L(-)-Cystine, meets analytical specification of Ph.Eur.

Supplier: Thermo Scientific

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

406160010 406160250 406161000
ACRO406160010EA 927 GBP
ACRO406160010 ACRO406160250 ACRO406161000
L(-)-Cystine, meets analytical specification of Ph.Eur.
L(-)-Cystine
Formula: HOOCCH(NH₂)CH₂SSCH₂CH(NH₂)COOH
MW: 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
MDL Number: MFCD00064228
CAS Number: 56-89-3

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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

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