L-Cysteine CAS:52-90-4

L-Cysteine CAS:52-90-4 Basic information

Product Name:	L-Cysteine
Synonyms:	L-Alanine, 3-mercapto-;L-Amino-thopro-ponicacid;L-Mercaptoalanine;NSC-8746;Propanoic Acid, 2-amino-3-mercapto-, (R)-;Thioserine;cysteine,b-mercapto-alanine;L-CYSTEINE FREE BASE, BIOTECHNOLOGY &
CAS:	52-90-4
MF:	C3H7NO2S
MW:	121.16
EINECS:	200-158-2
Product Categories:	API intermediates;Cysteine [Cys, C];Amino Acids;Amino Acids and Derivatives;alpha-Amino Acids;Antioxidant;Biochemistry;Nutritional Supplements;L-Amino Acids;Amino Acids;amino
Mol File:	52-90-4.mol

L-Cysteine CAS:52-90-4 Chemical Properties

density:	1.197 (estimate)
Melting point:	220 °C (dec.)(lit.)
Boiling point:	293.9±35.0 °C(Predicted)
form:	Solid
storage temp.:	Store at RT.
Water Solubility:	280 g/L (25 ºC)
refractive index:	8.8 ° (C=8, 1mol/L HCl)
pka:	1.92(at 25℃)
BRN:	1721408
solubility:	H2O: 25 mg/mL
NIST Chemistry Reference:	L-Cysteine(52-90-4)
Merck:	14,2781
Stability:	Stability Stable, but may be air sensitive. Incompatible with oxidizing agents, bases.
Sensitive:	Air Sensitive
PH:	8.75 º (c=12, 2N HCl)
alpha:	8.75 º (c=12, 2N HCl)
FEMA:	3263 \| L-CYSTEINE
JECFA Number:	1419
λmax:	λ: 260 nm Amax: 1.5λ: 280 nm Amax: 0.2
CAS DataBase Reference:	52-90-4(CAS DataBase Reference)
EPA Substance Registry System:	L-Cysteine (52-90-4)

Item	Standard	Result
Appearance	Colorless to light yellow clear liquid	Colorless liquid
Assay	99-101%	99.34%
PH	4.5-5.5	4.8
Specific Rotation （α）D20	+8.3°~ +9.5°	+8.8°
Transmittance T430	≥98.0%	98.8%
Chloride(CI)	≤0.1%	＜0.1%
Ammonium(NH4)	≤0.02%	＜0.02%
Sulfate(SO4)	≤0.02%	＜0.02%
Iron (Fe)	≤10ppm	＜10ppm
Heavy Metals(Pb)	≤10ppm	＜10ppm
Arsenic A_B2_O3	≤1ppm	＜1ppm
Loss on drying	≤0.50%	0.24%
Residue on Ignition	≤0.1%	0.04%
Conclusion	Qualified

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
Product Categories:	Amino Acids;API intermediates;Cysteine [Cys, C];Amino Acids;Amino Acids and Derivatives;alpha-Amino Acids;Antioxidant;Biochemistry;Nutritional Supplements;L-Amino Acids;amino
Mol File:	52-90-4.mol

L-Cysteine Chemical Properties

Melting point	220 °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)

Safety Information