L-Cysteine
CAS No.: 52-90-4
Molecule Formula: C3H7NO2S
Molecule Weight: 121.16
Structure Formula:
Description:white crystal or white powdery .
Manufacture Standards:USP, AJI
Specification:
|
Test items |
Specification (AJI) |
Specification (USP25) |
|
Appearance |
white crystal or white powdery |
|
|
Identification |
tested by Infrared absorption spectrometer |
|
|
Specific rotation |
+8.3°- +9.5° |
--- |
|
Solubility |
≥ 95.0% |
--- |
|
Chlorine content |
≤ 0.04% |
--- |
|
Ammonium salt (NH4 ) |
≤ 0.02% |
--- |
|
Sulfate radical (SO4 ) |
≤ 0.030% |
--- |
|
Ferric salt (Fe) |
≤ 10PPm |
--- |
|
Heavy metal (Pb) |
≤ 10PPm |
--- |
|
Arsenic salt (As2O3) |
≤ 1PPm |
--- |
|
Other amino acids |
conforms |
--- |
|
Loss on drying |
≤ 0.5% |
--- |
|
Residue on Ignition (sulfated) |
≤ 0.1% |
--- |
|
Assay |
98.0-101.0% |
--- |
|
pH |
4.5-5.5 |
--- |
|
Organic volatile matter And organic impurities |
--- |
--- |
Packaging and storage: 25kg/drum, lined with double-layer film bag; Stored in a sealed container, and kept at room temperature.
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