| |
| Test Items |
Standard |
| Description |
Fine
powder, white or light yellow color, odorless |
| Identification |
Conforms |
| Solubility |
Practically
insoluble organic solvents.
Soluble in water. |
| Melting point |
250℃〜265 |
| Heavy metals |
LT
10 ppm |
| PH (2% in water) |
7.9〜8.5 |
| Arsenic |
LT
2 ppm |
| Assay |
No
Less than 99 % calculated as anhydrous product. |
| Specific rotation |
Between
+18 and +25 |
| Water content |
No
More Than 1% |
| Sulphuric ashes |
No
More Than 0.1% |
| TLC |
L-Histidine
free  2%
 -Alanine
free 0.1% |
|
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