English name: L-Cysteine
CAS number: 52-90-4
Molecular formula: C3H7NO2S
Molecular weight: 121.16
EINECS number: 200-158-2
MDL No.:MFCD00064306
attribute
Melting point 240 ° C (dec.) (lit.)
Specific rotation 8.75 º (c=12,2N HCl)
Boiling point 293.9 ± 35.0 ° C (Predicted)
Density 1.197 (estimate)
FEMA3263 | L-CYSTEINE
Refractive index 8.8 ° (C=8,1mol/L HCl)
Storage conditions Store below+30 ° C
Solubility H2O: 25 mg/mL
Acidity coefficient (pKa) 1.92 (at 25 ℃)
Form Solid
Color White
PH value 4.5-5.5 (100g/l, H2O, 20 ℃)
Odor sulfur
Fragrant sulfur
Optical activity:+8 ° to+9 ° (c=5,1 N HCl, 20 ° C)
Water solubility 280 g/L (25 º C)
Sensitivity Air Sensitive
Maximum wavelength (λ max): 260 nm Amax: 1.5
λ: 280 nm Amax: 0.2
JECFA Number1419
Merck14,2781
BRN1721408
Stability Stability, but may be air sensitive. Incompatible with oxidizing agents, bases.
LogP-2.49