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 AB2O3 | ≤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 |
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 |