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S-Carboxymethyl-L-cysteine
Description:
Name:S-Carboxymethyl-L-cysteine
Molecular Formula:C5H9NO4S
Molecular Weight:179.19
CAS:2387-59-9
Standard: EP5
Items | Specification (EP4) | Specification (AJI92) | Specification (BP98) |
Description | White crystals or crystalline powder | ||
Identification | Infrared absorption spectrum | A; B; C; | |
Specific rotation | -3 2 .5 ° - -35.5 ° | -33.5 ° - -36.5 ° | -3 2 .5 ° - 35.5 |
State of solution (Transmittance) | Clear and colorless | ≥ 98.0% | Clear and colorless |
Chloride(Cl) | ≤ 0. 15 | ≤ 0.04% | ≤ 0.15 |
Ammonium(NH4) | - - - - | ≤ 0.02% | - - - - |
Sulfate(SO4) | ≤ 0. 03 | ≤ 0.0 2 % | ≤ 0. 03 |
Iron(Fe) | - - - - | ≤ 30PPm | - - - - |
Heavy metals(Pb) | 0.001% | ≤ 10PPm | 0.001% |
Arsenic(As2O3) | - - - - | ≤ 1PPm | - - - - |
Other amino acids | - - - - | Conforms | - - - - |
Loss on drying | ≤ 0.5 % | ≤ 0. 30 % | ≤ 0.5 % |
Residue on ignition (Sulfated) | ≤ 0. 3 % | ≤ 0. 1 % | ≤ 0. 3 % |
PH | 2.0-3.0 | 2.0-3.5 | 2. 8-3.0 |
Assay | 98. 5-10 1 .0% | 98.5-101.0% | 98.5-101.0% |
L-cystine L-Cysteine | ≤ 0.5 % | - - - - | Ninhydrin-positive substances: ≤ 0.5 % |
White crystals or crystalline powder; slightly acid taste. Very soluble in water, practically insoluble in ethanol and in glacial acetic acid and in ether. Dissolve in dilute hydrochloric acid and in sodium hydroxide T.S,can be used in the curing of chronic tracheitis, emphysema, pulmonary.
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