L-Methionine
Chemical
Name: 2-amino-4-(methylthio)-butyric
acid
Molecular Formula: C5N11NO2S
Molecular Weight: 149.1
Cas No: 63-68-3
Characteristics: White crystals or crystalline powder
Quality Standards: USP24, FCCIV, AJI92
| Item | Specifications | ||
| AJI92 | USP24 | FCC IV | |
| Description | White crystals or crystalline powder | Colorless or white lustrous plates, or a white crystalline powder, it has slight, characteristic odor. | |
| Identification | Infrared absorption spectrum | ||
| Specific rotation | +23.0 ° - +24.0 ° | +22.4- +24.7 | +21.0- +25.0 ° |
| State of solution (Transmittance) |
≥ 98.0% | --- | Soluble in water, alkali solutions and in dilute mineral acids |
| Chloride(CL) | ≤ 0.020% | ≤ 0.05% | --- |
| Sulfate(SO4) | ≤ 0.020% | ≤ 0.03% | --- |
| Ammonium(NH4) | ≤ 0.02% | --- | |
| Heavy metals(Pb) | ≤ 10PPm | ≤ 0.0015% | ≤ 10ppm |
| Lead | --- | --- | ≤ 10mg/kg |
| Iron(Fe) | ≤ 10PPm | ≤ 0.003% | --- |
| Arsenic(As2O3) | ≤ 1PPm | --- | --- |
| Other amino acids | Conforms | --- | --- |
| Loss on drying | ≤ 0.20% | ≤ 0.30% | ≤ 0.5% |
| Residue on ignition (sulfated) | ≤ 0.10% | ≤ 0.40% | ≤ 0.1% |
| Assay | 99.0 ～ 101.0% | 98.5-101.5% | 98.5-101.5% |
| PH | 5.6-6.1 | 5.6-6.1 | --- |
| O.V.I | --- | Meet the requirements | --- |
Packaging and Storage: In 25kgs fiber drum double
polyethylene bags inside; Preserve in well-closed containers, at
controlled room temperature.
Recommended limit: 1 year.
