|
|
| |
|
 Products
L-Cystine
| Test Items |
Standard |
Description |
white crystals or crystalline powder |
Identification |
infrared absorption spectrum |
Specific rotation [α]20D |
-215 to -225° |
State of solution
(Transmittance) |
clear and colorless
not less than 98.0% |
Chloride(CI) |
not more than 0.040% |
Ammonium(NH4) |
not more than 0.02% |
Sulfate (SO4) |
not more than 0.020% |
Iron (Fe) |
not more than 20ppm |
Heavy metals (Pb) |
not more than 10ppm |
Arsenic (As2O3) |
not more than 1ppm |
Other amino acids |
conforms |
Loss on drying |
not more than 0.20% |
Residue on ignition
(sulfated) |
not more than 0.10% |
Assay |
98.5 to 101.0% |
PH |
5.0 to 6.5 |
Pyrogen |
nonpyrogenic |
|
| |
|
