DL-Methionine
Structure Formula: CH3SCH2CH2CH(NH2)COH
Molecular Formula: C5H11NO2S
Molecular Weight: 149.21
Cas No: 59-51-8
Characteristics: White flake crystal powders, have a special smell, bulk density 1.34g/cm 3 , melting at 281ºC, It's soluble in water, slightly soluble in alcohol, belongs of sulfur amino acid and non-toxic.
Quality Standards: EP4, FCCIV , USP24,
| Items | EP 4 | FCC IV | USP24 |
| Appearance | White flake crystal powders | White flake crystal powders | White crystal or crystalline powder |
| Assay (on dry matter) | 99%~101% | 98.5%-101.5% | 99.0-101.5% |
| Specific rotation | -0.05°- +0.05° | - -- | --- |
| Loss on drying | 0.5% Max | 0.5% Max | ≤ 0.3% |
| Residue on ignition | 0.1% Max | 0.1% Max | ≤ 0.4% |
| Chlorides | 200ppm Max | - -- | ≤ 0.05% |
| Sulphates | 200ppm Max | - -- | ≤ 0.03% |
| Arsenic | - -- | 1.5 ppm Max | --- |
| Heavy metals | 20ppm Max | 20ppm Max | ≤ 0.0015% |
| Iron(Fe) | --- | --- | ≤ 0.003% |
| Organic volatile impurities | --- | --- | Conforms |
Packaging and Storage: In 25kgs f iber drum double
polyethylene bags inside or In 25kgs kraft paper bags Preserve in
well-closed containers, at controlled room temperature.
Recommended limit: 1 year.
