L-Cystine
Standard AJI92
Structural formula: C6H12O4N2S2
Speciific rotation [α] 20d: -215°to -225°
Tansmittance: not less than 98%
Ammonium: not more than 0.02%
Chloride (Cl): not more than 0.02%
Sulfate (SO4): not more than 0.02%
Lron (Fe): not more than 10PPM
Heavy metals (Pb): not more than 10PPM
Arsenic (As2O3): not more than 1PPM
Other amino acid: Chromatographically not detectable
Residue on ignition: not more than 0.10%
Loss on drying: not more than 0.20%
Assay: 99-101.0%
PH: 5.0-6.5