L-Cysteine CAS:52-90-4

  • Product Name:L-Cysteine
  • CAS:52-90-4
  • Molecular formula:C3H7NO2S
  • Assay:99%+
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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 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 Structure

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
pka1.92(at 25℃)
form Solid
color White
PH4.5-5.5 (100g/l, H2O, 20℃)
optical activityOptical rotation: +8° to +9° (c = 5, 1 N HCl, 20°C).
Water Solubility 280 g/L (25 ºC)
λmaxλ: 260 nm Amax: 1.5
λ: 280 nm Amax: 0.2
Sensitive Air Sensitive
Merck 14,2781
JECFA Number1419
BRN 1721408
Stability:Stability Stable, but may be air sensitive. Incompatible with oxidizing agents, bases.
CAS DataBase Reference52-90-4(CAS DataBase Reference)
NIST Chemistry ReferenceL-Cysteine(52-90-4)
EPA Substance Registry SystemL-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
10-23
Autoignition Temperature420 °C
TSCA Yes
HS Code 29309012
Hazardous Substances Data52-90-4(Hazardous Substances Data)
ToxicityLD50 orally in Rabbit: 1890 mg/kg


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