|
L-Threonine
|
 |
|
C4H9NO3
119.1 |
72-19-5 |
| DEFINITION |
|
Threonine contains not less
than 99.0 per cent and not more than the equivalent of 101.0
per cent of (2S,
3R)-2-Amino-3-hydroxybutyric acid, calculated with reference to the dried substance.
|
|
CHARACTERS
|
|
A white, crystalline powder
or colourless crystals, soluble in water, practically
insoluble in alcohol and in ether.
|
| IDENTIFICATION |
| Infrared absorption
spectrophotometry |
| TESTS |
| Appearance
of solution |
Clear and
meets the requirements |
|
pH |
5.0 to 6.5 |
|
Specific
optical rotation |
27.6º to -29.0º |
| Ninhydrin-positive
substances |
Meets the requirements |
| Chlorides |
Limit: 200 ppm |
| Sulphates |
Limit: 300 ppm |
| Ammonium |
Limit:200 ppm |
| Iron |
Limit:10 ppm |
| Heavy
metals |
Limit:10 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 in a well-closed
container, protected from light. |
