CAS NO: 56-89-3

Specification: EP5

Product Name L-Cystine
Quality Standard EP5


Testing Items Critrion
Appearance A white, crystalline powder
State of solution Clear and not more intensely coloured than reference solution Y7
Specific rotation -218~-224°
Ninhydrin-positive substances Not more intense than the spot in the chromatogram obtained with reference solution  (0.2%)
Chloride(Cl) ≤200ppm
Sulphates ≤300ppm
Ammonium(NH4) ≤200ppm
Iron(Fe) ≤10ppm
Heavy metals(Pb) ≤10ppm
Loss on drying ≤0.50%
Sulphated ash ≤0.10%
Assay 98.5~101.0%


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