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. |
