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L-Cystine

Molecular Formula: C6H12N2O4S2

Molecular Weight: 240.3

CAS No: 56-89-3

L-CystineEP11USP2023AJI92FCC11
Assay98.5-101.0%98.5-101.5%98.5-101.0%98.5-101.5%
PH//5.0-6.5/
Specific rotation[a]D20-218°--224°-215°--225°-215°--225°-215°--225°
Specific rotation[a]D25////
Transmittance(T430)//≥98.0%/
Appearance of solutionclear & colorless≤Y7///
Chloride(Cl)≤0.02%≤0.02%≤0.02%/
Ammonium(NH4)≤0.02%/≤0.02%/
Sulfate(SO4)≤0.03%≤0.02%≤0.02%/
Iron(Fe)≤10PPM≤10PPM≤20PPM/
Heavy metals(Pb)//≤10PPM≤5PPM
Arsenic//≤1PPm/
Other amino acids/

Individual impurities≤0.2%

Total impurities≤2.0%

conform/
Ninhydrin-positive substancesEach impurity≤0.2%
Total impurities≤0.5%
///
Loss on drying≤0.50%≤0.20%≤0.20%≤0.20%
Residue on ignition≤0.10%≤0.10%≤0.10%≤0.10%
Total plate count≤ 1000 CFU/g≤ 1000 CFU/g≤ 1000 CFU/g≤ 1000 CFU/g
Moulds & Yeasts≤ 100 CFU/g≤ 100 CFU/g≤ 100 CFU/g≤ 100 CFU/g