L-Cystine 产品信息 Form White crystals or crystalline powder Molar mass 240.3 Purity ≥98% by Assay (Macro-Kjeldahl Method) Contaminants Heavy metals: ≤10 ppm; sulfate: ≤0.02%; arsenic: ≤1 ppm; chloride: ≤0.02%; ammonium: ≤0.02% Heavy metals ≤10 ppm Optical rotation Optical rotation: -218° to -224°(c = 2, 1 N HCl, 20°C) pH value 5.0 - 6.5 (1.0 g in 100 ml H2O) Solubility H2O Chemical formula C6H12N2O4S2 RTECS HA2690000 CAS number 56-89-3 Merck USA index 14, 2782 商店和运输信息 Storage +15°C to +30°C Ship Ambient Temperature Only Standard Handling