L-Cystine

  • L-(-)-3,3'-Dithiobis (2-aminopropionic acid)
Formula
C6H12N2O4S2
Structure
Description
White powder.

Registry Numbers and Inventories.
CAS
56-89-3
EC (EINECS/ELINCS)
200-296-3
RTECS
HA2690000
RTECS class
Drug
Merck
13,2811
Beilstein/Gmelin
1728094
Beilstein Reference
4-04-00-03155
Swiss Giftliste 1
G-7988
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C6H12N2O4S2
Formula mass
240.30
Melting point, °C
261 - 262
Boiling point, °C
428
Density
1.677 g/cm3
Solubility in water
110 mg/L
Partition coefficient, pKow
-1.38

Hazards and Protection.
Storage
Store in a cool, dry, well-ventilated area away from incompatible substances.
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Minimize dust generation and accumulation. Avoid contact with skin and eyes. Avoid ingestion and inhalation.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks
Sweep up, then place into a suitable container for disposal.
Disposal code
31
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Strong oxidizers.
Decomposition
Nitrogen oxides, carbon monoxide, oxides of sulfur, carbon dioxide.

Fire.
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Dusts at sufficient concentrations can form explosive mixtures with air. Extinguishing media: Use water spray, dry chemical, or carbon dioxide.

Health.
Poison_Class
4
Exposure effects
   Ingestion
Low hazard for usual industrial handling.
   Inhalation
Low hazard for usual industrial handling.
   Skin
Low hazard for usual industrial handling.
   Eyes
Contact may cause transient eye irritation.

First aid
 
   Ingestion
If victim is conscious and alert, give 2-4 cupfuls of milk or water. Get medical aid.
   Inhalation
Remove from exposure to fresh air immediately. Get medical aid if cough or other symptoms appear.
   Skin
Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Get medical aid if irritation develops or persists.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. If irritation develops, get medical aid.

Transport.
HS Code
2930 90 14