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DL-Methionine
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DL-Methionine |
 |
|
C5H11NO2S: 149.21 |
|
CAS No.59-51-8 |
Nitrogen: 9.39% |
| DL-Methionine, when dried, contains not less than 99.0 percent and not
more than101.0 percent of DL-Methionine (C5H11NO2S). |
| Description: |
White crystals or crystalline powder; sweet and slightly bitter taste.Solubility (H2O, g/100g):
3.00(20˚C), 4.82(40˚C), 7.55(60˚C), |
|
Identification:
|
Compare the infrared absorption spectrum of the sample with that of the
standard by potassium bromide disc method.
|
| Specifications: |
| Item |
Limit |
|
State of solution
(Transmittance) |
Clear
and colorless
Not less than 98.0% |
| Chloride (Cl) |
Not more than 0.02% |
| Ammonium (NH4) |
Not more than 0.02% |
| Sulfate (SO4) |
Not more than 0.020% |
| Iron (Fe |
Not more than 10PPm |
| Heavy metals (Pb) |
Not more than 10PPm |
| Arsenic (As2O3) |
Not more than 1PPm |
| Other amino acids |
conforms |
| Loss on drying |
8.50 to 12.00% |
|
Residue on ignition
(Sulfated) |
Not more than 0.10% |
| Assay |
99.0 to 101.0% |
| PH |
5.6 to 6.1 |
☆☆☆
Recommended storage limit and condition: Preserved in tight
containers at controlled room temperature (2 year). |
