L-Cysteine
Free Base 
Chemical
Name:
(+)-2-Amino-3-mercaptopropionic acid
Molecular Formula: C3H7NO2S
Molecular Weight: 121.15
Cas No: [52-90-4]
Characteristics: White crystalline powder; tasteless,
easily soluble in water but insoluble in alcohol and ether
Quality Standards: AJI92
|
Item |
Specifications (AJI92) |
|
Description |
White crystals or crystalline powder |
|
Identification |
Meets the requirements |
|
Specific rotation [a]D20° |
+8.3 °- +9.5° |
|
State of solution |
≥ 95.0% |
|
Chloride (Cl) |
≤ 0.04% |
|
Ammonium (NH4) |
≤ 0.02% |
|
Sulfate (SO4) |
≤ 0.030% |
|
Iron (Fe) |
≤ 10PPm |
|
Heavy metals (Pb) |
≤ 10PPm |
|
Arsenic (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 |
Packaging and
Storage: In 25kgs fiber
drum double polyethylene bags inside; Preserve in well-closed containers,
at controlled room temperature.
Recommended limit: 1 year.
