- Product Detail
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L-Cystine AJI97 USP2025 EP11 JP18 Appearance White crystals or crystalline powder / White or almost white, crystalline powder White crystals or crystalline powder ldentification Conform Conform IR:Conform to CRS Spectrum IR: Conform to CRS Spectrum State of solution
(Transmittance)Clear and colorless,
≥98.0%/ / / Specific rotation 
-218° ~ -224° -215º ~ -225º -224° ~ -218° (dried substance) -215° ~ -225° Optical rotation 
/ / / / Chloride ≤0.020% ≤200ppm ≤200ppm ≤0.021% Sulfate ≤0.020% ≤200ppm ≤300ppm ≤0.028% Ammonium ≤0.02% / ≤0.02% ≤0.02% Iron ≤10ppm ≤10ppm ≤10ppm ≤10ppm Heavy metals ≤10ppm / / ≤10ppm Arsenic ≤1ppm / / / Other amino acids Conform / / / Loss on drying ≤0.20% ≤0.2% ≤0.5% ≤0.3% Residue on ignition ≤0.10% ≤0.1% ≤0.1% ≤0.1% pH 5.0 ~ 6.5 / / / Assay 98.5% ~ 101.0% 98.5% ~ 101.5% (on the dried basis) 98.5% ~ 101.0% (dried substance) 99.0% ~ 101.0% Organic impurities/
Related compounds/ Individual impurities: ≤0.2% / Conform Total impurities: ≤2.0% Appearance of solution / / The solution is clear and not more intensely coloured than reference solution Y7 Clear and colorless Ninhydrin-positive
substances/ / Any ninhydrin-positive substance:
each impurity : ≤ 0.2%/ Total: ≤ 0.5%
L-Cystine
CAS No.: 56-89-3
Molecular formular: C6H12N2O4S2
Molecular weight: 240.3
Molecular formular: C6H12N2O4S2
Molecular weight: 240.3
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