L-Cysteine CAS NO.52-90-4

L-Cysteine Chemical Properties
Melting point     240 °C (dec.) (lit.)
alpha     8.75 º (c=12, 2N HCl)
Boiling point     293.9±35.0 °C(Predicted)
density     1.197 (estimate)
FEMA     3263 | L-CYSTEINE
refractive index     8.8 ° (C=8, 1mol/L HCl)
storage temp.     Store at RT.
solubility     H2O: 25 mg/mL
pka    1.92(at 25℃)
form     Solid
color     White
PH    4.5-5.5 (100g/l, H2O, 20℃)
optical activity    Optical rotation: +8° to +9° (c = 5, 1 N HCl, 20°C).
Water Solubility     280 g/L (25 ºC)
λmax    λ: 260 nm Amax: 1.5
λ: 280 nm Amax: 0.2
Sensitive     Air Sensitive
Merck     14,2781
JECFA Number    1419
BRN     1721408
Stability:    Stability Stable, but may be air sensitive. Incompatible with oxidizing agents, bases.
CAS DataBase Reference    52-90-4(CAS DataBase Reference)
NIST Chemistry Reference    L-Cysteine(52-90-4)
EPA Substance Registry System    L-Cysteine (52-90-4)             

L-Cysteine Basic information
description Chemical properties Amino acids health benefits Uses Cysteine Metabolism Production methods synthesis physiological effects
Product Name:    L-Cysteine
Synonyms:    (R)-2-Amino-3-mercaptopropanoic acid;3-mercapto-l-alanin;alpha-amino-beta-mercaptopropionicacid;alpha-Amino-beta-thiolpropionic acid;alpha-amino-beta-thiolpropionicacid;Cystein;half-cysteine;L-Cysteine - animal origin
CAS:    52-90-4
MF:    C3H7NO2S
MW:    121.16
EINECS:    200-158-2
Mol File:    52-90-4.mol

Safety Information
Hazard Codes     Xn,Xi
Risk Statements     22-36/37/38-20/21/22
Safety Statements     36-37/39-26-24/25
WGK Germany     3
RTECS     HA1600000
F     10-23
Autoignition Temperature    420 °C
TSCA     Yes
HS Code     29309012
Hazardous Substances Data    52-90-4(Hazardous Substances Data)
Toxicity    LD50 orally in Rabbit: 1890 mg/kg