weight 196.106 g/mol.
Which suppliers offer L-Selenomethionine?
1 supplier(s) listed; reference unit price ¥816.00–860.00 /g.
Is L-Selenomethionine hazardous?
L-Selenomethionine has GHS signal word Danger and hazard statements H301 — Toxic if swallowed; H331 — Toxic if inhaled; H373 — May cause damage to organs through prolonged exposure.
What are the upstream and downstream products of L-Selenomethionine?
For L-Selenomethionine, Upstream Products: DL-Selenomethionine, iodomethane.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "L-Selenomethionine (CAS 3211-76-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1993139-5 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.