L(-)-Cystine 98.5-101.5% (dried basis) FCC for biopharmaceutical production, SAFC®

Synonyms: (R)-(-)-Cystine, (2R,2'R)-3,3'-Disulphanediylbis(2-aminopropanoic acid), (H-Cys-OH)2

CAS Number:56-89-3

Formula:HOOCCH(NH₂)CH₂SSCH₂CH(NH₂)COOH

MDL Number:MFCD00064228

:240.3 g/mol

Merck Index:13,02811

Boiling Pt:428 °C (1013 hPa)

Melting Pt:261…262 °C (dec.)

Density:1.677 g/cm³ (20 °C)

Storage Temperature:Ambient

EINECS:200-296-3

Specifications

Assay (ex N, calc. on dried substance):
98.5 - 101.5 %
Identity (IR-spectrum):
Passes Test
Appearance:
White to almost white, fine-crystalline powder
Appearance of solution (100 g/l, hydrochloric acid 2 mol/l):
Clear and Colorless
Spec. Rotation (α20/D, 20 g/l, Hydrochloric Acid 1 mol/l, Previously Dried Substance):
–215 to –225
Heavy Metals (as Pb):
≤10 ppm
Pb (Lead):
≤5 ppm
Ninhydrin - Positive Substances (LC) (Largest Single Impurity):
≤0.2 %
Ninhydrin - Positive Substances (LC) (Sum of all Impurities):
≤0.5 %
Sulfated Ash (800 °C):
≤0.1 %
Loss on Drying (105 °C; 3 h):
≤0.2 %