|
DL-Methionine
|
 |
|
C5H11NO2S
149.2 |
59-51-8 |
| DEFINITION |
|
DL-Methionine contains not
less than 99.0 per cent and not more than the equivalent of
101.0 per cent of (RS)-2- amin-4-(methlthio)
butyric acid, calculated with reference to the dried substance.
|
|
CHARACTERS
|
|
Almost white, crystalline
powder or small flakes, sparingly soluble in water, very
slightly soluble in alcohol, practically insoluble in ether.
It dissolves in dilute mineral acids and in dilute solutions
of alkali hydroxides.
|
| IDENTIFICATION |
| Infrared absorption
spectrophotometry |
| TESTS |
| Appearance
of solution |
Clear and
meets the requirements |
|
pH |
5.4 to 6.1 |
| Related
substances |
Meets the requirements |
| Chlorides |
Limit: 200 ppm |
| Sulphates |
Limit: 200 ppm |
| Heavy
metals |
Limit:20 ppm |
| Loss
on drying |
Not more than 0.5 per
cent |
| Sulphated
ash |
Not more than 0.1 per
cent |
|
ASSAY |
99.0 per cent to 101.0 per
cent |
| STORAGE |
| Store protected from light. |
