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L-Cystine Structure

L-Cystine

Chemical Properties

Melting point >240 °C (dec.) (lit.)
Boiling point 468.2±45.0 °C(Predicted)
alpha  -224 º(c=2 in 1M HCl)
Density  1.68
refractive index  -222.5 ° (C=1, 1mol/L HCl)
storage temp.  2-8°C
solubility  1 M HCl: 100 mg/mL
form  Powder/Solid
pka 1.0, 2.1, 8.02, 8.71(at 25℃)
color  White
optical activity [α]20/D 219±5°, c = 1% in 1 M HCl
Water Solubility  0.112 g/L (25 ºC)
Merck  14,2782
BRN  1728094
Stability Stable. Incompatible with strong oxidizing agents.
InChIKey LEVWYRKDKASIDU-IMJSIDKUSA-N
LogP 0.773 (est)
CAS DataBase Reference 56-89-3(CAS DataBase Reference)
Substances Added to Food (formerly EAFUS) L-CYSTINE
FDA 21 CFR 172.320
FDA UNII 48TCX9A1VT
NIST Chemistry Reference L-Cystine(56-89-3)
EPA Substance Registry System L-Cystine (56-89-3)

Safety

Symbol(GHS)
Signal wordWarning
Hazard statements H315-H319-H335
Precautionary statements P261-P271-P280
Hazard Codes  Xi,Xn
Risk Statements  36/37/38-22
Safety Statements  26-36-24/25
RIDADR  2811
WGK Germany  3
RTECS  HA2690000
Hazard Note  Irritant
TSCA  Yes
PackingGroup  III
HS Code  29309014
NFPA 704:
1
2 0

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