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L-Cystine
| Description: | L-Cystine |
| CAS NO.: | 56-89-3 |
| Add time: | 2008-1-3 15:34:51 |
L-Cystine |
|
Item |
Specification |
Appearance |
White crystals or crystalline powder |
Specific Rotation[α]D20 |
-215° to -225° |
State of solution |
Clear and colorless |
Not less than 98.0% |
|
Chloride (Cl) |
Not more than 0.020% |
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 |
Aresenic (As2O3) |
Not more than 1ppm |
Other amino aicds |
Chromatographically not detectable |
Loss on drying |
Not more than 0.20% |
Residue on ignition |
Not more than 0.10% |
Assay |
98.5% to 101.0% |
pH |
5.0 to 6.5 |