L(-)-Cystine, meets analytical specification of Ph.Eur.
Supplier: Thermo Fisher Scientific
Certificates
About this item
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
Boiling Pt:428 °C (1013 hPa)
Melting Pt:260…261 °C
Density:1,677 g/cm³ (20 °C)
Storage Temperature:Ambient
Specifications
- Environmentally Preferable:
Specifications
Specification Test Results
- Appearance:White to almost white Crystalline powder
- Infrared spectrum:Conforms
- Loss on drying:≤0.5 % (1 g, 105°C)
- Sulfated ash:≤0.1 % (1 g)
- Appearance of solution:Clear and not more intensely coloured than reference solution Y7
- Specific optical rotation:-218° to -224° (20°C, 589 nm) (c=2, 1M HCl) (On dried substance)
- Titration:98.5 to 101.0 % (On dried substance)
- Sulfates:≤300 ppm
- Chlorides:≤200 ppm
- Ammonium (NH4):≤200 ppm
- Iron (Fe):≤10 ppm
- Ninhydrin-positive substances:Passes test
Specification Test Results
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