L-Methionine sulfoxide
Also known as: H-Met(O)-OH, L-methionine S-oxide, (2S)-2-amino-4-(methylsulfinyl)butanoic acid, L-2-Amino-4-(methylsulfinyl)butanoic acid, METHIONINE(O)-OH, L-METHIONINE SULPHOXIDE, MFCD00063093, UNII:O74B4F6OYL, UNII:XN1XVI4B2C
L-Methionine sulfoxide (CAS 3226-65-1) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C5H11NO3S and a molecular weight of 165.211 g/mol. Key properties include a melting point of 234-235ºC, a boiling point of 434.3±40.0 °C at 760 mmHg, a density of 1.4±0.1 g/cm3 and a flash point of 216.4±27.3 °C. It is classified under GHS with signal word Warning and hazard statements H319 — Causes serious eye irritation. It is listed by 2 suppliers, 1 of which publish reference prices, from 8.02 to 7,280.00 CNY. Record last updated Aug 21, 2026.
- CAS No.
- 3226-65-1
- Jingsj CID
- J-1970637-3
- Molecular Formula
- C5H11NO3S
- Molecular Weight
- 165.211 g/mol
- Category
- Organic Acids
- Last updated
- 8/21/2026
| Supplier | Purity / Pack | Base Price | Unit Price | Origin | |
|---|---|---|---|---|---|
In Stock | 98% 500g | ¥4,009.00 | $1.2 /gBest ¥8.02/g CNY | CN China MOQ 500g | |
In Stock | 98% 100g | ¥960.00 | $1.44 /g ¥9.60/g CNY | CN China MOQ 100g | |
In Stock | 98% 25g | ¥278.00 | $1.66 /g ¥11.12/g CNY | CN China MOQ 25g |
Physicochemical Properties
| Melting Point | 234-235ºC |
|---|---|
| Boiling Point | 434.3±40.0 °C at 760 mmHg |
| Density | 1.4±0.1 g/cm3 |
| Flash Point | 216.4±27.3 °C |
| Exact Mass | 165.045959 |
| PSA | 99.60000 |
| LogP | -1.62 |
| Vapor Pressure | 0.0±2.2 mmHg at 25°C |
| Refractive Index | 1.570 |
| Storage Conditions | 2-8°C |
| Stability | Temperature Sensitive, Hygroscopic |
GHS Safety & Compliance
- H319 — Causes serious eye irritation
Activity & Biological Data
| Additional Information | [1]. Dos Santos LM, et al. Methionine and methionine sulfoxide treatment induces M1/classical macrophage polarization and modulates oxidative stress and purinergic signaling parameters. Mol Cell Biochem. 2017 Jan;424(1-2):69-78. |
|---|
Customs & Trade Information
| HS Code | 2930909090 |
|---|---|
| Summary | 2930909090. other organo-sulphur compounds. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:30.0% |
Frequently Asked Questions
What is the CAS number of L-Methionine sulfoxide?
The CAS number of L-Methionine sulfoxide is 3226-65-1.
What are the molecular formula and molecular weight of L-Methionine sulfoxide?
L-Methionine sulfoxide has molecular formula C5H11NO3S and molecular weight 165.211 g/mol.
Which suppliers offer L-Methionine sulfoxide?
2 supplier(s) listed; reference unit price ¥8.02–7280.00 /g.
Is L-Methionine sulfoxide hazardous?
L-Methionine sulfoxide has GHS signal word Warning and hazard statements H319 — Causes serious eye irritation.
What are the upstream and downstream products of L-Methionine sulfoxide?
For L-Methionine sulfoxide, Upstream Products: DL-Methionine, L-Methionine; Downstream Products: L(+)-2-Aminobutyric acid, L-Aspartic acid, L-Methionine sulfone.
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-Methionine sulfoxide (CAS 3226-65-1)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1970637-3 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.