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LC1781 L-Cystine suitable for use as excipient exp Ph Eur Order number Packaging Quantity Price AC28781 Plastic bottle 1 kg Inquire AC28781 Plastic drum 10 kg Inquire Product information Grade Ph Eur Hill Formula C6H12N2O4S2 HS Code 2930 90 13 EC number 200-296-3 Molar mass 240.29 g/mol CAS number 56-89-3 Chemical and physical data Ignition temperature 400 C Solubility (20 C) insoluble Melting point 261 - 262 C (decomposition) Molar mass 240.29 g/mol Density 1.677 g/cm3 (20 C) Bulk density 300 kg/m3 pH value >1 (H2O, 20 C) Safety information RTECS HA2690000 Storage class 10 - 13 Other liquids and solids WGK NWG not water endangering Specifications Assay(bromatometric, calculated on dried substance) 98.5 - 101.0% Identity(IR-spectrum) passes test Appearance white to almost white, fine powder Appearance of solution(100g/l, hydrochloricacid 2mol/l) clear and not more intense in color than reference solution Y7 Spec. rotation( 20/D, 20g/l, hydrochloric acid1mol/l, calc. on dried substance) -218 to -224 Chloride (Cl) 0.02% Sulfate (SO4) 0.03% Heavy metals(as Pb) 0.001% Fe (Iron) 0.001% NH4 (Ammonium) 0.02% Ninhydrin - positive substances(TLC) 0.2% Ninhydrin - positive substances (LC)(largest single impurity) 0.2% Residual solvents (Ph.Eur./ICH) excluded by manufacturing process Sulfated ash(600C) 0.1% Loss on drying(105C) 0.5%