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

Supplier: MERCK PRODUCTION CHEMICALS

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

1.02836.1000 1.02836.9029
1.02836.1000EA 698 GBP
1.02836.1000 1.02836.9029
L(-)-Cystine 98.5-101.5% (dried basis) FCC for biopharmaceutical production, SAFC®
L(-)-Cystine
Formula: HOOCCH(NH₂)CH₂SSCH₂CH(NH₂)COOH
MW: 240,3 g/mol
Boiling Pt: 428 °C (1013 hPa)
Melting Pt: 261…262 °C (dec.)
Density: 1,677 g/cm³ (20 °C)
Storage Temperature: Ambient
MDL Number: MFCD00064228
CAS Number: 56-89-3
EINECS: 200-296-3
Merck Index: 13,02811

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Specification Test Results

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 %

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