Quaternary Salts
& Surface Active Agent Series
Fine Chemicals
& Pharmaceutical Intermediates
Tel1:0086-21-20255798
Tel2:0086-21-20252853
Info@richchemical.com
William@richchemical.com
Products > Fine Chemicals & Pharmaceutical Intermediates
L-Cysteine base
| Description: | L-Cysteine base |
| CAS NO.: | 52-90-4 |
| Add time: | 2008-1-4 8:48:15 |
L-Cysteine Base |
|
Item |
Specification |
Appearance |
White crystals or crystalline powder |
Specific Rotation[α]D20 |
+8.3° to +9.5° |
State of solution |
Clear and colorless |
Not less than 95.0% |
|
Chloride (Cl) |
Not more than 0.04% |
Ammonium (NH4) |
Not more than 0.02% |
Sulfate (SO4) |
Not more than 0.030% |
Iron (Fe) |
Not more than 10ppm |
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 0.5% |
Residue on ignition |
Not more than 0.1% |
Assay |
98.0% to 101.0% |
pH |
4.5 to 5.5 |